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SUMMARY:Single pion production from interactions with dark matter
DTSTART;VALUE=DATE-TIME:20250917T082000Z
DTEND;VALUE=DATE-TIME:20250917T084000Z
DTSTAMP;VALUE=DATE-TIME:20260518T010021Z
UID:indico-contribution-111-451@indico.ift.uam-csic.es
DESCRIPTION:Speakers: Jaime Hoefken Zink (Narodowe Centrum Badań Jądrowy
 ch (NCBJ))\nWe present a comprehensive theoretical framework describing si
 ngle pion resonant production through inelastic dark fermion–nucleon int
 eractions mediated by resonances in the GeV-scale regime. Building upon th
 e Rein–Sehgal approach\, we derive differential cross sections for proce
 sses in which an incoming dark fermion scatters off a nucleon\, exciting a
  resonance that subsequently decays into a nucleon and a pion. Our formula
 tion accommodates various mediator types—namely\, dark photons with vect
 or and axial couplings\, as well as scalar and pseudoscalar mediators—th
 ereby extending the conventional approach that Rein\, Sehgal and Berger pe
 rformed for neutrino interactions. Transition amplitudes for the nucleon-t
 o-resonance conversion are computed using the relativistic harmonic-oscill
 ator quark model from Feynman\, Kislinger and Ravndal\, while a Breit–Wi
 gner prescription is employed to incorporate finite resonance widths. This
  framework offers a useful tool for interpreting experimental data in dark
  sector and dark matter searches and represents a contribution to elucidat
 e the possible role of resonances in GeV-scale phenomenology.\n\nhttps://i
 ndico.ift.uam-csic.es/event/29/contributions/451/
LOCATION:IFT UAM/CSIC
URL:https://indico.ift.uam-csic.es/event/29/contributions/451/
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BEGIN:VEVENT
SUMMARY:Long-lived particles at Spallation Neutron Sources
DTSTART;VALUE=DATE-TIME:20250917T080000Z
DTEND;VALUE=DATE-TIME:20250917T082000Z
DTSTAMP;VALUE=DATE-TIME:20260518T010021Z
UID:indico-contribution-111-455@indico.ift.uam-csic.es
DESCRIPTION:Speakers: Salvador Urrea González (IJCLab)\nSpallation neutro
 n sources can provide an intense source of new\, light particles from the 
 decay at rest of pions\, muons\, and kaons.\nConsidering a variety of spal
 lation sources around the world\, we study the sensitivity of existing neu
 trino detectors to the decay of these new particles.\nAt J-PARC\, we show 
 that the fast\, magnetized\, gaseous argon chambers of the ND280 detector 
 could place leading limits on light particles decaying to $e^+e^-$ and tha
 t the liquid-scintillator detectors of the J-PARC Sterile Neutrino Search 
 at the JSNS (JSNS$^2$) experiment can exploit double- and triple-coinciden
 ce signals from $\\mu^+\\mu^-$ and $\\pi^+\\pi^-$ to place new limits on h
 eavy neutral leptons.\nAt Oak Ridge\, we show that the suite of detectors 
 at the COHERENT experiment\, despite their smaller size\, would also have 
 world-leading sensitivity to axion-like-particles and muonphilic light sca
 lars.\nWe also discuss new opportunities for Coherent Captain Mills at Los
  Alamos and compare our results to on-going searches at the Short-Baseline
  Neutrino Program at Fermilab.\nSpallation sources have the potential to e
 xplore more than an order of magnitude beyond current constraints in some 
 new physics models\, encouraging further study on data acquisition and bac
 kground rejection by experimental collaborations.\n\nhttps://indico.ift.ua
 m-csic.es/event/29/contributions/455/
LOCATION:IFT UAM/CSIC
URL:https://indico.ift.uam-csic.es/event/29/contributions/455/
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BEGIN:VEVENT
SUMMARY:Overview of FIP searches at fixed-target experiments
DTSTART;VALUE=DATE-TIME:20250917T073000Z
DTEND;VALUE=DATE-TIME:20250917T080000Z
DTSTAMP;VALUE=DATE-TIME:20260518T010021Z
UID:indico-contribution-111-479@indico.ift.uam-csic.es
DESCRIPTION:Speakers: Maksym Ovchynnikov (CERN\, Department of Theoretical
  Physics)\nhttps://indico.ift.uam-csic.es/event/29/contributions/479/
LOCATION:IFT UAM/CSIC
URL:https://indico.ift.uam-csic.es/event/29/contributions/479/
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