QCD calculation of J/psi+gamma mass distributions

Details QCD calculation of J/psi+gamma mass distributions QCD calculation of J/psi+gamma mass distributions

1993-08-11

arxiv.org/abs/hep-ph/9308261v1

Phys.Lett.B317:443-448,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1016/0370-2693(93)91022-F

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.

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