BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Jet quenching in evolving anisotropic matter DTSTART;VALUE=DATE-TIME:20221116T110000Z DTEND;VALUE=DATE-TIME:20221116T111500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-168@indico.ift.uam-csic.es DESCRIPTION:Speakers: Andrey Sadofyev (IGFAE)\nOver the last decades\, the theoretical picture of how hadronic jets interact with nuclear matter has been extended to account for the medium’s finite longitudinal length an d expansion. However\, only recently a first-principle approach has been d eveloped that allows to couple the jet evolution to the medium flow and an isotropic structure in the dilute limit. In this talk\, we will show how t o extend this approach to the dense regime\, where the resummation of mult iple in-medium scatterings is necessary. Particularly\, we will consider t he modifications of the single particle momentum broadening distribution a nd single gluon production rate in evolving matter. The resummation is per formed by either computing the opacity series or starting from the all ord er BDMPS-Z formalism. We will also discuss the (novel) resulting modificat ions to jets' substructure.\n\nhttps://indico.ift.uam-csic.es/event/14/con tributions/168/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/168/ END:VEVENT BEGIN:VEVENT SUMMARY:CMS results on Double Parton Scattering DTSTART;VALUE=DATE-TIME:20221114T144500Z DTEND;VALUE=DATE-TIME:20221114T150000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-116@indico.ift.uam-csic.es DESCRIPTION:Speakers: Ankita Mehta (University of Hamburg)\nCMS results on Double Parton Scattering\n\nhttps://indico.ift.uam-csic.es/event/14/contr ibutions/116/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/116/ END:VEVENT BEGIN:VEVENT SUMMARY:Comparison of GS09 and Pythia double PDFs DTSTART;VALUE=DATE-TIME:20221114T153000Z DTEND;VALUE=DATE-TIME:20221114T154800Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-174@indico.ift.uam-csic.es DESCRIPTION:Speakers: Jonathan Gaunt (University of Manchester)\nThe GS09 and Pythia double PDFs (dPDFs) have both been constructed to satisfy (in s ome sense) momentum and valence number constraints. I compare the two sets of dPDFs to each other and to the "naive" dPDFs constructed out of a prod uct of single PDFs\, in the context of their predictions for double Drell- Yan production. I explain the differences between these predictions in ter ms of the procedures used to construct the dPDF sets. Based on arXiv:2208. 08197\n\nhttps://indico.ift.uam-csic.es/event/14/contributions/174/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/174/ END:VEVENT BEGIN:VEVENT SUMMARY:Underlying event measurements at ATLAS DTSTART;VALUE=DATE-TIME:20221114T090000Z DTEND;VALUE=DATE-TIME:20221114T091500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-125@indico.ift.uam-csic.es DESCRIPTION:Speakers: Zvi Citron (Ben-Gurion University of the Negev)\nThi s talk presents ATLAS recent measurements of distributions sensitive to Un derlying event\, the hadronic activity observed in relationship with the h ard scattering in the event using the full ATLAS dataset at center-of-mass energy of 13 TeV. Measurement of charged-particle distributions as a func tion of Upsilon momentum and different Upsilon states will be discussed. T he measurement benefits from the heavy-ion style approach to remove combin atorial and pileup backgrounds leading to increased sensitivity. In additi on\, charged-particle distributions measured in top-antitop events decayin g leptonically will be shown. The measured distributions can constrain mod els of color reconnection mechanism in Monte-Carlo generators.\n\nhttps:// indico.ift.uam-csic.es/event/14/contributions/125/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/125/ END:VEVENT BEGIN:VEVENT SUMMARY:Surfacing Odd Harmonics in Two Particle Correlations within the Co lor Glass Condensate Approach DTSTART;VALUE=DATE-TIME:20221114T163000Z DTEND;VALUE=DATE-TIME:20221114T165000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-126@indico.ift.uam-csic.es DESCRIPTION:Speakers: Víctor Vila (IGFAE / IFJ PAN)\nIn this work\, we co mpute the double-inclusive gluon production cross-section within the frame work of the dense-dilute Color Glass Condensate (CGC) approach. As a novel ty\, we provide the contribution accounting for the quantum correction in which the two gluons come from a single projectile source\, thus giving re newed insights about a breaking of the accidental symmetry of the CGC\, wh ich straightforwardly reveals the presence of odd harmonics at leading ord er in the eikonal expansion.\n\nhttps://indico.ift.uam-csic.es/event/14/co ntributions/126/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/126/ END:VEVENT BEGIN:VEVENT SUMMARY:Maximally entangled proton and charged hadron multiplicity in Deep Inelastic Scattering DTSTART;VALUE=DATE-TIME:20221115T111500Z DTEND;VALUE=DATE-TIME:20221115T113000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-109@indico.ift.uam-csic.es DESCRIPTION:Speakers: Krzysztof Kutak (IFJ PAN)\nWe study the proposal by Kharzeev-Levin to determine entanglement entropy in Deep Inelastic Scatter ing (DIS) from parton distribution functions (PDFs) and relates the former to the entropy of final state hadrons. We find several uncertainties in t he current comparison to data\, in particular uncertainties related to the overall normalization\, the relation between charged versus total hadron multiplicity in the comparison to experimental results as well as differen t methods to determine the number of partons in Deep Inelastic Scattering. We further provide a comparison to data based on leading order HERA PDF a s well as PDFs obtained from an unintegrated gluon distribution subject to next-to-leading order Balitsky-Fadin-Kuraev-Lipatov and Baltisky-Kovchego v evolution. Within uncertainties we find good agreement with H1 data. We provide also predictions for entropy at lower photon virtualities\, where non-linear QCD dynamics is expected to become relevant.\n\nhttps://indico. ift.uam-csic.es/event/14/contributions/109/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/109/ END:VEVENT BEGIN:VEVENT SUMMARY:Elastic and exclusive forward proton measurements with ATLAS DTSTART;VALUE=DATE-TIME:20221118T090000Z DTEND;VALUE=DATE-TIME:20221118T092000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-107@indico.ift.uam-csic.es DESCRIPTION:Speakers: Peter Bussey ()\nThe elastic scattering of protons a t 13 TeV is measured in the range of protons??? transverse momenta allowin g the access to the Coulomb-Nuclear-Interference region. The data were col lected thanks to dedicated special LHC beta* = 2.5km optics. The total cro ss section as well as rho-parameter\, the ratio of the real to imaginary p art of the forward elastic scattering amplitude\, are measured and compare d to various models and to results from other experiments. The measurement of exclusive production of pion pairs at the LHC using 7 TeV data is also presented. This represents the first use of proton tagging to measure an exclusive hadronic final state at the LHC.\n\nhttps://indico.ift.uam-csic. es/event/14/contributions/107/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/107/ END:VEVENT BEGIN:VEVENT SUMMARY:Recent ATLAS results from small collision systems DTSTART;VALUE=DATE-TIME:20221115T095000Z DTEND;VALUE=DATE-TIME:20221115T101000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-110@indico.ift.uam-csic.es DESCRIPTION:Speakers: Sruthy Jyothi Das (University of Colorado Boulder)\ nThis talk presents recent ATLAS measurements from small collision systems . A particular focus will be on studies of jet production in p+Pb collisio ns to search for the jet quenching phenomenon in small systems. Further\, the measurement of longitudinal flow decorrelation in pp collisions will b e discussed. This study provides information on the initial longitudinal d ynamics in small collision systems. These measurements provide stringent t ests of the theoretical understanding of the initial state in heavy-ion co llisions.\n\nhttps://indico.ift.uam-csic.es/event/14/contributions/110/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/110/ END:VEVENT BEGIN:VEVENT SUMMARY:Welcome and introduction DTSTART;VALUE=DATE-TIME:20221114T085000Z DTEND;VALUE=DATE-TIME:20221114T090000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-196@indico.ift.uam-csic.es DESCRIPTION:Speakers: Agustín Sabio Vera (UAM)\, Arthur Marques Moraes (C entro Brasileiro de Pesquisas Fisicas)\, Grigorios Chachamis (LIP Lisbon)\ nhttps://indico.ift.uam-csic.es/event/14/contributions/196/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/196/ END:VEVENT BEGIN:VEVENT SUMMARY:Collectivity in small systems: status\, prospects\, interdisciplin ary connections DTSTART;VALUE=DATE-TIME:20221117T133000Z DTEND;VALUE=DATE-TIME:20221117T140000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-154@indico.ift.uam-csic.es DESCRIPTION:Speakers: Giuliano Giacalone (Universität Heidelberg)\nI give an overview of recent theoretical work devoted to understanding the obser vations of collective behavior in small systems (p-p and p-A collisions\, or peripheral A-A collisions). I discuss the progress made and some future prospects in relation to the two main facets of this issue\, represented\ , respectively\, by the initial state of the collisions and their subseque nt dynamics. I highlight new interdisciplinary connections triggered by th e investigation of collective phenomena with light ions and finite particl e numbers.\n\nhttps://indico.ift.uam-csic.es/event/14/contributions/154/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/154/ END:VEVENT BEGIN:VEVENT SUMMARY:ALICE heavy-ion Overview DTSTART;VALUE=DATE-TIME:20221116T090000Z DTEND;VALUE=DATE-TIME:20221116T093000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-176@indico.ift.uam-csic.es DESCRIPTION:Speakers: Cristiane Jahnke (BR Sao Paulo)\nALICE is a detector dedicated to study heavy-ion collisions and the physics of strongly inter acting matter at extreme energy densities\, where a phase of matter called quark-gluon plasma is formed. In this talk\, a selection of recent result s of Pb-Pb collisions obtained with ALICE is presented\, including results from soft to hard probes. Small systems results obtained in pp and p-Pb c ollisions with high multiplicity are also discussed\, since they can exhib it some features as seen in heavy-ion collisions. Lastly\, the future pers pectives after the detector upgrades are presented.