Another look at anomalous J/Psi suppression in Pb+Pb collisions at P/A = 158 GeV/c

Abstract

A new data presentation is proposed to consider anomalous $J/\hat{I}¨$ suppression in Pb + Pb collisions at $P/A=158$ GeV/c. If the inclusive differential cross section with respect to a centrality variable is available, one can plot the yield of J/Psi events per Pb-Pb collision as a function of an estimated squared impact parameter. Both quantities are raw experimental data and have a clear physical meaning. As compared to the usual J/Psi over Drell-Yan ratio, there is a huge gain in statistical accuracy. This presentation could be applied advantageously to many processes in the field of nucleus-nucleus collisions at various energies.

6 pages, 5 figures, submitted to The European Physical Journal C; minor revisions for final version