J/psi+gamma production at the LHC

Details J/psi+gamma production at the LHC J/psi+gamma production at the LHC

1999-01-12

arxiv.org/abs/hep-ph/9901276v2

Phys.Rev.D60:014009,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, LaTeX, 6 ps figures, Minor changes, Version to appear in Physical Review D

Scientific paper

10.1103/PhysRevD.60.014009

The associated production of J/psi + gamma at the LHC is studied within the NRQCD framework. The signal we focus on is the production of a J/psi and an isolated photon produced back-to-back, with their transverse momenta balanced. It is shown that even for very large values of transverse momentum (pT of the order of 50 GeV) the dominant contribution to this process is not fragmentation. This is because of the fact that fragmentation-type contributions to the cross-section come from only a q q(bar) initial state, which is suppressed at the LHC. We identify gg-initiated diagrams higher-order in alpha(s) which do have fragmentation-type vertices. We find, however, that the contribution of these diagrams is negligibly small.

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