\n\nhttps://indico.ift. uam-csic.es/event/14/contributions/176/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/176/ END:VEVENT BEGIN:VEVENT SUMMARY:Gluon transverse momentum distributions and saturation DTSTART;VALUE=DATE-TIME:20221115T113000Z DTEND;VALUE=DATE-TIME:20221115T114500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-185@indico.ift.uam-csic.es DESCRIPTION:Speakers: Pieter Taels (Universiteit Antwerpen)\nIn this talk\ , we review some recent advances in understanding the interplay between tr ansverse momentum dependent gluon distributions on the one hand\, and the saturation phenomenon at low $x$ on the other hand. Using the example of f orward heavy-quark pair hadro- or leptoproduction\, we argue that saturati on corrections are needed to properly take the gauge-dependence and polari sation properties of the gluon distribution into account. Moreover\, we gi ve an outline of how nonlinear JIMWLK evolution can be combined in a consi stent way with the resummation of Sudakov logarithms.\n\nhttps://indico.if t.uam-csic.es/event/14/contributions/185/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/185/ END:VEVENT BEGIN:VEVENT SUMMARY:Triple parton scatterings in high-energy hadronic collisions DTSTART;VALUE=DATE-TIME:20221117T092000Z DTEND;VALUE=DATE-TIME:20221117T093800Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-112@indico.ift.uam-csic.es DESCRIPTION:Speakers: David d'Enterria (CERN)\nA generic expression to com pute triple parton scattering (TPS) cross sections in high-energy proton-p roton (p-p) and proton-nucleus (p-A) collisions will be presented as a fun ction of the corresponding single-parton-scattering (SPS) cross sections a nd the transverse parton distribution in the proton encoded in the σeff\ ,TPS effective parameter. The value of σeff\,TPS is found to be closely r elated to the effective cross section that characterizes double-parton sca tterings (DPS). Estimates for triple charm (ccbar) and bottom (bbbar) prod uction (including quarkonia bound states) in pp and p-A collisions at LHC\ , FCC\, and ultrahigh cosmic-ray energies will be presented based on next- to-next-to-leading order perturbative calculations for the corresponding S PS cross sections.\n\nhttps://indico.ift.uam-csic.es/event/14/contribution s/112/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/112/ END:VEVENT BEGIN:VEVENT SUMMARY:Summary: WG2 DTSTART;VALUE=DATE-TIME:20221118T113000Z DTEND;VALUE=DATE-TIME:20221118T120000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-197@indico.ift.uam-csic.es DESCRIPTION:Speakers: Peter Plößl (DESY Hamburg)\nhttps://indico.ift.uam -csic.es/event/14/contributions/197/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/197/ END:VEVENT BEGIN:VEVENT SUMMARY:Recent ATLAS measurements in heavy-ion collisions DTSTART;VALUE=DATE-TIME:20221116T100000Z DTEND;VALUE=DATE-TIME:20221116T103000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-111@indico.ift.uam-csic.es DESCRIPTION:Speakers: Yeonju Go (University of Colorado Boulder)\nThis tal k presents an overview of recent ATLAS measurements in heavy ion collision systems. These include multiple measurements of jet production and struct ure\, which probe the dynamics of the hot\, dense Quark-Gluon Plasma forme d in relativistic nucleus-nucleus collisions\, and measurements of quarkon ia and heavy flavor production to probe the QGP medium properties. Further more\, the photo-nuclear events can provide a clean probe of the partonic structure of the nucleus analogous to deep inelastic scattering. This talk will also discuss a new measurement of dijet production in ultra-peripher al Pb+Pb collisions.\n\nhttps://indico.ift.uam-csic.es/event/14/contributi ons/111/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/111/ END:VEVENT BEGIN:VEVENT SUMMARY:Soft physics and tuning in Sherpa DTSTART;VALUE=DATE-TIME:20221114T110000Z DTEND;VALUE=DATE-TIME:20221114T112000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-160@indico.ift.uam-csic.es DESCRIPTION:Speakers: Max Knobbe (University of Göttingen)\nWe present fi rst soft physics and tuning results from the upcoming Sherpa 3.0 release. The new Sherpa release contains updated soft physics modules and is curren tly re-tuned and tested. Tuning results\, in particular for hadronisation and underlying event observables will be discussed.\n\nhttps://indico.ift. uam-csic.es/event/14/contributions/160/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/160/ END:VEVENT BEGIN:VEVENT SUMMARY:Double parton distributions of the nucleon from the lattice DTSTART;VALUE=DATE-TIME:20221114T135000Z DTEND;VALUE=DATE-TIME:20221114T140800Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-128@indico.ift.uam-csic.es DESCRIPTION:Speakers: Daniel Reitinger (Universität Regensburg)\nFor the description of double hard interactions\, double parton distributions (DPD s) are of major importance. We relate their Mellin Moments to the correlat ion functions of two local currents which we calculate on the lattice. We calculate all the Wick contractions for the first moment for the nucleon\, considering both polarisation and flavor interference. We furthermore com pare our results to the SU(6) quark model. Finally\, we test whether DPDs can be factorized into a convolution of generalized parton distributions ( GPDs).\n\nhttps://indico.ift.uam-csic.es/event/14/contributions/128/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/128/ END:VEVENT BEGIN:VEVENT SUMMARY:News on the cluster model DTSTART;VALUE=DATE-TIME:20221117T170000Z DTEND;VALUE=DATE-TIME:20221117T171500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-162@indico.ift.uam-csic.es DESCRIPTION:Speakers: Simon Plätzer ()\nI will present recent development of hadronization and colour reconnection in the Herwig 7 event generator. \n\nhttps://indico.ift.uam-csic.es/event/14/contributions/162/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/162/ END:VEVENT BEGIN:VEVENT SUMMARY:Open and hidden heavy-flavour production in small systems with ALI CE DTSTART;VALUE=DATE-TIME:20221117T115500Z DTEND;VALUE=DATE-TIME:20221117T122500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-139@indico.ift.uam-csic.es DESCRIPTION:Speakers: Fabio Colamaria (INFN Bari)\nMeasurements of charm a nd beauty production in proton-proton (pp) collisions are an important tes t of perturbative QCD calculations\, based on the factorisation approach. Recent results of charm baryon-to-meson ratios in pp collisions at midrapi dity have highlighted a significant enhancement of these ratios compared t o measurements in e+e– collisions\, suggesting that the fragmentation of charm quarks into mesons is not universal across different collision syst ems.\nThe study of open and hidden heavy-flavour hadron production in pp c ollisions as a function of the charged-particle multiplicity is a powerful tool to study the interplay between hard and soft QCD processes responsib le for particle production in hadronic collisions and to retrieve informat ion on the role of multi-parton interactions in heavy-flavour production. Furthermore\, recent LHC results highlighted the presence of collective-li ke effects among the particles produced in high-multiplicity pp and proton -lead (p–Pb) collisions\, similarly to what observed in heavy-ion collis ions\, where a quark-gluon plasma state is produced. Extending these studi es to the heavy-flavour sector is crucial for a better understanding of th e source of these features\, which is currently debated.\n\nThe excellent capabilities of the ALICE experiment for particle identification\, track a nd decay-vertex reconstruction allow us to precisely reconstruct a large s et of heavy-flavour species down to very low transverse momentum.\nIn this contribution\, the latest ALICE results of open heavy-flavour and quarkon ium production will be discussed and compared to predictions from differen t models. A particular focus will be given to measurements of baryon-to-me son production yields in the charm sector in pp collisions\, self-normalis ed yields of open and hidden heavy-flavour hadrons as a function of the ev ent multiplicity in pp collisions\, and elliptic-flow coefficient in high- multiplicity pp and p–Pb collisions.\n\nhttps://indico.ift.uam-csic.es/e vent/14/contributions/139/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/139/ END:VEVENT BEGIN:VEVENT SUMMARY:Summary: WG1 DTSTART;VALUE=DATE-TIME:20221118T110000Z DTEND;VALUE=DATE-TIME:20221118T113000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-199@indico.ift.uam-csic.es DESCRIPTION:Speakers: Dominic Hirschbuehl (University Wuppertal)\, Oldrich Kepka (Institute of Physics\, Prague)\nhttps://indico.ift.uam-csic.es/eve nt/14/contributions/199/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/199/ END:VEVENT BEGIN:VEVENT SUMMARY:Perturbative Color Correlations in Double Parton Scattering DTSTART;VALUE=DATE-TIME:20221117T094000Z DTEND;VALUE=DATE-TIME:20221117T095800Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-166@indico.ift.uam-csic.es DESCRIPTION:Speakers: Jonathan Mehl ()\nWe study the possible contribution of color correlations to the observable final states in Double Parton Sca ttering (DPS). We show that there is a specific class of Feynman diagrams related to the so-called 1->2 processes when the Sudakov suppression of co lor correlations is partially relaxed.\nTherefore\, the contributions of c olor correlations do not decrease with the transverse scales. We explain t hat while the contribution of color correlations in GPD may be significant \, there is an additional source of smallness in the cross sections since the created particles and complex conjugated ones in both hard processes m ust be close to each other in space-time. Consequently\, the color correla tions contribute up to 2-5% in the four jet final states in Tevatron and L HC kinematics. However\, the effective relaxation of Sudakov suppression g ives hope that although they are small relative to color singlet correlati ons\, they eventually can be observed.