$J/\psi + jet$ diffractive production in the direct photon process at HERA
Jia-Sheng Xu, Hong-An Peng, Zhan-Yuan Yan, and Zhen-Min He

TL;DR
This paper investigates $J/\psi + jet$ diffractive production in the direct photon process at HERA, utilizing factorization theorems and NRQCD to explore the color-octet mechanism in heavy quarkonia production.
Contribution
It applies factorization formalism and diffractive gluon distributions to propose a new way to study heavy quarkonia production at HERA.
Findings
Process can be studied with current HERA data.
Provides insights into the color-octet mechanism.
Supports the use of diffractive gluon distributions in quarkonia production.
Abstract
We present a study of diffractive production in the direct photon process at HERA based on the factorization theorem for lepton-induced hard diffractive scattering and the factorization formalism of the nonrelativistic QCD (NRQCD) for quarkonia production. Using the diffractive gluon distribution function extracted from HERA data on diffractive deep inelastic scattering and diffractive dijet photon production, we show that this process can be studied at HERA with present integrated luminosity, and can give valuable insights in the color-octet mechanism for heavy quarkonia production.
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