Heavy-Quarkonium Production in High Energy Proton-Proton Collisions at RHIC

Journal Article · Wed Dec 09 04:00:00 EST 2009 · Phys.Rev.D81:051502,2010

DOI:https://doi.org/10.1103/PhysRevD.81.051502· OSTI ID:969276

Brodsky, Stanley J; Lansberg, Jean-Philippe

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}{sub 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.

• Research Organization: SLAC National Accelerator Laboratory (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 969276
• Report Number(s): SLAC-PUB-13736; arXiv:0908.0754
• Journal Information: Phys.Rev.D81:051502,2010, Journal Name: Phys.Rev.D81:051502,2010
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
MATRIX ELEMENTS
PARTICLE RAPIDITY
PROBES
PRODUCTION
QUARK MATTER
Theory-Nucl
Phenomenology-HEP
HEPPH
HEPTH
OTHER