Inclusive diffractive heavy quarkonium photoproduction including quark subprocesses

To test the contributions of the quark subprocesses to the inclusive diffractive heavy quarkonium photoproduction, we first investigate the inclusive nondiffractive direct and resolved photoproduction of J/Psi in the framework of nonrelativistic quantum chromodynamics (NRQCD). We find that the theoretical total cross section of heavy quarkonium productions are in good agreement with the data available at HERA, once the gamma q, qg, and qq subprocesses in the heavy quark pair productions are taken into account. Then we predict the inclusive diffractive rapidity and transverse momentum distributions of J/Psi, Psi(2S), and Upsilon(1S) in pp, pPb, and PbPb collisions at the CERN Large Hadron Collider by using our quark improved NRQCD model. We find that the contributions from the quark involved subprocesses to quarkonium photoproduction are about 6%-15%. The numerical results show that the contributions from quark involved subprocesses are significant modification in inclusive diffractive heavy quarkonium photoproduction.

Automated summary

This study investigates the contributions of quark subprocesses to inclusive diffractive heavy quarkonium photoproduction. The results show that these quark subprocesses have a significant impact, accounting for about 6%-15% of the total contribution.