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# Anomalous J/psi suppression in Pb-Pb interactions at 158 GeV/c per nucleon

Physics Letters B 01/1997; 410:337-343. pp.337-343

ABSTRACT The Drell-Yan and J/psi cross-sections measured in Pb-Pb collisions are compared with the values extrapolated from the results obtained in proton and light ion induced reactions. While the Drell-Yan production exhibits the normal expected behaviour, the yield of J/psi in Pb-Pb interactions is abnormally low, as it lies 9 standard deviations below the expected value. Moreover, the departure from the expected behaviour increases significantly from peripheral to central collisions. (C) 1997 Elsevier Science B.V.

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