Speaker
Description
The associated production of $J/\psi+\gamma$ in proton-proton collisions is discussed theoretically for about 30 years [1], so it is relevant to make predictions for modern colliders energy: NICA ($27$ GeV), RICH ($200$ GeV), LHC ($13$ TeV). The differential cross section predictions were performed analytically and also using the KaTie event generator [2] both in an improved Color Evaporation Model [3] and NRQCD approach [4] at the first time with two different high-energy factorization models: the conventional Collinear Parton Model and the parton Reggeization approach. The parton Reggeization approach is based on the modified Kimber-Martin-Ryskin model for unintegrated parton distribution function [5,6] and Lipatov's effective field theory [7].
[1] Doncheski M. A., Kim C. S. Associated $J/\psi+\gamma$ production as a probe of the polarized gluon distribution // Physical Review D. – 1994. – vol. 49. – n. 9. – pp. 4463.
[2] Hameren A. KaTie: For parton-level event generation with kT-dependent initial states // Computer Physics Communications. – 2018. – vol. 224. – pp. 371-380.
[3] Fritzsch H. Producing heavy quark flavors in hadronic collisions. A test of quantum chromodynamics // Physics Letters B. – 1977. – vol. 67. – n. 2. – p. 217-221.
[4] Bodwin G. T., Braaten E., Lepage G. P. Rigorous QCD analysis of inclusive annihilation and production of heavy quarkonium // Physical Review D. – 1995. – vol. 51. – n. 3. – p. 1125.
[5] M. A. Kimber, A. D. Martin, and M. G. Ryskin Unintegrated parton distributions and prompt photon hadroproduction // Eur. Phys. J. - p. 12, 655 (2000)
[6] M.A. Nefedov, V.A. Saleev High-Energy Factorization for Drell-Yan process in $pp$ and $p{\bar p}$ collisions with new Unintegrated PDFs, Phys. Rev. D 102 (2020), 114018
[7] L. N. Lipatov, Nucl. Phys. B 452, 369 (1995).
