J/psi Suppression at Forward Rapidity in Au+Au Collisions at s_NN=200 GeV

Journal Article · Sat Jan 01 04:00:00 EST 2011 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.84.054912· OSTI ID:1029564

Adare, A. ^[1]; Awes, Terry C ^[2]; Cianciolo, Vince ^[2]; Efremenko, Yuri V ^[2]; Read, Jr, Kenneth F ^[2]; Silvermyr, David O ^[2]; Stankus, Paul W ^[2]; Young, Glenn R ^[2]

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1. University of Colorado, Boulder
2. ORNL

Heavy quarkonia are observed to be suppressed in relativistic heavy ion collisions relative to their production in p+p collisions scaled by the number of binary collisions. In order to determine if this suppression is related to color screening of these states in the produced medium, one needs to account for other nuclear modifications including those in cold nuclear matter. In this paper, we present new measurements from the PHENIX 2007 data set of J/! yields at forward rapidity (1.2 < |y| < 2.2) in Au+Au collisions at !sNN = 200 GeV. The data confirm the earlier finding that the suppression of J/psi at forward rapidity is stronger than at midrapidity, while also extending the measurement to finer bins in collision centrality and higher transverse momentum (pT ). We compare the experimental data to the most recent theoretical calculations that incorporate a variety of physics mechanisms including gluon saturation, gluon shadowing, initial-state parton energy loss, cold nuclear matter breakup, color screening, and charm recombination. We find J/psi suppression beyond cold-nuclearmatter effects. However, the current level of disagreement between models and d+Au data precludes using these models to quantify the hot-nuclear-matter suppression.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1029564
• Journal Information: Physical Review C, Journal Name: Physical Review C Journal Issue: 5 Vol. 84; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
74 ATOMIC AND MOLECULAR PHYSICS
COLOR
GLUONS
HEAVY IONS
MODIFICATIONS
NUCLEAR MATTER
PARTICLE RAPIDITY
PRODUCTION
PROTON-PROTON INTERACTIONS
RECOMBINATION
SATURATION
TRANSVERSE MOMENTUM