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Title: J/{psi} production in Au+Au and Cu+Cu collisions at {radical}(s){sub NN}=200 GeV and the threshold model

Abstract

Using the quark gluon plasma (QGP) motivated threshold model, where all the J/{psi}'s are suppressed above a threshold density, we have analyzed the recent PHENIX data on the participant number dependence of the nuclear modification factor for J/{psi}'s, in Au+Au collisions, at RHIC energy, {radical}(s){sub NN}=200 GeV. Centrality dependence of midrapidity J/{psi} suppression in Au+Au collisions are well explained in the model for threshold density n{sub c}{approx_equal}3.6 fm{sup -2}. PHENIX data on J/{psi} suppression at forward rapidity data are not explained in the model. The analysis strongly supports deconfined matter formation in central Au+Au collisions at midrapidity. We have also analyzed the preliminary PHENIX data on J/{psi} suppression in Cu+Cu collisions. Cu+Cu data are not explained in the threshold model.

Authors:
 [1]
  1. Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata 700 064 (India)
Publication Date:
OSTI Identifier:
20995221
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.75.044902; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BROOKHAVEN RHIC; COLLISIONS; DENSITY; GEV RANGE 100-1000; INHIBITION; J PSI-3097 MESONS; PARTICLE RAPIDITY; QUARK MATTER

Citation Formats

Chaudhuri, A. K. J/{psi} production in Au+Au and Cu+Cu collisions at {radical}(s){sub NN}=200 GeV and the threshold model. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.044902.
Chaudhuri, A. K. J/{psi} production in Au+Au and Cu+Cu collisions at {radical}(s){sub NN}=200 GeV and the threshold model. United States. doi:10.1103/PHYSREVC.75.044902.
Chaudhuri, A. K. Sun . "J/{psi} production in Au+Au and Cu+Cu collisions at {radical}(s){sub NN}=200 GeV and the threshold model". United States. doi:10.1103/PHYSREVC.75.044902.
@article{osti_20995221,
title = {J/{psi} production in Au+Au and Cu+Cu collisions at {radical}(s){sub NN}=200 GeV and the threshold model},
author = {Chaudhuri, A. K.},
abstractNote = {Using the quark gluon plasma (QGP) motivated threshold model, where all the J/{psi}'s are suppressed above a threshold density, we have analyzed the recent PHENIX data on the participant number dependence of the nuclear modification factor for J/{psi}'s, in Au+Au collisions, at RHIC energy, {radical}(s){sub NN}=200 GeV. Centrality dependence of midrapidity J/{psi} suppression in Au+Au collisions are well explained in the model for threshold density n{sub c}{approx_equal}3.6 fm{sup -2}. PHENIX data on J/{psi} suppression at forward rapidity data are not explained in the model. The analysis strongly supports deconfined matter formation in central Au+Au collisions at midrapidity. We have also analyzed the preliminary PHENIX data on J/{psi} suppression in Cu+Cu collisions. Cu+Cu data are not explained in the threshold model.},
doi = {10.1103/PHYSREVC.75.044902},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 75,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}
  • It is shown that a quantum chromodynamics-based nuclear absorption model, with few parameters fixed to reproduce experimental J/{psi} yield in 200 GeV proton-proton/proton-nucleon and 450 GeV proton-nucleon collisions, can explain the preliminary PHENIX data on the centrality dependence of J/{psi} suppression in Cu+Cu collisions at Relativistic Heavy Ion Collider (RHIC) energy, {radical}(s{sub NN})=200 GeV. However, the model does not give a satisfactory description for the preliminary PHENIX data on the centrality dependence of J/{psi} suppression in Au+Au collisions. The analysis suggests that in Au+Au collisions, J/{psi} are suppressed in a medium unlike the medium produced in CERN Super Proton Synchrotronmore » energy nuclear collisions or in RHIC energy Cu+Cu collisions.« less
  • The PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC)has measured J/{psi} production for rapidities -2.2<y<2.2 in Au+Au collisions at {radical}(s{sub NN})=200 GeV. The J/{psi} invariant yield and nuclear modification factor R{sub AA} as a function of centrality,transverse momentum, and rapidity are reported. A suppression of J/{psi} relative to binary collision scaling of proton-protonreaction yields is observed. Models which describe the lower energy J/{psi} data at the CERN Super Proton Synchrotron invoking only J/{psi} destruction based on the local medium density predicta significantly larger suppression at RHIC and more suppression at midrapiditythan at forward rapidity. Both trends are contradictedmore » by our data.« less
  • The STAR Collaboration at the Relativistic Heavy Ion Collider presents measurements of J/{psi} {yields} e{sup +}e{sup -} at midrapidity and high transverse momentum (p{sub T} > 5 GeV/c) in p+p and central Cu+Cu collisions at {radical}s{sub NN} = 200 GeV. The inclusive J/{psi} production cross section for Cu+Cu collisions is found to be consistent at high p{sub T} with the binary collision-scaled cross section for p+p collisions. At a confidence level of 97%, this is in contrast to a suppression of J/{psi} production observed at lower p{sub T}. Azimuthal correlations of J/{psi} with charged hadrons in p+p collisions provide anmore » estimate of the contribution of B-hadron decays to J/{psi} production of 13% {+-} 5%.« less
  • Yields for J/{psi} production in Cu+Cu collisions at {radical}(s{sub NN})=200 GeV have been measured over the rapidity range |y|<2.2 and compared with results in p+p and Au+Au collisions at the same energy. The Cu+Cu data offer greatly improved precision over existing Au+Au data for J/{psi} production in collisions with small to intermediate numbers of participants, in the range where the quark-gluon plasma transition threshold is predicted to lie. Cold nuclear matter estimates based on ad hoc fits to d+Au data describe the Cu+Cu data up to N{sub part}{approx}50, corresponding to a Bjorken energy density of at least 1.5 GeV/fm{sup 3}.