Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-02-26
Nucl.Phys. A741 (2004) 273-286
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 7 figures
Scientific paper
10.1016/j.nuclphysa.2004.05.019
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.
Maiani Luciano
Piccinini Fulvio
Polosa Antonio Davide
Riquer Veronica
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