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Evidence for deconfinement of quarks and gluons from the J / psi suppression pattern measured in Pb + Pb collisions at the CERN SPS.

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: M. C. Abreu, B. Alessandro, C. Alexa, et. al, NA50 Collaboration

Editorial: Physics Letters, B 477, p.28-36, 2000.


The analysis of the data collected by the NA50 experiment in 1998, reported in this paper, extends and clarifies the pattern of the previously observed J/Psi; anomalous suppression. This new measurement, besides providing a deeper understanding of the previous observations, reveals a steady significative decrease in the J/Psi; production rate up to the most central Pb-Pb collisions. It clearly rules out the presently available conventional (hadronic) models of J/Psi; suppression, which unanimously predict a saturation of the J/Psi; rate for central Pb-Pb collisions. On the contrary and together with the sharp onset of the anomalous suppression previously reported, the new observation leads to a global production rate pattern which finds its natural explanation in the framework of the formation of a deconfined state of quarks and gluons.

Cuvinte cheie: deconfinarea cuarcilor si gluonilor in ciocnirile ionilor grei relativisti // quarks and gluons deconfinement in heavy ion collision