\nThis talk is based on the preprint : arXiv:2210.13282 by B. Blok and J. Mehl.\n\nhttps://indico.ift.uam-csic. es/event/14/contributions/166/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/166/ END:VEVENT BEGIN:VEVENT SUMMARY:WG 5 - Heavy Ion Summary DTSTART;VALUE=DATE-TIME:20221118T143000Z DTEND;VALUE=DATE-TIME:20221118T150000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-200@indico.ift.uam-csic.es DESCRIPTION:Speakers: Isobel Kolbe (IGFAE)\nhttps://indico.ift.uam-csic.es /event/14/contributions/200/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/200/ END:VEVENT BEGIN:VEVENT SUMMARY:Shedding light on pp and p--Pb collisions through forward energy d etection DTSTART;VALUE=DATE-TIME:20221117T142000Z DTEND;VALUE=DATE-TIME:20221117T144000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-149@indico.ift.uam-csic.es DESCRIPTION:Speakers: Chiara Oppedisano (INFN Torino)\nThe very forward en ergy\, measured at large rapidities\, is a powerful tool for characterisin g proton fragmentation in pp and p–Pb collisions. The correlation of for ward energy with particle production at midrapidity gives direct insights into the initial stages of high-energy hadronic collisions.\nThe forward e nergy can also be studied in relation with the large transverse momentum p articles produced at midrapidity. Such studies complement the measurements of the underlying event\, usually interpreted in the framework of models implementing centrality-dependent multiple parton interaction.\n\nResults about the correlation between the very forward energy and particle product ion at midrapidity in pp collisions at $\\sqrt{s}$ = 13 TeV and in p-Pb co llisions at $\\sqrt{s_{\\rm NN}}$ = 8.16 TeV\, measured with the ALICE det ector\, will be discussed.\n\nFinally\, these results will be compared wit h expectations of hadronic interaction event generators\, such as PYTHIA a nd EPOS\, to test the models capability in describing both the multi-parto n-interaction-dependent UE and the forward fragmentation\, observables mai nly driven by non-perturbative QCD physics.\n\nhttps://indico.ift.uam-csic .es/event/14/contributions/149/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/149/ END:VEVENT BEGIN:VEVENT SUMMARY:Towards Lattice Calculations of Double Parton Distributions DTSTART;VALUE=DATE-TIME:20221114T133000Z DTEND;VALUE=DATE-TIME:20221114T134800Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-147@indico.ift.uam-csic.es DESCRIPTION:Speakers: Max Jaarsma (Universiteit van Amsterdam)\nIn a facto rization approach to double parton scattering\, the initial state is descr ibed by double parton distributions (DPDs). These functions are currently poorly constrained by experiment\, but provide a view on interesting corre lations between partons in the hadron. We show that DPDs can be calculated from first principles using lattice QCD via the quasi-PDF approach\, open ing up a new way to constrain these distributions. Specifically\, we argue that there exists a factorization formula between the physical lightcone- DPDs and the lattice calculable quasi-DPDs that is governed by a perturbat ive matching kernel. We verify the perturbative nature of the matching ker nel at one-loop order by showing that the lightcone- and quasi-DPDs share the same infrared behaviour and that the matching kernel is free of logari thms involving infrared energy scales.\n\nhttps://indico.ift.uam-csic.es/e vent/14/contributions/147/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/147/ END:VEVENT BEGIN:VEVENT SUMMARY:Back-to-back di-$\\pi^{0}$ azimuthal correlations at forward rapid ities at STAR DTSTART;VALUE=DATE-TIME:20221115T144000Z DTEND;VALUE=DATE-TIME:20221115T150000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-146@indico.ift.uam-csic.es DESCRIPTION:Speakers: Xiaoxuan Chu (BNL)\nThe back-to-back di-$\\pi^{0}$ c orrelation functions in forward directions have been observed to be suppre ssed in $p(d)+$A collisions relative to $p$$+$$p$ collisions. The nonlinea r gluon dynamics in nuclei is one of the possible mechanisms responsible f or the suppression. In addition\, theorists pointed out that the double-pa rton scattering (DPS) can be an alternative explanation of the suppression in $d+$A collisions. During the 2015 and 2016 RHIC runs\, STAR collected data with the Forward Meson Spectrometer (FMS\, 2.6 \n\nhttps://indico.if t.uam-csic.es/event/14/contributions/146/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/146/ END:VEVENT BEGIN:VEVENT SUMMARY:Collectivity in small systems from the small-x perspective DTSTART;VALUE=DATE-TIME:20221115T090000Z DTEND;VALUE=DATE-TIME:20221115T093000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-152@indico.ift.uam-csic.es DESCRIPTION:Speakers: Tolga Altinoluk (National Centre for Nuclear Researc h (NCBJ)\, Warsaw)\nWe will give an overview of the progress in correlatio ns and collectivity from the initial state point of view within the Color Glass Condensate effective theory.\n\nhttps://indico.ift.uam-csic.es/event /14/contributions/152/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/152/ END:VEVENT BEGIN:VEVENT SUMMARY:WG 3 Small Systems Summary DTSTART;VALUE=DATE-TIME:20221118T133000Z DTEND;VALUE=DATE-TIME:20221118T140000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-201@indico.ift.uam-csic.es DESCRIPTION:Speakers: Carlota Andres (CPHT\, École polytechnique)\, Małg orzata Janik (Warsaw University of Technology)\nhttps://indico.ift.uam-csi c.es/event/14/contributions/201/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/201/ END:VEVENT BEGIN:VEVENT SUMMARY:High Multiplicity and small system from CMS DTSTART;VALUE=DATE-TIME:20221115T093000Z DTEND;VALUE=DATE-TIME:20221115T095000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-150@indico.ift.uam-csic.es DESCRIPTION:Speakers: Valentina Mariani ()\nThe latest results on the high multiplicity and small system produced within the CMS Collaboration will be discussed.\n\nhttps://indico.ift.uam-csic.es/event/14/contributions/150 / LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/150/ END:VEVENT BEGIN:VEVENT SUMMARY:Quark mass effects in the splitting part of double parton distribu tions DTSTART;VALUE=DATE-TIME:20221114T155000Z DTEND;VALUE=DATE-TIME:20221114T160800Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-148@indico.ift.uam-csic.es DESCRIPTION:Speakers: Peter Plößl (DESY Hamburg)\nDouble parton scatteri ng (DPS) provides access to information about nucleon structure not access ible in single parton scattering: spatial\, spin\, and colour correlations between the partons inside the nucleon. For short distances between the t wo probed partons the double parton distributions (DPDs) containing this i nformation can be calculated in perturbation theory. In this talk I will d iscuss how a consistent treatment of quark mass effects can be achieved in the evaluation of these short distance $1 \\to 2$ splitting DPDs. In addi tion I will briefly illustrate how - even without a full calculation from Feynman diagrams - the massive splitting can be approximated at next-to-le ading order in the strong coupling.\n\nhttps://indico.ift.uam-csic.es/even t/14/contributions/148/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/148/ END:VEVENT BEGIN:VEVENT SUMMARY:Structure and production mechanism of $X(3872)$ in high-energy had ronic reactions. DTSTART;VALUE=DATE-TIME:20221117T112500Z DTEND;VALUE=DATE-TIME:20221117T114300Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-140@indico.ift.uam-csic.es DESCRIPTION:Speakers: Antoni Szczurek (Institute of Nuclear Physics\, PAN) \nWe calculate the total cross section and transverse momentum distributio ns \nfor the production of the enigmatic $\\chi_{c1}(3872)$ (or X(3872)) \ nassuming different scenarios: \n$c \\bar c$ state and $D^{0*} {\\bar D}^0 + D^0 {\\bar D}^{0*}$ molecule.\nThe derivative of the $c \\bar c$ wave f unction needed in the first\nscenario is taken from a potential model calc ulations.\nCompared to earlier calculations of molecular state we include not only \nsingle parton scattering (SPS) but also double parton scatterin g (DPS) \ncontributions. \nThe latter one seems to give smaller contribut ion than the SPS one.\nThe upper limit for the DPS production of \n$\\chi_ {c1}(3872)$ is much below the CMS data.\nWe compare results of our calcula tions with existing experimental data \nof CMS\, ATLAS and LHCb collaborat ions.\nReasonable cross sections can be obtained in either $c \\bar c$\nor molecular $D {\\bar D}^*$ scenarios for $X(3872)$\, provided one takes \n into account both directly produced $D^0\, \\bar D^0$\, as well as \n$D^0\ , \\bar D^0$ from the decay of $D^*$. However arguments related \nto the l ifetime of $D^*$ suggest that the latter component may be not active.\nWit h these reservations\, also a hybrid scenario is not excluded.\n \nThe pre sentation will be based on:\\\\\nA. Cisek\, W. Schafer and A. Szczurek\, a rXiv:2203.07827.\n\nhttps://indico.ift.uam-csic.es/event/14/contributions/ 140/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/140/ END:VEVENT BEGIN:VEVENT SUMMARY:Recent ALICE results on photon-induced interactions DTSTART;VALUE=DATE-TIME:20221115T133000Z DTEND;VALUE=DATE-TIME:20221115T135000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-155@indico.ift.uam-csic.es DESCRIPTION:Speakers: Evgeny Kryshen ()\nStrong electromagnetic fields of accelerated heavy ions at the LHC can be used to probe photon-photon and p hoton-hadron interactions in a new kinematic regime. ALICE has extensively studied these processes in ultra-peripheral collisions (UPC) characterize d by impact parameters larger than the sum of nuclear radii. In recent yea rs\, photon-induced processes have been also observed in heavy ion collisi ons with nuclear overlap.