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

A new data presentation is proposed in order to consider anomalous J/Ψ 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/Ψ 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/Ψ 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.