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SUMMARY:Leptonic Angular Coefficients in J/psi Production within the Parto
 n Reggeization Approach
DTSTART;VALUE=DATE-TIME:20261030T090000Z
DTEND;VALUE=DATE-TIME:20261030T091500Z
DTSTAMP;VALUE=DATE-TIME:20261030T064730Z
UID:indico-contribution-6164@cern.ch
DESCRIPTION:Speakers: Kirill Shilyaev (Samara University)\nThe process of 
 $J/\\psi$ production is an important probe for investigation of gluon part
 on distribution functions (PDFs) in proton. Though the charmonium producti
 on cross section and spectra can be satisfactorily calculated in various f
 rameworks\, another observables\, such as angular coefficients in leptonic
  decay of $J/\\psi$\, do not have consistent description yet. In the prese
 nt work\, we obtain estimations for three leptonic angular coefficients in
  the high-energy factorisation (HEF) formalism [1] as it is formulated in 
 the Parton Reggeization Approach (PRA) [2]. We use the nonrelativistic QCD
  (NRQCD) as a hadronisation model for charmonium hadronisation [3]. Firstl
 y\, we made calculations for unpolarised $J/\\psi$ cross section and compa
 red them with the existing experimental data. Then we obtained results for
  leptonic angular coefficients in kinematics of the PHENIX and HERA-B expe
 riments and made predictions for the future SPD NICA experiment.\n\nRefere
 nces:\n\n[1] J. C. Collins and R. K. Ellis\, Nucl. Phys. B360\, 3 (1991)\;
  S. Catani and F. Hautmann\, Nucl. Phys. B427\, 475 (1994)\; L. V. Gribov\
 , E. M. Levin\, and M. G. Ryskin\, Phys. Rep. 100\, 1 (1983)\;\n\n[2] M. A
 . Nefedov\, V. A. Saleev\, and A. V. Shipilova\, Phys. Rev. D 87\, 094030 
 (2013)\; A. V. Karpishkov\, M. A. Nefedov\, and V. A. Saleev\, Phys. Rev. 
 D 96\, 096019 (2017)\; M. A. Nefedov and V. A. Saleev\, Phys. Rev. D 102\,
  114018 (2020)\;\n\n[3] G. T. Bodwin\, E. Braaten\, and G. P. Lepage\, Phy
 s. Rev. D 51\, 1125 (1995).\n\nhttps://indico.particle.mephi.ru/event/626/
 contributions/6164/
LOCATION: Conference Hall 3
URL:https://indico.particle.mephi.ru/event/626/contributions/6164/
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