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

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.
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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. Borhani;A. Bussière;V. Capony;J. Castor;T. Chambon;B. Chaurand;I. Chevrot;B. Cheynis;E. Chiavassa;C. Cicaló;S. Constantinescu;J. Cruz;W. Dabrowski;A. De Falco;G. Dellacasa;N. De Marco;A. Devaux;S. Dita;O. Drapier;B. Espagnon;J. Fargeix;F. Fleuret;P. Force;M. Gallio;L. Gatignon;Y.K. Gavrilov;C. Gerschel;P. Giubellino;M.B. Golubeva;M. Gonin;P. Gorodetzky;J.Y. Grossiord;P. Guaita;F.F. Guber;A. Guichard;R. Haroutunian;M. Idzik;D. Jouan;T.L. Karavitcheva;L. Kluberg;A.B. Kurepin;G. Landaud;Y. Lebornec;C. Lourenço;L. Luquin;P. Macciotta;A. Marzari-Chiesa;M. Masera;A. Masoni;S. Mourgues;A. Musso;F. Ohlsson-Malek;P. Petiau;A. Piccotti;J.R. Pizzi;W.L. Prado Da Silva;G. Puddu;C. Quintans;C. Racca;L. Ramello;S. Ramos;P. Rato-Mendes;L. Riccati;A. Romana;S. Sartori;P. Saturnini;E. Scomparin;S. Serci;S. Silva;C. Soave;P. Sonderegger;X. Tarrago;P. Temnikov;N.S. Topilskaya;G. Usai;C. Vale;E. Vercellin;N. Willis
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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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