\n\nIn this contribution\, we review recent ALICE results on the coherent $J/\\psi$ photoproduction in Pb-Pb UPCs probing n uclear gluon distributions at low Bjorken-x\, and the first measurement at the LHC of the dissociative $J/\\psi$ photoproduction off protons sensiti ve to quantum fluctuations of the proton structure. Latest ALICE measureme nts on the coherent $J/\\psi$ photoproduction in collisions with nuclear o verlap will be also presented. Finally\, the prospects for future measurem ents of photon-induced processes in the LHC Run 3 and 4 will be discussed. \n\nhttps://indico.ift.uam-csic.es/event/14/contributions/155/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/155/ END:VEVENT BEGIN:VEVENT SUMMARY:Rapidity gap dynamics: color fluctuations vs knockout mechanism DTSTART;VALUE=DATE-TIME:20221115T140500Z DTEND;VALUE=DATE-TIME:20221115T142000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-108@indico.ift.uam-csic.es DESCRIPTION:Speakers: Mark Strikman (Penn State University)\nIt is explai ned that the Good – Walker model of diffraction is viable only for small t which are parametrically smaller than the inverse square of the nucleo n radius. Example of J/\\psi production in inelastic rapidity gap kinemati cs is considered and it is argues that the knockout mechanism becomes imp ortant/ dominates already at -t ~ 0.5 GeV^2. Restrictions on the distribut ion of gluons in nucleons from the MPI phenomenology are also considered.\ n\nhttps://indico.ift.uam-csic.es/event/14/contributions/108/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/108/ END:VEVENT BEGIN:VEVENT SUMMARY:CMS results on diffraction and low x DTSTART;VALUE=DATE-TIME:20221118T092000Z DTEND;VALUE=DATE-TIME:20221118T094000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-188@indico.ift.uam-csic.es DESCRIPTION:Speakers: Christophe Royon ()\nCMS results on diffraction and low x\n\nhttps://indico.ift.uam-csic.es/event/14/contributions/188/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/188/ END:VEVENT BEGIN:VEVENT SUMMARY:Energy dependence of C-odd color charge correlations in the proton DTSTART;VALUE=DATE-TIME:20221115T163000Z DTEND;VALUE=DATE-TIME:20221115T164500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-143@indico.ift.uam-csic.es DESCRIPTION:Speakers: Adrian Dumitru (Baruch College\, CUNY)\nThe three po int light-cone correlation function of color charge densities is evaluated in light-cone gauge. The proton is approximated as a non-perturbative 3-q uark state plus perturbative corrections due to the emission of a gluon wh ich is not required to be soft. The resulting expressions provide the C-od d contribution to the initial conditions for high-energy evolution of the dipole scattering amplitude to small x.\n\nWe also present numerical estim ates for the perturbative 3-gluon exchange amplitude (hard Odderon) as a f unction of dipole size\, impact parameter\, their relative azimuthal angle \, and light-cone momentum cutoff x. We find that this amplitude increases as x decreases from 0.1 to 0.01. At yet lower x\, the reversal of this en ergy dependence would reflect the onset of universal small-x renormalizati on group evolution.\n\nhttps://indico.ift.uam-csic.es/event/14/contributio ns/143/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/143/ END:VEVENT BEGIN:VEVENT SUMMARY:NLO DGLAP splitting kernels for color non-singlet DPDs DTSTART;VALUE=DATE-TIME:20221117T100000Z DTEND;VALUE=DATE-TIME:20221117T101800Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-113@indico.ift.uam-csic.es DESCRIPTION:Speakers: Florian Fabry (DESY)\nCollinear double parton distri butions (DPDFs) possess a non-trivial color structure that can be classifi ed by a projection onto irreducible representations. The DGLAP evolution e quations then depend on the color representation of the respective DPDF. I n the color singlet case\, the DGLAP splitting kernels are identical to th e ones for ordinary single parton distributions. For the color non-singlet kernels\, this is not the case. At leading order in pertubation theory\, they can be deduced with little effort from the color singlet ones. At nex t-to-leading order\, the procedure becomes more involved and the kernels w ere unknown until now.\n\nIn this talk\, I will present for the first time the full splitting kernels for unpolarized\, longitudinal and quark trans versity DPDFs at NLO. They were obtained using two different and independe nt methods. The first one is based on graph-by-graph results for PDF split ting kernels\, the second one utilizes the matching formula for transverse momentum dependent matrix elements. As a by-product\, the NLO anomalous d imension for rapidity evolution of DPDFs in the gluon decuplet and 27-mult iplet was also obtained for the first time.\n\nhttps://indico.ift.uam-csic .es/event/14/contributions/113/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/113/ END:VEVENT BEGIN:VEVENT SUMMARY:Strangeness enhancement in dense environment with Pythia8/Angantyr DTSTART;VALUE=DATE-TIME:20221115T101000Z DTEND;VALUE=DATE-TIME:20221115T103000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-153@indico.ift.uam-csic.es DESCRIPTION:Speakers: Smita Chakraborty (Lund University)\nIn this talk\, we present our ongoing work on the inclusion of string interactions\, name ly rope hadronization in heavy ion collisions\, as an alternative to QGP. Rope hadronization\, where strings in close proximity form higher-order co lour multiplets\, has been earlier observed to explain QGP-like effects in p-p collisions such as strangeness enhancement.\nThe main challenge invol ved in implementing such mechanisms in dense environments is that the majo rity of strings in dense systems lie in random spatial orientation\, which makes calculating the force among all strings during an event a complex p roblem.\nIn our approach\, we use a special Lorentz frame\, where a pair o f string pieces are in parallel planes with respect to each other. Hence\, for a whole Pythia/Angantyr event\, every possible string pair is boosted to this frame to calculate the rope effects.\nThis novel approach of rope hadronization can produce the cumulative result of generating QGP-like ef fects in dense environments\, for both small and large systems. In this ta lk\, we present our new implementation (https://arxiv.org/abs/2205.11170) - the Gleipnir framework - in Pythia8/Angantyr and results from strangenes s yield analyses performed in high-multiplicity p-p and heavy-ion collisio ns with comparison to data for minimum bias events.\n\nhttps://indico.ift. uam-csic.es/event/14/contributions/153/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/153/ END:VEVENT BEGIN:VEVENT SUMMARY:Summary WG4: Diffraction and Small x DTSTART;VALUE=DATE-TIME:20221118T140000Z DTEND;VALUE=DATE-TIME:20221118T143000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-202@indico.ift.uam-csic.es DESCRIPTION:Speakers: Martin Hentschinski (Universidad de las Americas Pue bla)\nhttps://indico.ift.uam-csic.es/event/14/contributions/202/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/202/ END:VEVENT BEGIN:VEVENT SUMMARY:Flow of identified hadrons in p--Pb and pp collisions with ALICE DTSTART;VALUE=DATE-TIME:20221117T153000Z DTEND;VALUE=DATE-TIME:20221117T154500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-151@indico.ift.uam-csic.es DESCRIPTION:Speakers: Zuzana Moravcova (NBI)\nThe collective behaviour\, a ssociated with the quark-gluon plasma formation in ultrarelativistic heavy -ion collisions\, has been observed also in high-multiplicity collisions o f small systems such as pp and p--Pb at the LHC. Using the data recorded w ith the ALICE experiment\, thanks to its unique particle identification ca pability and the forward multiplicity detectors\, it is possible to study ultra-long-range correlations of identified particles. Such analyses allow to extract the flow coefficients of many different particle species free of non-flow contamination employing the template fit method. While the mas s ordering has been observed before\, a baryon-meson splitting in the inte rmediate $p_{\\rm T}$ region\, with a statistical significance larger than 3$\\sigma$\, is observed for the first time. Such a behaviour cannot be e xplained by the jet fragmentation alone\, thus advocating the contribution from the quark coalescence that shows the evidence of partonic collectivi ty.\n\nhttps://indico.ift.uam-csic.es/event/14/contributions/151/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/151/ END:VEVENT BEGIN:VEVENT SUMMARY:Measurement of the cross-section ratio sigma_(\\psi(2S))/sigma_(J/ \\psi(1S)) in exclusive photoproduction at HERA DTSTART;VALUE=DATE-TIME:20221115T142000Z DTEND;VALUE=DATE-TIME:20221115T144000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-156@indico.ift.uam-csic.es DESCRIPTION:Speakers: Grzegorz Grzelak (Warsaw University)\nOn behalf of t he ZEUS Collaboration.\n\nThe exclusive photoproduction reactions γp → J/ψ(1S)p and γp → ψ(2S)p have\nbeen measured at an ep centre-of-mass energy of 318 GeV with the ZEUS detector\nat HERA using an integrated lumi nosity of 373 pb−1. The measurement was made\nin the kinematic range 30 \n\nhttps://indico.ift.uam-csic.es/event/14/contributions/156/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/156/ END:VEVENT BEGIN:VEVENT SUMMARY:Multi-messenger heavy-ion physics with JETSCAPE DTSTART;VALUE=DATE-TIME:20221115T153000Z DTEND;VALUE=DATE-TIME:20221115T160000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-175@indico.ift.uam-csic.es DESCRIPTION:Speakers: Chun Shen (JETSCAPE)\nRelativistic heavy-ion collisi ons are complex systems that involve physics with multiple length scales. Despite its tiny size and short lifetime\, heavy-ion collisions emit vario us species of particles\, carrying different information about the underly ing dynamics of the Quark-Gluon Plasma (QGP). The soft hadrons exhibit col lective behaviors. QCD jets can probe the QGP at multiple length scales. E lectromagnetic radiations and W and Z bosons have negligible interactions with the QGP\; hence\, they carry information at their production points. Similar to modern astronomy\, such a variety of particle measurements form multi-messenger heavy-ion physics. The JETSCAPE framework is an open-sour ce theoretical tool to study all these observables in a unified setting. B y drawing constraints from multiple aspects of heavy-ion measurements\, th e JETSCAPE framework can comprehensively describe heavy-ion collisions. In this talk\, I will discuss the recent progress of the JETSCAPE framework in the quantitative descriptions of jet observables and deriving Baysian g lobal constraints on QGP transport properties. I will also highlight the f uture extension of the JETSCAPE framework to study small systems and heavy -ion collisions at large net baryon densities.