Conveners
WG2: Double Parton Scattering
- Peter Plößl (DESY Hamburg)
- Ankita Mehta (University of Hamburg)
WG2: Double Parton Scattering
- Ankita Mehta (University of Hamburg)
- Peter Plößl (DESY Hamburg)
WG2: Double Parton Scattering
- Peter Plößl (DESY Hamburg)
- Ankita Mehta (University of Hamburg)
WG2: Double Parton Scattering
- Ankita Mehta (University of Hamburg)
- Peter Plößl (DESY Hamburg)
In a factorization approach to double parton scattering, the initial state is described by double parton distributions (DPDs). These functions are currently poorly constrained by experiment, but provide a view on interesting correlations between partons in the hadron. We show that DPDs can be calculated from first principles using lattice QCD via the quasi-PDF approach, opening up a new way to...
For the description of double hard interactions, double parton distributions (DPDs) are of major importance. We relate their Mellin Moments to the correlation 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 compare our results to...
With the advent of high luminosity accelerators, multi parton scattering (MPS)
physics at high-energy hadron colliders like the Tevatron at Fermilab and the
Large Hadron Collider (LHC) at CERN, in particular those observing double
parton scattering (DPS), has become one of the hottest topics of the modern
experimental particle physics. DPS results are usually interpreted in terms of
the...
The production of J/ψ pairs in high energy hadron collisions has been studied by several experiments. Despite the experimental and theoretical efforts, the origin of the process 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...
CMS results on Double Parton Scattering
The GS09 and Pythia double PDFs (dPDFs) have both been constructed to satisfy (in some 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 product of single PDFs, in the context of their predictions for double Drell-Yan production. I explain the differences between these predictions in terms of the...
Double parton scattering (DPS) provides access to information about nucleon structure not accessible in single parton scattering: spatial, spin, and colour correlations between the partons inside the nucleon. For short distances between the two probed partons the double parton distributions (DPDs) containing this information can be calculated in perturbation theory. In this talk I will discuss...
In this contribution, we present possible new advantages of observing double parton
scattering (DPS) processes initiated by photon-proton interactions. The observation of
DPS processes could lead to access fundamental information on double parton distribution
functions (dPDFs) of the protons [3]. These new quantities, appearing in the DPS cross
section, represent a novel and promising tool to...
Beauty and charm 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 discussed. New methods of speeding up simulations with Pythia, a Monte Carlo event generator, when generating events containing heavy quarks have been developed,...
A generic expression to compute triple parton scattering (TPS) cross sections in high-energy proton-proton (p-p) and proton-nucleus (p-A) collisions will be presented as a function of the corresponding single-parton-scattering (SPS) cross sections and the transverse parton distribution in the proton encoded in the σeff,TPS effective parameter. The value of σeff,TPS is found to be closely...
We study the possible contribution of color correlations to the observable final states in Double Parton Scattering (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 color correlations is partially relaxed.
Therefore, the contributions of color correlations do not decrease with the transverse scales. We...
Collinear double parton distributions (DPDFs) possess a non-trivial color structure that can be classified by a projection onto irreducible representations. The DGLAP evolution equations then depend on the color representation of the respective DPDF. In the color singlet case, the DGLAP splitting kernels are identical to the ones for ordinary single parton distributions. For the color...
We calculate the total cross section and transverse momentum distributions
for the production of the enigmatic $\chi_{c1}(3872)$ (or X(3872))
assuming different scenarios:
$c \bar c$ state and $D^{0*} {\bar D}^0 + D^0 {\bar D}^{0*}$ molecule.
The derivative of the $c \bar c$ wave function needed in the first
scenario is taken from a potential model calculations.
Compared to earlier...
