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Associated production of J∕ψ and direct photon in the NRQCD and the ICEM using the high-energy factorization.

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Title: Associated production of J∕ψ and direct photon in the NRQCD and the ICEM using the high-energy factorization.
Authors: Alimov, Lev1 (AUTHOR) alimov.le@yandex.ru, Karpishkov, Anton1,2 (AUTHOR) karpishkoff@gmail.com, Saleev, Vladimir1,2 (AUTHOR) saleev.va@ssau.ru
Source: International Journal of Modern Physics A: Particles & Fields; Gravitation; Cosmology; Nuclear Physics. 5/30/2025, Vol. 40 Issue 15, p1-13. 13p.
Subjects: Partons, Quantum chromodynamics, Charmonium, Photons, Factorization
Abstract: We study the associated J ∕ ψ and direct photon production in the high-energy factorization, as it is formulated in the parton Reggeization approach, using two different models for the hadronization of a heavy quark–antiquark pair into a heavy quarkonium, namely the nonrelativistic quantum chromodynamics (NRQCD) and the improved color evaporation model (ICEM). We find essential differences in the predictions for cross-sections and transverse momenta spectra obtained using the NRQCD and the ICEM, which can be used to discriminate between these models. Our prediction for cross-sections of the associated J ∕ ψ and direct photon production at the LHC energies slightly overestimates the results obtained earlier in the next-to-leading order (NLO) calculation in the collinear parton model (CPM). We predict different two-particle correlation spectra in the associated J ∕ ψ and direct photon production, which may be of interest for experimental study. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:We study the associated J ∕ ψ and direct photon production in the high-energy factorization, as it is formulated in the parton Reggeization approach, using two different models for the hadronization of a heavy quark–antiquark pair into a heavy quarkonium, namely the nonrelativistic quantum chromodynamics (NRQCD) and the improved color evaporation model (ICEM). We find essential differences in the predictions for cross-sections and transverse momenta spectra obtained using the NRQCD and the ICEM, which can be used to discriminate between these models. Our prediction for cross-sections of the associated J ∕ ψ and direct photon production at the LHC energies slightly overestimates the results obtained earlier in the next-to-leading order (NLO) calculation in the collinear parton model (CPM). We predict different two-particle correlation spectra in the associated J ∕ ψ and direct photon production, which may be of interest for experimental study. [ABSTRACT FROM AUTHOR]
ISSN:0217751X
DOI:10.1142/S0217751X25500204