\n\nhttps://indico.ift.uam-c sic.es/event/14/contributions/175/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/175/ END:VEVENT BEGIN:VEVENT SUMMARY:Helix string fragmentation and charged particle correlations with ATLAS DTSTART;VALUE=DATE-TIME:20221117T144000Z DTEND;VALUE=DATE-TIME:20221117T150000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-127@indico.ift.uam-csic.es DESCRIPTION:Speakers: Sarka Todorova ()\nCorrelations between charged part icles provide important insight about the hadronization process. The analy sis of the momentum difference between charged hadrons in pp\, p-lead\, an d lead-lead collisions of various energies is performed in order to study the dynamics of hadron formation. The spectra of correlated hadron chains are explored and compared to the predictions based on the quantized fragme ntation of a three dimensional QCD helix string. This provides an alternat ive view of the two-particle correlation phenomenon typically attributed t o the Bose-Einstein correlation. It provides insight into the mismodelling of low transverse momentum production of charged particles observed in ee \, pp and heavy ion collisions.\n\nhttps://indico.ift.uam-csic.es/event/14 /contributions/127/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/127/ END:VEVENT BEGIN:VEVENT SUMMARY:The role of multi-parton interactions in doubly-heavy hadron produ ction DTSTART;VALUE=DATE-TIME:20221117T090000Z DTEND;VALUE=DATE-TIME:20221117T091800Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-114@indico.ift.uam-csic.es DESCRIPTION:Speakers: Tom Hadavizadeh (Monash University)\nBeauty and char m quarks are ideal probes of pertubative Quantum Chromodymanics in proton- proton collisions\, owing to their large masses. In this talk the role of multi-parton interactions in the production of doubly-heavy hadrons is dis cussed. New methods of speeding up simulations with Pythia\, a Monte Carlo event generator\, when generating events containing heavy quarks have bee n developed\, enabling the production of large samples with multiple heavy -quark pairs. Significantly higher production rates of doubly-heavy hadron s are predicted in models that allow heavy quarks originating from differe nt parton-parton interactions (within the same hadron-hadron collision) to combine to form such hadrons. A set of experimental measurements capable of differentiating these additional contributions are suggested. Quantitat ive predictions are sensitive to the modelling of colour reconnections.\n\ nhttps://indico.ift.uam-csic.es/event/14/contributions/114/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/114/ END:VEVENT BEGIN:VEVENT SUMMARY:Diagram of high-energy nuclear collisions from NA61/SHINE DTSTART;VALUE=DATE-TIME:20221114T165000Z DTEND;VALUE=DATE-TIME:20221114T171000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-173@indico.ift.uam-csic.es DESCRIPTION:Speakers: Marek Gazdzicki (Jan Kochanowski University in Kielc e (PL))\nMany new particles\, mostly hadrons\, are produced in high-energy collisions between atomic nuclei. The most popular models describing the hadron production process are based on the creation\, evolution\, and deca y of resonances\, strings\, or quark-gluon plasma. The validity of these m odels is under vivid discussion\, and it seems that a common framework for this discussion is missing. Here we introduce the diagram of high-energy nuclear collisions\, where domains of the dominance of different hadron-pr oduction processes in the laboratory-controlled parameters\, the collision energy\, and the nuclear-mass number of colliding nuclei are indicated.\n We argue the recent experimental results\, in particular by NA61/SHINE\, l ocate boundaries between the domains\, allowing for the first time to sket ch an example diagram. Finally\, we discuss the immediate implications for experimental measurements and model development following the sketch.\n\n https://indico.ift.uam-csic.es/event/14/contributions/173/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/173/ END:VEVENT BEGIN:VEVENT SUMMARY:Studying saturation effects in dijet production at forward LHC cal orimeters DTSTART;VALUE=DATE-TIME:20221118T101000Z DTEND;VALUE=DATE-TIME:20221118T102500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-186@indico.ift.uam-csic.es DESCRIPTION:Speakers: Piotr Kotko (AGH UST)\nWe study dijet production wit hin the small-x improved TMD factorization\, which is a formalism based on the Color Class Condensate suitable to study relatively hard jet producti on processes and to take into account gluon saturation. The formalism also allows to perform the Sudakov resummation as well as implements the power corrections that are necessary to access the dijet decorrelation region. We study both the full b-space Sudakov resummation as well as the simplifi ed momentum space approach\, which is more suitable for Monte Carlo simula tions. We compute observables for the updated ATLAS kinematics as well as for the future FoCal kinematics and discuss modifications due to final sta te shower and hadronization.\n\nhttps://indico.ift.uam-csic.es/event/14/co ntributions/186/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/186/ END:VEVENT BEGIN:VEVENT SUMMARY:Multi-parton interactions in the LHC Run 3 and beyond DTSTART;VALUE=DATE-TIME:20221115T110000Z DTEND;VALUE=DATE-TIME:20221115T111500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-187@indico.ift.uam-csic.es DESCRIPTION:Speakers: Antonio Ortiz Velasquez (UNAM\, Mexico)\nThe studies as a function of the charged-particle multiplicity allowed the discovery of heavy-ion-like effects in pp collisions. However\, to some degree\, the multiplicity classifiers used so far bias the sample towards hard process es like multi-jet final states. This limitation of the existing event clas sifiers makes it difficult to perform\, for example\, jet-quenching search es in high-multiplicity pp collisions. In this work I will discuss differe nt approaches that have been developed over the last few years. The studie s range from machine learning to a new event classifier called flattenicit y. The resulting event classifiers have shown a strong sensitivity to mul ti-parton interactions.\n\nhttps://indico.ift.uam-csic.es/event/14/contrib utions/187/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/187/ END:VEVENT BEGIN:VEVENT SUMMARY:Double vector meson production in photon - induced interactions at the LHC DTSTART;VALUE=DATE-TIME:20221115T135000Z DTEND;VALUE=DATE-TIME:20221115T140500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-157@indico.ift.uam-csic.es DESCRIPTION:Speakers: Victor Paulo Goncalves (UFPel & WWU Munster)\nIn thi s contribution we analyze the double vector meson production in photon–h adron interactions at the LHC and present predictions for the $\\rho \\rh o$\, $\\phi \\phi$\, $J/\\Psi J/\\Psi$\, $\\rho J/\\Psi$ and $\\phi J/\\Ps i$ production considering the double scattering mechanism. We estimate the total cross sections and rapidity distributions at LHC energies and comp are our results with the predictions for the double vector meson productio n in $\\gamma \\gamma$ interactions at hadronic colliders. We present pred ictions for the different rapidity ranges probed by the ALICE and LHCb det ectors. Our results indicate that the analysis of the double vector meson production at the LHC can be useful to constrain the double-scattering mec hanism and improve our understanding of the QCD dynamics.\n\nhttps://indic o.ift.uam-csic.es/event/14/contributions/157/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/157/ END:VEVENT BEGIN:VEVENT SUMMARY:CMS Heavy Ion Overview DTSTART;VALUE=DATE-TIME:20221116T093000Z DTEND;VALUE=DATE-TIME:20221116T100000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-177@indico.ift.uam-csic.es DESCRIPTION:Speakers: Georgios Krintiras (University of Kansas)\nHeavy ion collisions allow access to novel QCD and QED studies in a laboratory. Thi s opportunity is actively pursued by the CMS experiment at the LHC and is an integral part of its experimental program. Precision measurements of th e properties of quark-gluon plasma (QGP) and the strong electromagnetic fi elds produced in heavy ion collisions at high energies are among recent re search pursuits. This talk will present highlights from CMS Collaboration on various QGP and QED probes\, such as jets\, electroweak bosons\, heavy flavor hadrons\, quarkonia\, and leptons.\n\nhttps://indico.ift.uam-csic.e s/event/14/contributions/177/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/177/ END:VEVENT BEGIN:VEVENT SUMMARY:Double $J/\\psi$ production as a test of parton correlations in do uble parton scattering DTSTART;VALUE=DATE-TIME:20221114T141000Z DTEND;VALUE=DATE-TIME:20221114T142800Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-115@indico.ift.uam-csic.es DESCRIPTION:Speakers: Sergey Koshkarev (University of Tartu)\nWith the adv ent of high luminosity accelerators\, multi parton scattering (MPS)\nphysi cs at high-energy hadron colliders like the Tevatron at Fermilab and the\n Large Hadron Collider (LHC) at CERN\, in particular those observing double \nparton scattering (DPS)\, has become one of the hottest topics of the mo dern\nexperimental particle physics. DPS results are usually interpreted i n terms of \nthe so-called ``pocket formula''. This formula defines that t he value of DPS \neffective cross section should be universal\, independen t of the final states or \nthe phase space. However\, there are some model s that predict correlations \nbetween partons inside a hadron. This leads us to a new class parton\ndistribution function\, double PDF\, that are no t tantamount to the simple\nmultiplication of the standard single PDF.\n\n Standard wisdom tells us that DPS should be more preferable at high energi es.