The Drell-Yan and J/psi source 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 source 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.

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

BEOLE', Stefania;CHIAVASSA, Emilio Luciano;GALLIO, Mauro;MASERA, Massimo;VERCELLIN, Ermanno;
1997-01-01

Abstract

The Drell-Yan and J/psi source 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 source 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.
1997
410
337
343
M.C. Abreu;B. Alessandro;C. Alexa;J. Astruc;C. Baglin;A. Baldit;M. Bedjidian;F. Bellaiche;S. Beolè;V. Boldea;G. Bonazzola;P. Bordalo;A. B...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/108328
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