Abstract
We present preliminary results on J/ϕ production in Pb-Pb collisions at 158 GeV/nucleon, obtained in the analysis of the most recent data sample collected by NA50 experiment in year 2000. The results are compared with an updated absorption curve deduced from new high statistics protonnucleus data. The measurements reported here confirm the anomalous J/ϕ suppression already observed by NA50 from previously collected data samples.
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The NA50 Collaboration: B. Alessandro,11 C. Alexa,4 R. Arnaldi,11 M. Atayan,13 C. Baglin,2 A. Baldit,3 M. Bedjidian,12 S. Beolè,11 V. Boldea,4 P. Bordalo,7,a S.R. Borenstein,10,b G. Borges,7 A. Bussière,2 L. Capelli,12 C. Castanier,3 J. Castor,3 B. Chaurand,10 B. Cheynis,12 E. Chiavassa,11 C. Cicalò,5 T. Claudino,7 M.P. Comets,9 S. Constantinescu,4 P. Cortese,1 J. Cruz,7 A. DeFalco,5 N. DeMarco,11 G. Dellacasa,1 A. Devaux,3 S. Dita,4 O. Drapier,10 B. Espagnon,3 J. Fargeix,3 P. Force,3 M. Gallio,11 Y.K. Gavrilov,8 C. Gerschel,9 P. Giubellino,11,c M.B. Golubeva,8 M. Gonin,10 A.A. Grigorian,13 S. Grigorian,13 J.Y. Grossiord,12 F.F. Guber,8 A. Guichard,12 H. Gulkanyan,13 R. Hakobyan,13 R. Haroutunian,12 M. Idzik,11,d D. Jouan,9 T.L. Karavitcheva,8 L. Kluberg,10 A.B. Kurepin,8 Y. Le Bornec,9 C. Lourenço,6 P. Macciotta,5 M. MacCormick,9 A. Marzari-Chiesa,11 M. Masera,11 A. Masoni,5 M. Monteno,11 A. Musso,11 P. Petiau,10 A. Piccotti,11 J.R. Pizzi,12 W.L. Prado da Silva,11,e F. Prino,1 G. Puddu,5 C. Quintans,7 L. Ramello,1 S. Ramos,7,a P. Rato Mendes,7 L. Riccati,11 A. Romana,10 H. Santos,7 P. Saturnini,3 E. Scalas1 E. Scomparin,11 S. Serci,5 R. Shahoyan,7,f F. Sigaudo,11 M. Sitta,1 P. Sonderegger,6,a X. Tarrago,9 N.S. Topilskaya,8 G.L. Usai,5 E. Vercellin,11 L. Villatte,9 N. Willis9 and T. Wu9
Università del Piemonte Orientale, Alessandria and INFN-Torino, Italy
LAPP, CNRS-IN2P3, Annecy-le-Vieux, France
PC, Univ. Blaise Pascal and CNRS-IN2P3, Aubière, France
IFA, Bucharest, Romania
Università di Cagliari/INFN, Cagliari, Italy
CERN, Geneva, Switzerland
LIP, Lisbon, Portugal
INR, Moscow, Russia
IPN, Univ. de Paris-Sud and CNRS-IN2P3, Orsay, France
Laboratoire Leprince-Ringuet, Ecole Polytechnique and CNRS-IN2P3 Palaiseau, France
Università di Torino/INFN, Torino, Italy
IPN, Univ. Claude Bernard Lyon-I and CNRS-IN2P3, Villeurbanne, France
YerPhI, Yerevan, Armenia
Also at IST, Universidade Técnica de Lisboa, Lisbon, Portugal
On leave of absence from York College, CUNY, New York, USA
Also at CERN, Geneva, Switzerland
Also at Faculty of Physics and Nuclear Techniques, University of Mining and Metallurgy, Cracow, Poland
Now at UERJ, Rio de Janeiro, Brazil
On leave of absence from YerPhI, Yerevan, Armenia
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Borges, G., the NA50 Collaboration. Latest results on J/ϕ suppression. Acta Phys. Hung. A 21, 341–347 (2004). https://doi.org/10.1556/APH.21.2004.2-4.37
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DOI: https://doi.org/10.1556/APH.21.2004.2-4.37