\nThis is why most of the phenomenological analysis of a possible impac t of the\ndouble PDF effect are focused on LHC energies. However\, effects are mainly\nexpected at higher values of the Bjorken-$x$ or with a signif icant gap between\nthe $x$ values. Even for double $W$ boson production th e typical value for the\nBjorken-$x$ is $\\langle x \\rangle \\sim 0.01$.\ n\nIn contrast to that\, preferable conditions can be easily achieved at l ower\nenergy experiments like the Spin Physics Detector at the NICA collid er\, where\nthe DPS contribution could be relatively small\, but is still expected to be\nfar from zero.\n\nIn this talk we discuss the possible imp act of the evolution of the double PDF\non the double $J/\\psi$ production and the DPS effective cross sections at NICA\nenergies within the Gaunt-- Stirling model.\n\nhttps://indico.ift.uam-csic.es/event/14/contributions/1 15/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/115/ END:VEVENT BEGIN:VEVENT SUMMARY:Photon initiated double parton scattering: a new light on the prot on structure DTSTART;VALUE=DATE-TIME:20221114T161000Z DTEND;VALUE=DATE-TIME:20221114T162800Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-144@indico.ift.uam-csic.es DESCRIPTION:Speakers: Matteo Rinaldi (Dipartimento di Fisica e Geologia. U niversità degli studi di Perugia.Istituto Nazionale di Fisica Nucleare\, sezione Perugia)\nIn this contribution\, we present possible new advantage s of observing double parton\nscattering (DPS) processes initiated by phot on-proton interactions. The observation of\nDPS processes could lead to ac cess fundamental information on double parton distribution\nfunctions (dPD Fs) of the protons [3]. These new quantities\, appearing in the DPS cross\ nsection\, represent a novel and promising tool to access the 3D partonic structure of the\nproton. In fact\, dPDFs encode double parton correlation s in hadrons which cannot be\naccessed through\, e.g.\, GPDs. Up to date\, however\, dPDFs are almost unknown and\, in\nparticular\, their dependenc e on the transverse distance of partons. However\, as proved\nin Refs. [1\ , 2] the information on the partonic proton structure cannot be extracted from\nproton-proton collisions data. Therefore\, in Ref. [3] we proposed t he possibility to observe\nDPS in processes initiated by quasireal photons . At such low virtualities\, the photon will\nfluctuate hadronically and/o r electromagnetically in a q − q̄ pair which then initiates a\ndouble p arton scattering with the proton. The key idea is that the photon transver se size\ncould be almost controlled by measuring the virtuality and\, in t urn\, the interaction rate in\nthe which encodes information on the transv erse proton structure. We estimated the DPS\ncross section for the four je ts production in the HERA kinematics\, and concluded that\nDPS processes i n photoproduction gives a significant fraction of the four jet production\ ncross sections. Recently\, we started the study of the different mechanis ms contributing to\nphotoproduction of quarkonium pairs in NRQCD at the EI C\, namely via unresolved and\nresolved photons. In the latter case\, we s tudy the relevance of double parton scatterings\nalong the lines of Refs. [3\, 4\, 5\, 6\, 7\, 8\, 9]. Like for the hadroproduction case\, quarkoniu m-\npair photoproduction probes\, in different kinematical domains\, very different interesting\nphenomena which will be made accessible at the futu re US EIC.\nReferences\n[1] M. Rinaldi and F. A. Ceccopieri\, JHEP 1909\, 097 (2019)\n[2] M. Rinaldi and F. A. Ceccopieri\, Phys. Rev. D 97\, no. 7\ , 071501 (2018)\n[3] F. A. Ceccopieri and M. Rinaldi\, Phys. Rev. D 105 (2 022) no.1\, L011501\n[4] J. P. Lansberg\, H. S. Shao\, N. Yamanaka\, Y. J. Zhang and C. Noûs\, Phys. Lett. B\n807 (2020)\, 135559\n[5] J. P. Lansbe rg\, Phys. Rept. 889 (2020)\, 1-106 [arXiv:1903.09185 [hep-ph]].\n[6] J. P . Lansberg\, H. S. Shao\, N. Yamanaka and Y. J. Zhang\, Eur. Phys. J. C 79 (2019)\nno.12\, 1006 [arXiv:1906.10049 [hep-ph]].\n[7] H. S. Shao and Y. J. Zhang\, Phys. Rev. Lett. 117 (2016) no.6\, 062001\n[8] J. P. Lansberg a nd H. S. Shao\, Nucl. Phys. B 900 (2015)\, 273-294\n[9] J. P. Lansberg and H. S. Shao\,\ndoi:10.1016/j.physletb.2015.10.083\n\nhttps://indico.ift.ua m-csic.es/event/14/contributions/144/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/144/ END:VEVENT BEGIN:VEVENT SUMMARY:EPOS4 DTSTART;VALUE=DATE-TIME:20221116T113000Z DTEND;VALUE=DATE-TIME:20221116T115000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-158@indico.ift.uam-csic.es DESCRIPTION:Speakers: Klaus Werner ()\nWe report about the very recent rel ease (4.0.0) of the EPOS event generator\, with many new developments.\n\n The basic principle of treating (nucleonic or partonic) scatterings in par allel (the main element of the EPOS approach)\, based on S-matrix theory\, has been used for two decades. But there is a major problem. For inclusiv e cross sections (but only for those!)\, important cancellations occur\, l eading to factorization (in pp) or binary scaling (in AA). In a parallel s cattering scenario\, these cancellations must come out (they cannot be imp osed)\, which requires very high precision and good strategies -- and this is provided with EPOS4. We discuss these theoretical issues\, and applica tions from 4GeV to 13TeV.\n\nhttps://indico.ift.uam-csic.es/event/14/contr ibutions/158/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/158/ END:VEVENT BEGIN:VEVENT SUMMARY:Parton transport in anisotropic media DTSTART;VALUE=DATE-TIME:20221116T111500Z DTEND;VALUE=DATE-TIME:20221116T113000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-169@indico.ift.uam-csic.es DESCRIPTION:Speakers: Joao Barata (BNL)\nTransport based models are widely used to describe the evolution of hard probes in the quark gluon plasma. However\, so far such descriptions are strictly only valid in the limit wh ere the medium is assumed to be homogeneous in the transverse direction to the propagation. In this talk\, I will discuss how to generalize parton t ransport to include medium anisotropies. I will show that the resulting ev olution laws include quantum corrections to the usual Boltzmann transport. Finally\, I will show that such terms lead to power corrections to the je t quenching parameter.\n\nhttps://indico.ift.uam-csic.es/event/14/contribu tions/169/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/169/ END:VEVENT BEGIN:VEVENT SUMMARY:Azimuthal correlations in photoproduction and deep inelastic 𝑒 𝑝 scattering at HERA DTSTART;VALUE=DATE-TIME:20221117T154500Z DTEND;VALUE=DATE-TIME:20221117T160000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-167@indico.ift.uam-csic.es DESCRIPTION:Speakers: Peter Bussey ()\nOn behalf of the ZEUS Collaboration .\n\nCollective behaviour of final-state hadrons\, and multiparton interac tions are studied in high-multiplicity ep scattering at a centre-of-mass e nergy 𝑠√ = 318 GeV with the ZEUS detector at HERA. Two- and four-part icle azimuthal correlations\, as well as multiplicity\, transverse momentu m\, and pseudorapidity distributions for charged- particle multiplicities 𝑁ch ≥ 20 are measured. The dependence of two-particle correlations on the virtuality of the exchanged photon shows a clear transition from phot oproduction to neutral current deep inelastic scattering. For the multipli cities studied\, neither the measurements in photoproduction processes nor those in neutral current deep inelastic scattering indicate significant c ollective behaviour of the kind observed in high-multiplicity hadronic col lisions at RHIC and the LHC. Comparisons of PYTHIA predictions with the me asurements in photoproduction strongly indicate the presence of multiparto n interactions from hadronic fluctuations of the exchanged photon.\n\nhttp s://indico.ift.uam-csic.es/event/14/contributions/167/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/167/ END:VEVENT BEGIN:VEVENT SUMMARY:Angantyr DTSTART;VALUE=DATE-TIME:20221115T160000Z DTEND;VALUE=DATE-TIME:20221115T163000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-189@indico.ift.uam-csic.es DESCRIPTION:Speakers: Leif Lonnblad ()\nThe Angantyr model is used in Pyth ia8 to generate complete final states for collisions involving heavy ions. This talk will describe the main features of Angantyr\, but the main focu s will be on recent developments of models for final-state string interact ions\, and the resulting collective effects in pp\, pA and AA collisions i n Pythia8/Angantyr.\n\nhttps://indico.ift.uam-csic.es/event/14/contributio ns/189/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/189/ END:VEVENT BEGIN:VEVENT SUMMARY:Double J/ψ production in pi^-N interactions at COMPASS DTSTART;VALUE=DATE-TIME:20221114T143000Z DTEND;VALUE=DATE-TIME:20221114T144500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-165@indico.ift.uam-csic.es DESCRIPTION:Speakers: Andrei Gridin (JINR)\nThe production of J/ψ pairs i n high energy hadron collisions has been studied by several experiments. D espite the experimental and theoretical efforts\, the origin of the proces s and the relative weight of different production mechanisms still remain unknown. At different center of mass energies the process can be described by single- and double-parton scattering sub-processes and can also be rel ated to the hypothesis of the intrinsic charm of hadrons and the existence of exotic all-charm tetraquark states. Such states were predicted by theo ry for the first time in 1975 and have recently been experimentally observ ed.\nThe COMPASS experiment at CERN uses a 190 GeV/c negative pion beam sc attering off different nuclear targets to study dimuon pair production. In this talk\, the COMPASS results on J/psi pair production will be presente d and compared to theoretical models.\n\nhttps://indico.ift.uam-csic.es/ev ent/14/contributions/165/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/165/ END:VEVENT BEGIN:VEVENT SUMMARY:Enhancement of Charm from Gluon Splitting in HI Collisions DTSTART;VALUE=DATE-TIME:20221117T160000Z DTEND;VALUE=DATE-TIME:20221117T162000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-179@indico.ift.uam-csic.es DESCRIPTION:Speakers: Gian michele Innocenti ()\nIn this talk\, we show th at the same QCD formalism that accounts for the suppression of high-pT had ron spectra in heavy-ion collisions predicts a medium-enhanced pair produc tion in high-pT jets. We also present an experimental strategy to quantify such an enhancement by measuring the production of ccbar-tagged jets at h igh-pT in ultrarelativistic heavy-ion collisions at the LHC.