QCD calculation of J/psi+gamma mass distributions

Abstract

We compute the J/psi+gamma invariant-mass distributions from the QCD subprocess g + g --> J/psi+gamma. At large masses, this subprocess is the dominant mechanism for J/psi+gamma production, and data could provide a good test of QCD. The mass distribution peaks at relatively small masses (3.4 - 4.0 GeV) and the subprocess could, therefore, represent a significant QCD background to J/psi+gamma decay of heavier charmonia. We also analyze the J/psi angular distribution in the J/psi+gamma rest frame.

arXiv comment7 pages LaTex, 4 figures available on request. CERN-TH.6974/93, ANL-HEP-PR-93.64

References in corpus (2)

• Looking for the gluonic EMC effect in associated $J/\psi$ + $\gamma$ production
• Shedding light on quarkonium formation by producing a photon in association

Cited by in corpus (4)

• New Observables in Inclusive Production of Quarkonia
• Real next-to-next-to-leading-order QCD corrections to J/psi and Upsilon hadroproduction in association with a photon
• Color-Octet Contributions in the Associate J/psi+gamma Hadroproduction
• Associated J/psi + gamma Photoproduction as a Probe of the Colour-Octet Mechanism