RAA of J/ψ near midrapidity in heavy ion collisions at √sNN=200 GeV

Taesoo Song, Woosung Park, Su Houng Lee

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We build up a model to reproduce the experimentally measured RAA of J/ψ near midrapidty in an Au+Au collision at √sNN=200GeV. The model takes into account the J/ψ suppression from the quark-gluon plasma and hadron gas as well as the nuclear absorption of primordial charmonia and the regeneration effects at the hadronization stage and hence is a generalization of the two-component model introduced by Grandchamp and Rapp. The improvements in this work are twofold; the addition of the initial local temperature profile and a consistent use of QCD next-to-leading order (NLO) formula for both the dissociation cross section in the hadron gas and the thermal decay widths in the quark-gluon plasma for the charmonium states. The initial local temperature profile is determined from the assumption that the local entropy density is proportional to a formula involving the number densities of the number of participants and of the binary collisions that reproduces the multiplicities of charged particles at chemical freeze-out. The initial local temperature profile brings about a kink in the RAA curve due to the initial melting of J/ψ. The initially formed fireball, composed of weakly interacting quarks and gluons with thermal masses that are extracted from lattice QCD, follows an isentropic expansion with cylindrical symmetry. The fit reproduces well the Au+Au as well as the Cu+Cu data. The same method is applied to predict the RAA expected from the Pb+Pb collision at Large Hadron Collider (LHC) energy.

Original languageEnglish
Article number034914
JournalPhysical Review C - Nuclear Physics
Volume81
Issue number3
DOIs
Publication statusPublished - 2010 Mar 30

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ionic collisions
temperature profiles
quarks
collisions
quantum chromodynamics
fireballs
gluons
regeneration
gases
charged particles
melting
retarding
dissociation
entropy
expansion
cross sections
symmetry
decay
curves
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

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abstract = "We build up a model to reproduce the experimentally measured RAA of J/ψ near midrapidty in an Au+Au collision at √sNN=200GeV. The model takes into account the J/ψ suppression from the quark-gluon plasma and hadron gas as well as the nuclear absorption of primordial charmonia and the regeneration effects at the hadronization stage and hence is a generalization of the two-component model introduced by Grandchamp and Rapp. The improvements in this work are twofold; the addition of the initial local temperature profile and a consistent use of QCD next-to-leading order (NLO) formula for both the dissociation cross section in the hadron gas and the thermal decay widths in the quark-gluon plasma for the charmonium states. The initial local temperature profile is determined from the assumption that the local entropy density is proportional to a formula involving the number densities of the number of participants and of the binary collisions that reproduces the multiplicities of charged particles at chemical freeze-out. The initial local temperature profile brings about a kink in the RAA curve due to the initial melting of J/ψ. The initially formed fireball, composed of weakly interacting quarks and gluons with thermal masses that are extracted from lattice QCD, follows an isentropic expansion with cylindrical symmetry. The fit reproduces well the Au+Au as well as the Cu+Cu data. The same method is applied to predict the RAA expected from the Pb+Pb collision at Large Hadron Collider (LHC) energy.",
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RAA of J/ψ near midrapidity in heavy ion collisions at √sNN=200 GeV. / Song, Taesoo; Park, Woosung; Lee, Su Houng.

In: Physical Review C - Nuclear Physics, Vol. 81, No. 3, 034914, 30.03.2010.

Research output: Contribution to journalArticle

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