\n\nhttps://in dico.ift.uam-csic.es/event/14/contributions/179/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/179/ END:VEVENT BEGIN:VEVENT SUMMARY:On the low transverse momentum cutoff for minijet production DTSTART;VALUE=DATE-TIME:20221117T110000Z DTEND;VALUE=DATE-TIME:20221117T112000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-161@indico.ift.uam-csic.es DESCRIPTION:Speakers: Sergey Ostapchenko (Hamburg University)\nVarious mec hanisms potentially capable to tame the energy rise of interaction cross s ections and of particle production in hadronic collisions are analysed. In particular\, a phenomenological implementation of higher twist correction s to parton scattering processes\, as realized in the QGSJET-III Monte Car lo generator\, is described in some detail. The relation of the mechanism to ad hoc parametrizations of the energy-dependent transverse momentum cut off for minijet production\, commonly employed by general purpose Monte Ca rlo generators is discussed.\n\nhttps://indico.ift.uam-csic.es/event/14/co ntributions/161/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/161/ END:VEVENT BEGIN:VEVENT SUMMARY:Two-scale evolution from rapidity-ordered BFKL cascade DTSTART;VALUE=DATE-TIME:20221115T114500Z DTEND;VALUE=DATE-TIME:20221115T120000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-183@indico.ift.uam-csic.es DESCRIPTION:Speakers: Maxim Nefedov (NCBJ\, Warsaw)\nThe two-scale evoluti on of Collins-Soper-Sterman-type for the unintegrated PDF in the regime qT \n\nhttps://indico.ift.uam-csic.es/event/14/contributions/183/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/183/ END:VEVENT BEGIN:VEVENT SUMMARY:Non-equilibrium effects and collective dynamics in relativistic pr oton-nucleus collisions DTSTART;VALUE=DATE-TIME:20221114T171000Z DTEND;VALUE=DATE-TIME:20221114T173000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-142@indico.ift.uam-csic.es DESCRIPTION:Speakers: Lucia Oliva (University of Catania\, INFN-Catania)\n The experimental observations of anisotropic flows in proton-proton and pr oton-nucleus collisions at RHIC and LHC energies has stimulated a big inte rest in these small systems due to the possible formation of short-lived d roplets of quark-gluon plasma. We investigate the effects of nonequilibriu m dynamics in relativistic proton-nucleus collisions by comparing a micros copic nonequilibrium transport approach\, the Parton-Hadron-String-Dynamic s (PHSD)\, with a macroscopic 2D+1 viscous hydrodynamical model\, VISHNew. The initial conditions for the hydrodynamic evolution are extracted from PHSD at different times in order to study its impact on the subsequent med ium evolution. We investigate the nonequilibrium dynamics by analysing qua ntities such as the energy density and the viscous corrections. We also di scuss the role of the collective flows. The origin of the elliptic flow in high-multiplicity proton-nucleus collisions is still under debate\; we ad dress this issue by applying the event-shape engineering through the trans verse spherocity observable\, capable of classifying different final-state event topologies. Moreover\, we discuss the development of the directed f low and in particular of its splitting\, focusing on the connection with t he baryon transport to midrapidity and the electromagnetic fields. The inv estigation of such anisotropic flow coefficients may allow to gain further insights into the mechanisms responsible for the QGP-like effects in smal l systems as well as to the transport properties of the produced medium\, such as the electric conductivity which drives the evolution of the electr omagnetic fields. \n\n[1] L. Oliva\, W. Fan\, P. Moreau\, S.A. Bass and E . Bratkovskaya\, Phys. Rev. C 106\, 044910 (2022)\n[2] L. Oliva\, P. Morea u\, V. Voronyuk and E. Bratkovskaya\, Phys. Rev. C 101\, 014917 (2020)\n\n https://indico.ift.uam-csic.es/event/14/contributions/142/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/142/ END:VEVENT BEGIN:VEVENT SUMMARY:CMS results on Heavy Flavor Flow DTSTART;VALUE=DATE-TIME:20221117T164000Z DTEND;VALUE=DATE-TIME:20221117T170000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-181@indico.ift.uam-csic.es DESCRIPTION:Speakers: Andre Govinda Stahl ()\nIn this talk\, we will prese nt the latest measurements of heavy flavor flow from the CMS collaboration .\n\nhttps://indico.ift.uam-csic.es/event/14/contributions/181/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/181/ END:VEVENT BEGIN:VEVENT SUMMARY:LHCb measurements of Quarkonia Production in Ultraperipheral PbPb collisions DTSTART;VALUE=DATE-TIME:20221117T162000Z DTEND;VALUE=DATE-TIME:20221117T164000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-180@indico.ift.uam-csic.es DESCRIPTION:Speakers: Hengne Li (South China Normal University)\nMeasureme nts of quarkonia production in ultra-peripheral heavy-ion collisions are o f important value to studying photon-photon and photon-nucleus interaction s\, the partonic structure of nuclei\, and mechanisms of the vector-meson output. LHCb is a single-arm forward detector with a pseudorapidity covera ge from 2 to 5. We will present a new measurement of the coherent $J/\\psi $ and $\\psi(2S)$ production in ultra-peripheral collisions using PbPb dat a collected by the LHCb detector. This gives the highest precision curren tly accessible in the forward rapidity. Comparisons to theoretical calcula tions and other experimental results will also be discussed.\n\nhttps://in dico.ift.uam-csic.es/event/14/contributions/180/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/180/ END:VEVENT BEGIN:VEVENT SUMMARY:Two-particle transverse momentum correlations as a tool to assess viscous effects in pp\, p--Pb\, and Pb--PB systems with the ALICE detector DTSTART;VALUE=DATE-TIME:20221117T140000Z DTEND;VALUE=DATE-TIME:20221117T142000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-145@indico.ift.uam-csic.es DESCRIPTION:Speakers: Víctor González (Wayne State University)\nTwo-part icle correlations are emerging as powerful tools for studying the medium p roduced in heavy-ion collisions. In particular\, two-particle transverse m omentum correlations enable measurements of the collision dynamics sensiti ve to momentum currents. Their evolution with collision multiplicity\, as proxy of the system lifetime\, gives information about the specific shear viscosity\, $\\eta/s$\, and the system relaxation time\, $\\tau_{\\pi}$. \ nParticle production measured at low momenta in small collision systems\, such as pp and p--Pb\, at LHC energies points to manifestations of collect ive behavior\, longitudinal long-range correlations\, and large azimuthal anisotropy\, that suggests those small systems may produce short-lived QGP matter similar to that observed in Pb--Pb collisions.\nIn this talk\, mea surements of two-particle transverse momentum correlators in pp\, p--Pb\, and Pb--Pb collisions are presented. The strength and shape of the correla tors are studied as functions of the produced particle multiplicity to ide ntify evidence for longitudinal broadening that might reveal the presence of viscous effects expected to arise in fluid-like systems produced in tho se collisions. The measured correlators\, their strengths and shapes\, are additionally compared to model predictions and their evolution\, along th e pp\, p--Pb\, and Pb--Pb systems\, is discussed.\n\nhttps://indico.ift.ua m-csic.es/event/14/contributions/145/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/145/ END:VEVENT BEGIN:VEVENT SUMMARY:HADML - towards a deep learning model for hadronization DTSTART;VALUE=DATE-TIME:20221114T100000Z DTEND;VALUE=DATE-TIME:20221114T102000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-159@indico.ift.uam-csic.es DESCRIPTION:Speakers: Andrzej Siodmok (Jagiellonian University)\nHadroniza tion is a complex quantum process whereby quarks and gluons become hadrons . The widely-used models of hadronization in event generators are based on physically-inspired phenomenological models with many free parameters. We propose an alternative approach whereby neural networks are used instead. Deep generative models are highly flexible\, differentiable\, and compati ble with Graphical Processing Unit (GPUs). We make the first step towards a data-driven machine learning-based hadronization model by replacing a co mponent of the hadronization model within the Herwig event generator (clus ter model) with a Generative Adversarial Network (GAN). We show that a GAN can reproduce the kinematic properties of cluster decays. Furthermore\, w e integrate this model into Herwig to generate entire events that can be c ompared with the output of the public Herwig simulator and with e+e- data. \n\nhttps://indico.ift.uam-csic.es/event/14/contributions/159/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/159/ END:VEVENT BEGIN:VEVENT SUMMARY:Transverse momentum broadening from NLL BFKL to all orders in pQCD DTSTART;VALUE=DATE-TIME:20221115T164500Z DTEND;VALUE=DATE-TIME:20221115T170000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-184@indico.ift.uam-csic.es DESCRIPTION:Speakers: Yacine Mehtar-Tani ()\nWe study\, to all orders in p erturbative QCD\, the universal behavior of the saturation momentum $Q_s(L )$ controlling the transverse momentum distribution of a fast parton propa gating through a dense QCD medium with large size $L$. Due to the double l ogarithmic nature of the quantum evolution of the saturation momentum\, it s large $L$ asymptotics is obtained by slightly departing from the double logarithmic limit of either next-to-leading log (NLL) BFKL or leading orde r DGLAP evolution equations. At fixed coupling\, or in conformal N = 4 SYM theory\, we derive the large $L$ expansion of $Q_s(L)$ up to order $\\alp ha_s^{3/2}$. In QCD with massless quarks\, where conformal symmetry is bro ken by the running of the strong coupling constant\, the one-loop QCD $\\b eta$-function fully accounts for the universal terms in the $Q_s(L)$ expan sion. Therefore\, the universal coefficients of this series are known exac tly to all orders in $\\alpha_s$.