Author/Authors :
Corrado Cical?، نويسنده , , Everton M.C. Abreu، نويسنده , , B. Alessandro، نويسنده , , C. Alexa، نويسنده , , R. Arnaldi، نويسنده , , J. Astruc، نويسنده , , M. Atayan، نويسنده , , C. Baglin، نويسنده , , A. Baldit، نويسنده , , M. Bedjidian، نويسنده , , F. Bellaiche، نويسنده , , S. Beolè، نويسنده , , V. Boldea، نويسنده , , P. Bordalo، نويسنده , , A. Bussière، نويسنده , , L. Capelli، نويسنده , , V. Caponi، نويسنده , , L. Casagrande، نويسنده , , J. Castor، نويسنده , , T. Chambon، نويسنده , , et al.، نويسنده ,
Abstract :
The main goal of the NA50 experiment is to study the J/ψ suppression pattern in Pb-Pb interactions, at 158 GeV/c per nucleon at the CERN SPS. We present here the results from the 1996 (final) and 1998 (preliminary) data taking periods. They confirm and extend our previous observation that the J/ψ is anomalously suppressed from peripheral to central collisions. With new event selection procedures and different analysis techniques, we observe that in peripheral collisions the J/ψ cross section per nucleon-nucleon collision agrees with the pattern inferred from a wide range of measurements with lighter systems, from pp up to S-U. When the collisions become more central a clear departure from this behaviour is observed. The 1996 data show a sudden drop in the J/ψ production yield for ET values above 40 GeV, where ET is the neutral transverse electromagnetic energy released in the colision and measured in the EM calorimeter. The 1998 data provide a big improvement in the study of the most central region, where a second change in the pattern becomes visible.
