Abstract
The transverse momentum distributions for inclusive ηc,b meson described by gluon-gluon interactions from photoproduction processes in relativistic heavy ion collisions are calculated. We considered the color-singlet (CS) and color-octet (CO) components within the framework of Nonrelativistic Quantum Chromodynamics (NRQCD) in the production of heavy quarkonium. The phenomenological values of the matrix elements for the color-singlet and color-octet components give the main contribution to the production of heavy quarkonium from the gluon-gluon interaction caused by the emission of additional gluon in the initial state. The numerical results indicate that the contribution of photoproduction processes cannot be negligible for midrapidity in p-p and Pb-Pb collisions at the Large Hadron Collider (LHC) energies.
Highlights
Heavy quarkonium is a multiscale system which can probe all regimes of Quantum Chromodynamics (QCD) and present an ideal laboratory for testing the interplay between perturbative and nonperturbative QCD within a controlled environment
Many measurement reports have been published by ALICE collaboration [1, 2], CMS collaboration [3, 4], ATLAS collaboration [5, 6], and LHCb collaboration [7, 8] at the Large Hadron Collider (LHC) energies; several theoretical approaches have been proposed such as the color-singlet (CS) mechanism [9, 10], the color-octet (CO) mechanism [11, 12], the color evaporation mechanism [13, 14], the color-dipole mechanism [15,16,17,18], the mixed heavy-quark hybrids mechanism [19], the recombination mechanism [20,21,22,23,24], the photoproduction mechanism [25,26,27,28,29,30,31], the potential Nonrelativistic Quantum Chromodynamics approach [32,33,34], the transverse-momentum-dependent factorization approach [35], the transport approach [36,37,38,39,40,41], the kT-factorization approach [42,43,44,45], the fragmentation approach [46,47,48,49,50,51,52], and the Nonrelativistic Quantum Chromodynamics (NRQCD) approach [53,54,55,56,57,58,59,60,61,62,63,64,65,66,67]
We have investigated the production of heavy quarkonium ηc,b meson from the gluon-gluon interactions in p-p collisions and Pb-Pb collisions at LHC energies
Summary
Heavy quarkonium is a multiscale system which can probe all regimes of Quantum Chromodynamics (QCD) and present an ideal laboratory for testing the interplay between perturbative and nonperturbative QCD within a controlled environment. We extend the hard photoproduction mechanism [68] to the heavy quarkonium production and investigate the production of inclusive ηc,b meson in p-p and Pb-Pb collisions at the LHC. According to [69], the light qq contributions for heavy quarkonium production are negligible; in this work we only consider the contributions of gluon-gluon processes caused by the emission. The partons from the nucleus can emit high energy photons that can fluctuate into gluons and interact with the partons of the other nucleus. We consider that the hard photoproduction processes of a charged parton of the incident nucleon can emit a high energy photon in high energy nucleus-nucleus collisions.
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