Centrality, rapidity, and transverse-momentum dependence of cold nuclear matter effects on J/psi production in dAu, CuCu, and AuAu collisions at sq root(s{sub NN})=200 GeV

Journal Article · Tue Jun 15 04:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.064911· OSTI ID:21388629

Ferreiro, E G ^[1]; Fleuret, F ^[2]; Lansberg, J P ^[3]; Rakotozafindrabe, A ^[4]

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1. Departamento de Fisica de Particulas, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela (Spain)
2. Laboratoire Leprince Ringuet, Ecole polytechnique, CNRS/IN2P3, F-91128 Palaiseau (France)
3. Centre de Physique Theorique, Ecole polytechnique, CNRS, F-91128 Palaiseau (France)
4. IRFU/SPhN, CEA Saclay, F-91191 Gif-sur-Yvette Cedex (France)

We have carried out a wide study of cold nuclear matter (CNM) effects on J/psi production in dAu, CuCu and AuAu collisions at sq root(s{sub NN})=200 GeV. We have studied the effects of three different gluon-shadowing parametrizations, using the usual simplified kinematics for which the momentum of the gluon recoiling against the J/psi is neglected as well as an exact kinematics for a 2->2 process; namely g+g->J/psi+g as expected from LO pQCD. We have shown that the rapidity distribution of the nuclear modification factor R{sub dAu}, and particularly its antishadowing peak, is systematically shifted toward larger rapidities in the 2->2 kinematics, irrespective of which shadowing parametrization is used. In turn, we have noted differences in the effective final-state nuclear absorption needed to fit the PHENIX dAu data. Taking advantage of our implementation of 2->2 kinematics, we have also computed the transverse momentum dependence of the nuclear modification factor, which cannot be predicted with the usual simplified kinematics. All the corresponding observables have been computed for CuCu and AuAu collisions and compared to the PHENIX and STAR data. Finally, we have extracted the effective nuclear absorption from the recent measurements of R{sub CP} in dAu collisions by the PHENIX collaboration.

• OSTI ID: 21388629
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 81; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
BOSONS
CHARGED PARTICLES
CHARMONIUM
COLLISIONS
COPPER
DEUTERONS
DISTRIBUTION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
GEV RANGE
GEV RANGE 100-1000
GLUONS
GOLD
HADRONS
IMPLEMENTATION
J PSI-3097 MESONS
LINEAR MOMENTUM
MATTER
MESONS
METALS
MODIFICATIONS
NUCLEAR MATTER
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PARTICLE RAPIDITY
QUARKONIUM
SORPTION
TRANSITION ELEMENTS
TRANSVERSE MOMENTUM
VECTOR MESONS