Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-08-05
Phys.Rev.D81:051502,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 11 figures, LaTeX, version to appear as a Rapid Communication in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.81.051502
We update the study of the total Psi and Upsilon production cross section in proton-proton collisions at RHIC energies using the QCD-based Color-Singlet (CS) Model, including next-to-leading order partonic matrix elements. We also include charm-quark initiated processes which appear at leading order in alpha_s, but which have so far been overlooked in such studies. Contrary to earlier claims, we show that the CS yield is consistent with measurements over a broad range of J/Psi rapidities. We also find that charm-quark initiated processes, including both intrinsic and sea-like charm components, typically contribute at least 20% of the direct J/Psi yield, improving the agreement with data both for the integrated cross section and its rapidity dependence. The key signature for such processes is the observation of a charm-quark jet opposite in azimuthal angle phi to the detected J/Psi. Our results have impact on the proper interpretation of heavy-quarkonium production in heavy-ion collisions and its use as a probe for the quark-gluon plasma.
Brodsky Stanley J.
Lansberg Jean-Philippe
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