\n\nhttps://indico.ift.uam-csic.es/event/ 14/contributions/184/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/184/ END:VEVENT BEGIN:VEVENT SUMMARY:Back-to-back dijets production in DIS at small-$x$: Sudakov suppre ssion and gluon saturation at NLO DTSTART;VALUE=DATE-TIME:20221118T095500Z DTEND;VALUE=DATE-TIME:20221118T101000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-182@indico.ift.uam-csic.es DESCRIPTION:Speakers: Paul Caucal (Subatech\, IN2P3\, Nantes université)\ nWe study inclusive dijet production in deep inelastic scattering at NLO w ithin the Color Glass Condensate effective field theory. We begin by consi dering this process in general small-$x$ kinematics. We first show that th e differential cross-section is infrared and collinear safe. We demonstrat e the factorization of large rapidity logarithms that can then be resummed via JIMWLK renormalization\, and we extract the NLO impact factor for whi ch we provide explicit expressions.\n\nWe then specialize in the transvers e back-to-back kinematics where this process is sensitive to unpolarized a nd linearly polarized parts of the Weizsäcker-Williams (WW) gluon distrib ution. We isolate in the impact factor the large Sudakov double and single logarithms at finite $N_c$. We show that small-$x$ and Sudakov resummatio n can be performed simultaneously provided that the small-$x$ evolution of the WW distribution\, formulated in terms of the projectile rapidity\, is amended by a kinematic constraint that imposes lifetime ordering of succe ssive gluon emissions. We also comment on non-logarithmically enhanced ter ms in the impact factor that can break TMD factorization at NLO in the sat uration regime. We conclude by discussing on-going efforts towards the num erical evaluation of the NLO dijet cross-section at the EIC.\n\nRefs:\n[1] P. Caucal\, F. Salazar and R. Venugopalan\, JHEP 2021 (11)\, 1-108 18\,20 21\n[2] P. Caucal\, F. Salazar\, B. Schenke and R. Venugopalan\, arXiv:220 8.13872\n\nhttps://indico.ift.uam-csic.es/event/14/contributions/182/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/182/ END:VEVENT BEGIN:VEVENT SUMMARY:Jets separated by a large pseudorapidity gap at the Tevatron and a t the LHC DTSTART;VALUE=DATE-TIME:20221118T094000Z DTEND;VALUE=DATE-TIME:20221118T095500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-164@indico.ift.uam-csic.es DESCRIPTION:Speakers: Cristian Baldenegro ()\nWe present a phenomenologica l analysis of events with two high transverse momentum (pT_{T}T​) jets s eparated by a large (pseudo-)rapidity interval void of particle activity\, also known as jet-gap-jet events. In the limit where the collision energy $\\sqrt{s}$ is much larger than any other momentum scale\, the jet-gap-je t process is described in terms of perturbative pomeron exchange between p artons within the Balitsky-Fadin-Kuraev-Lipatov (BFKL) limit of perturbati ve quantum chromodynamics (QCD). The BFKL pomeron exchange amplitudes\, wi th resummation at the next-to-leading logarithmic approximation\, have bee n embedded in the PYTHIA8 Monte Carlo event generator. Standard QCD dijet events are simulated at next-to-leading order in αs_{s}s​ matched to pa rton showers with POWHEG+PYTHIA8. We compare our calculations to measureme nts by the CDF\, D0\, and CMS experiments at center-of-mass energies of 1. 8\, 7 and 13 TeV. The impact of the theoretical scales\, the parton densit ies\, final- and initial-state radiation effects\, multiple parton interac tions\, and $p_T$​ thresholds and multiplicities of the particles in the rapidity gap on the jet-gap-jet signature is studied in detail. With a st rict gap definition (no particle allowed in the gap)\, the shapes of most distributions are well described except for the CMS azimuthal-angle distri bution at 13 TeV. The survival probability is surprisingly well modelled b y multiparton interactions in PYTHIA8. Without multiparton interactions\, theoretical predictions based on two-channel eikonal models agree qualitat ively with fits to the experimental data.\n\nhttps://indico.ift.uam-csic.e s/event/14/contributions/164/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/164/ END:VEVENT BEGIN:VEVENT SUMMARY:Drell-Yan production and MC tuning at CMS DTSTART;VALUE=DATE-TIME:20221114T094000Z DTEND;VALUE=DATE-TIME:20221114T095500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-192@indico.ift.uam-csic.es DESCRIPTION:Speakers: Weijie Jin (University of Zürich)\nWith the 13 TeV proton-proton collisions measured by the CMS detector at the LHC\, a detai led measurement of the Z+jet production provides ideal conditions for the hadronic jet production study\, which provides a stringent test for pertur bative QCD. It also helps to understand the non-perturbative QCD models by reflecting the soft-gluon emission kinematics in the low Z pt region. The differential cross sections of the Z(l+l-)+jets are measured as a functio n of jet multiplicity in various Z pT regions. The azimuthal correlation b etween the Z boson and the leading jet as well as that between the two lea ding jets are also measured for different Z pT. The measurements are compa red to various theoretical predictions to evaluate the matrix\n+element ca luculation\, the parton density models and the multi-parton interaction (M PI) effects.\nOn the MC tuning side\, two color reconnection models\, QCD- inspired and gluon-move are implemented to the PYTHIA8 generator. New sets of parameters are obtained by tuning the parameters of the color reconnec tion models and multi-parton interactions simultaneously to the 1.96\, 7 a nd 13 TeV measurements that are sensitive to underlying event (UE) contrib utions. The predictions of the new tunings are compared for observables in various processes\, including the minimum bias observables\, the strange baryon particle multiplicity\, the jet substructure\, the Drell-Yan kinema tics and UE activity and jet structures in top pair productions.\n\nhttps: //indico.ift.uam-csic.es/event/14/contributions/192/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/192/ END:VEVENT BEGIN:VEVENT SUMMARY:Particle production as a function of the Underlying Event activity in small and large systems and search for jet-like modifications in ALICE DTSTART;VALUE=DATE-TIME:20221114T092000Z DTEND;VALUE=DATE-TIME:20221114T093500Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-163@indico.ift.uam-csic.es DESCRIPTION:Speakers: Omar Vazquez Rueda (University of Houston)\nMultiple measurements of high-multiplicity pp and p-A collisions at LHC energies h ave revealed that these small collision systems exhibit some of the quark- gluon plasma features\, e.g. collective behaviour and strangeness enhancem ent\, formerly thought to be achievable only in heavy-ion collisions. The dependence on multiplicity suggests significant final-state interactions. A proposed method to narrow down the origin of the phenomena is to study t he effect of Multi-Parton Interactions (MPIs). Although the MPIs cannot be measured directly\, the event observable $R_{\\mathrm{T}}$\, quantifying the magnitude of the underlying event\, has been suggested as an experimen tal proxy.\n\nMeasurements of the charged particle production as a functio n of $R_{\\mathrm{T}}$ in pp\, p-Pb and Pb-Pb collisions at $\\sqrt{s_{\\m athrm{NN}}}=5.02~\\mathrm{TeV}$ with the ALICE experiment will be presente d in the toward\, away and transverse regions. The UE contributions measur ed in the transverse region are subtracted from the toward and the away re gions to search for jet-like modifications in small systems. The jet-like signals are studied both as a function of $R_{\\mathrm{T}}$ and leading pa rticle $p_{\\mathrm{T}}$.\n\nFinally\, the results on the production of $\ \pi$\, K\, p\, $\\phi$ and $\\Xi$ as a function of $R_{\\mathrm{T}}$ in pp collisions at $\\sqrt{s}=13~\\mathrm{TeV}$ are presented to explore the p article species dependence. In particular\, the focus will be on the very low (high) $R_{\\mathrm{T}}$ to isolate the “jet” (UE) contributions. All the above results are compared with predictions from QCD-inspired Mon te Carlo event generators such as PYTHIA and EPOS-LHC.\n\nhttps://indico.i ft.uam-csic.es/event/14/contributions/163/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/163/ END:VEVENT BEGIN:VEVENT SUMMARY:Tuning Herwig 7 with the Lund string model DTSTART;VALUE=DATE-TIME:20221114T113000Z DTEND;VALUE=DATE-TIME:20221114T115000Z DTSTAMP;VALUE=DATE-TIME:20261006T131721Z UID:indico-contribution-14-141@indico.ift.uam-csic.es DESCRIPTION:Speakers: Pratixan Sarmah (Jagiellonian University)\nMonte Car lo Event Generators contain several free parameters that cannot be inferre d from first principles and need to be tuned to better model the data. Wit h increasing precision of perturbative theoretical calculations to higher orders and hence decreasing theoretical uncertainties\, it becomes crucial to study the systematics of non-perturbative phenomenological models. A r ecent attempt was made at tuning the combination of the angular-ordered pa rton shower (AOPS) in Herwig7 and Lund string hadronization model (AOPS+st ring) to LEP data with a new approach called Autotunes [1]. However\, the resultant tune shows worse performance to important observables like LEP e vent shapes when compared to the previous tunes of the AOPS+cluster model. Since the AOPS and the string hadronization model perform well in other t unes of Herwig7 and Pythia8\, we would naively expect them to perform bett er together and thus investigate further by tuning with the Professor appr oach adopted in [2]. We present the results of our tune and compare it wit h the Herwig7 default (AOPS+cluster model) and Autotunes tunes.\n\n\n[1] H igh dimensional parameter tuning for event generators\, J.Belm\, L.Gellers en\, Eur.Phys.J.C 80 (2020) 1\, 54\n[2] Systematic event generator tuning for the LHC\, A.Buckley et al\, Eur.Phys.J.C 65 (2010) 331-357\n\nhttps:// indico.ift.uam-csic.es/event/14/contributions/141/ LOCATION: URL:https://indico.ift.uam-csic.es/event/14/contributions/141/ END:VEVENT END:VCALENDAR