Author/Authors :
NA50 Collaboration، نويسنده , , Pierre Saturnini، 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 , , et al.، نويسنده ,
Abstract :
The threshold effect in the J/ψ suppression seen in the NA50 data in lead on lead interactions at the CERN SPS [1,2] canʹt be taken into account by conventional models. Other candidate models [3] use a phase transition, and therefore let suppose that the thermodynamic variables are defined everywhere that is the so-called thermalization. The in-plane elliptic flow, which has been proposed [4] in order to probe the thermalization at these beam energies, is found to be actually present in lead on lead interactions at 158A GeV/c, but canʹt be observed in sulphur on sulphur at 200A GeV/c in the NA38 data [5,6].
