Author/Authors :
A.B. Kurepin، نويسنده , , B. Alessandro، نويسنده , , C. Alexa، نويسنده , , R. Arnaldi، نويسنده , , M. Atayan، نويسنده , , S. Beolè، نويسنده , , V. Boldea، نويسنده , , P. Bordalo، نويسنده , , José G. Borges، نويسنده , , C. Castanier، نويسنده , , J. Castor، نويسنده , , B. Chaurand، نويسنده , , B. Cheynis، نويسنده , , E. Chiavassa، نويسنده , , C. Cicaloʹ، نويسنده , , M.P. Comets، نويسنده , , S. Constantinescu، نويسنده , , P. Cortese، نويسنده , , F. A. de Falco، نويسنده , , N. De Marco، نويسنده , , et al.، نويسنده ,
Abstract :
Charmonium suppression in Pb-Pb collisions at 158 GeV/c per nucleon is investigated in detail with the study of the transverse momentum distributions of J/ψ as a function of the centrality of the collision. It is shown that the observed J/ψ suppression in Pb-Pb interactions is particularly significant mainly at low transverse momentum where it strongly depends on centrality. For peripheral Pb-Pb collisions, the transverse momentum dependence of the J/ψ cross section is, as a function of centrality, qualitatively similar to the dependence observed in p-A and S-U collisions. Comparing peripheral and central Pb-Pb collisions, the data show a relative suppression in the whole pT range although its amplitude significantly decreases with increasing pT and becomes almost pT independent for the highest pT values.
