Transverse momentum and transverse mass distributions of J/ψ mesons produced in p-A and Pb_Pb interactions at the CERN SPS

A B Kurepin, B Alessandro,C Alexa,R Arnaldi,M Atayan,C Baglin,A Baldit, M Bedjidian,S Beole, V Boldea,P Bordalo,S Borenstein,G Borges,A Bussiere,L Capelli,C Castanier,J Castor,B Chaurand,B Cheynis, E Chiavassa,C Cicalo,T Claudino,M P Comets,Serban Constantinescu,P Cortese,J Cruz,A De Falco,N De Marco,G Dellacasa,A Devaux, S Dita,O Drapier,B Espagnon,J Fargeix,P Force,M Gallio,Y K Gavrilov,C Gerschel,P Giubellino, M Golubeva,M Gonin,A A Grigorian,S Grigorian,J Y Grossiord,F Guber,A Guichard,H Gulkanyan,R Hakobyan,R Haroutunian,M Idzik,D Jouan,T L Karavitcheva,L Kluberg,Y Le Bornec,Carlos Lourenco,P Macciotta,M Mac Cormick, A Marzarichiesa,M Masera, A Masoni,M Monteno,A Musso,P Petiau,A Piccotti,J R Pizzi,W L Prado Da Silva,F Prino,G Puddu,C Quintans,L Ramello,S Ramos,P Rato Mendes,L Riccati,A Romana,H Santos,P Saturnini,Enrico Scalas,E Scomparin,S Serci,R Shahoyan,F Sigaudo,M Sitta,P Sonderegger,X Tarrago,N S Topilskaya,G Usai,E Vercellin,L Villatte,N Willis,Tao Wu

Nuclear Physics A（2003）

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摘要

We present a study of the transverse momentum and transverse mass of Jψ mesons produced in nucleus-nucleus and p-nucleus reactions. They include the most recent data collected by the NA50 experiment in PbPb and p-A reactions at 158 GeV/c and 400 GeV/c incident momentum respectively. Together with S-U results previously published by experiment NA38, the mean squared transverse momentum of Jψ mesons exhibit a scaling behaviour which could result from initial state parton interaction. However, for the most central PbPb collisions a saturation effect is observed as a function of centrality.

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