J/psi+gamma production at the LHC

Abstract

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.

arXiv comment9 pages, LaTeX, 6 ps figures, Minor changes, Version to appear in Physical Review D

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Cited by in corpus (14)

• New Observables in Inclusive Production of Quarkonia
• Accessing the Transverse Dynamics and Polarization of Gluons inside the Proton at the LHC
• Next-to-Leading-Order QCD corrections to J/ψ(Υ)+γproduction at the LHC
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• Hunting eta_b through radiative decay into J/psi
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• Spin physics and TMD studies at A Fixed-Target ExpeRiment at the LHC (AFTER@LHC)
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