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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]
Copyright of International Journal of Modern Physics A: Particles & Fields; Gravitation; Cosmology; Nuclear Physics is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 185394158
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Associated production of J∕ψ and direct photon in the NRQCD and the ICEM using the high-energy factorization.
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  Data: <searchLink fieldCode="AR" term="%22Alimov%2C+Lev%22">Alimov, Lev</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> alimov.le@yandex.ru</i><br /><searchLink fieldCode="AR" term="%22Karpishkov%2C+Anton%22">Karpishkov, Anton</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> karpishkoff@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Saleev%2C+Vladimir%22">Saleev, Vladimir</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> saleev.va@ssau.ru</i>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Modern+Physics+A%3A+Particles+%26+Fields%3B+Gravitation%3B+Cosmology%3B+Nuclear+Physics%22">International Journal of Modern Physics A: Particles & Fields; Gravitation; Cosmology; Nuclear Physics</searchLink>. 5/30/2025, Vol. 40 Issue 15, p1-13. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Partons%22">Partons</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+chromodynamics%22">Quantum chromodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Charmonium%22">Charmonium</searchLink><br /><searchLink fieldCode="DE" term="%22Photons%22">Photons</searchLink><br /><searchLink fieldCode="DE" term="%22Factorization%22">Factorization</searchLink>
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  Label: Abstract
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  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Modern Physics A: Particles & Fields; Gravitation; Cosmology; Nuclear Physics is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1142/S0217751X25500204
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      – Code: eng
        Text: English
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        PageCount: 13
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    Subjects:
      – SubjectFull: Partons
        Type: general
      – SubjectFull: Quantum chromodynamics
        Type: general
      – SubjectFull: Charmonium
        Type: general
      – SubjectFull: Photons
        Type: general
      – SubjectFull: Factorization
        Type: general
    Titles:
      – TitleFull: Associated production of J∕ψ and direct photon in the NRQCD and the ICEM using the high-energy factorization.
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            NameFull: Alimov, Lev
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            NameFull: Karpishkov, Anton
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            NameFull: Saleev, Vladimir
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            – D: 30
              M: 05
              Text: 5/30/2025
              Type: published
              Y: 2025
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            – TitleFull: International Journal of Modern Physics A: Particles & Fields; Gravitation; Cosmology; Nuclear Physics
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