$ J/\psi +{\mathrm{jet}} $ diffractive production in the direct photon process at HERA

Abstract

We present a study of J/ψ + jet 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. PACS number(s): 12.40Nn, 13.85.Ni, 14.40.Gx

η c Diffractive Production in the Direct Photon Process

“…We have studied J/ψ +jet diffractive production in the direct photon process. [10,11] In this report, the η c diffractive production is studied in the direct photon process under the framework of NRQCD factorization formalism. It is found that η c production has different features from J/ψ production.…”