J/psi Absorption in Heavy Ion Collisions

Abstract

We present a new calculation of the pi-J/psi dissociation cross sections within the Constituent Quark-Meson Model recently introduced. To discuss the absorption of J/psi in heavy-ion collisions, we assume the J/psi to be produced inside a thermalized pion gas, as discussed by Bjorken, and introduce the corrections due to absorption by nuclear matter as well. We fit the absorption length of the J/psi to the data obtained at the CERN SPS by the NA50 Collaboration for Pb-Pb collisions. Collisions of lower centrality allow us to determine the temperature and the energy density of the pion gas. For both these quantities we find values close to those indicated by lattice gauge calculations for the transition to a quark-gluon plasma. A simple extrapolation to more central collisions, which takes into account the increase of the energy deposited due to the increased nucleon flux, fails to reproduce the break in J/psi absorption indicated by NA50, thus lending support to the idea that an unconfined quark-gluon phase may have been produced. This conclusion could be sharpened by analysing in a similar way, as a function of centrality, other observables such as strange particle production.

12 pages, 7 figures

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• First Measurement of $\Gamma (D\ast +)$
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• A Constituent Quark-Meson Model for Heavy-Meson Processes
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• J/psi Absorption in Heavy Ion Collisions II
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• Color Deconfinement and Charmonium Production in Nuclear Collisions
• Strong Couplings of X(3872)_{J=1,2} and a New Look at J/psi Suppression in Heavy Ion Collisions
• The dissociation of the J/psi by light mesons and chiral symmetry
• Temperature-dependent cross sections for charmonium dissociation in collisions with kaons and eta mesons in hadronic matter
• Correlating Strangeness Enhancement and J/psi Suppression in Heavy Ion Collisions at sqrt(s)_NN = 17.2 GeV
• Temperature-dependent Cross Sections for Charmonium Dissociation in Collisions with Pions and Rhos in Hadronic Matter
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• Dissociation Cross Sections of Large-Momentum Charmonia with Light Mesons in Hadronic Matter
• Heavy-quarkonium interaction in QCD at finite temperature
• Charmonium dissociation in collision with phi meson in hadronic matter