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SUMMARY:Associated $J/\\psi$ and photon production in the Parton Reggeizat
 ion Approach at high energy
DTSTART;VALUE=DATE-TIME:20241025T070000Z
DTEND;VALUE=DATE-TIME:20241025T071500Z
DTSTAMP;VALUE=DATE-TIME:20260914T213819Z
UID:indico-contribution-4317@cern.ch
DESCRIPTION:Speakers: Lev Alimov (Samara University)\nThe study of the ass
 ociated production of $J/\\psi$-mesons and\nphotons is very impotent to ve
 rify perturbative quantum\nchromodynamics\, factorization approaches\, hea
 vy quark to heavy\nquarkonium hadronization models and to extracting the P
 arton\nDistribution Function (PDF) of gluon in a proton from experimental\
 ndata. In this paper\, we study the associated production of\n$J/\\psi$-me
 sons and photons at the energies of the Large Hadron\nCollider using the P
 arton Reggeization Approach (PRA) [1]\, which is\nbased on Lipatov's effec
 tive field theory [2] and the modified\nKimber-Martin-Ryskin model for uni
 ntegrated PDFs [3\, 4]. We use two\ndifferent heavy-quark to heavy quarkon
 ium hadronization models: the\nnon-relativistic quantum chromodynamics (NR
 QCD) [5] and the improved\ncolor evaporation model (ICEM) [6].\n\nWe have 
 found that the PRA based predictions for production cross\nsections are hi
 gher than next-to-leading order collinear parton\nmodel results. We have s
 hown that contributions of the direct\nproduction processes via the color-
 octet intermediate states in the\nNRQCD are suppressed relatively to the p
 rocess via the color-singlet\nintermediate state\, so the Color Singlet Mo
 del (CSM) can be used for\npredictions at the $p_{TJ/\\psi}\n\nhttps://ind
 ico.particle.mephi.ru/event/436/contributions/4317/
LOCATION: Moskvorechye 2
URL:https://indico.particle.mephi.ru/event/436/contributions/4317/
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