%0 Journal Article %1 Brodsky2010HeavyQuarkonium %A Brodsky, Stanley J. %A Lansberg, Jean-Philippe %D 2010 %K heavy, production %T Heavy-Quarkonium Production in High Energy Proton-Proton Collisions at RHIC %U http://arxiv.org/abs/0908.0754 %X 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.

@article{Brodsky2010HeavyQuarkonium, abstract = {{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.}}, added-at = {2019-02-23T22:09:48.000+0100}, archiveprefix = {arXiv}, author = {Brodsky, Stanley J. and Lansberg, Jean-Philippe}, biburl = {https://www.bibsonomy.org/bibtex/2a1bf29d0146019edd4df37bd91ea4af1/cmcneile}, citeulike-article-id = {5390688}, citeulike-linkout-0 = {http://arxiv.org/abs/0908.0754}, citeulike-linkout-1 = {http://arxiv.org/pdf/0908.0754}, day = 16, eprint = {0908.0754}, interhash = {3dbbbc525ff731b277de2866d83cc12a}, intrahash = {a1bf29d0146019edd4df37bd91ea4af1}, keywords = {heavy, production}, month = feb, posted-at = {2009-08-07 10:04:09}, priority = {3}, timestamp = {2019-02-23T22:15:27.000+0100}, title = {{Heavy-Quarkonium Production in High Energy Proton-Proton Collisions at RHIC}}, url = {http://arxiv.org/abs/0908.0754}, year = 2010 }