Results from the NA50 experiment on J/Ψ suppression in Pb-Pb collisions at the CERN SPS

被引：2

作者：

Monteno, M ^{[1
]}

Abreu, MC

Alessandro, B

Alexa, C

Arnaldi, R

Atayan, M

Baglin, C

Baldit, A

Bedjidian, M

Beolè, S

Boldea, V

Bordalo, P

Bussière, A

Capelli, L

Casagrande, L

Castor, J

Chambon, T

Chaurand, B

Chevrot, I

Cheynis, B

Chiavassa, E

Cicalò, C

Claudino, T

Comets, MP

Constans, N

Constantinescu, S

De Marco, N

Dellacasa, G

Devaux, A

Dita, S

Drapier, O

Espagnon, B

Fargeix, J

Force, P

Gallio, M

Gavrilov, YK

Gerschel, C

Giubellino, P

Golubeva, MB

Gonin, M

Grigorian, AA

Grossiord, JY

Guichard, A

Gulkanyan, H

Hakobyan, R

Haroutunian, R

Idzik, M

Jouan, D

Karavitcheva, TL

Kluberg, L

机构：

[1] LIP, P-1000 Lisbon, Portugal

[2] CNRS, IN2P3, LAPP, Annecy Le Vieux, France

[3] Univ Clermont Ferrand, LPC, Aubiere, France

[4] CNRS, IN2P3, Aubiere, France

[5] IFA, Bucharest, Romania

[6] Univ Cagliari, Ist Nazl Fis Nucl, Cagliari, Italy

[7] CERN, CH-1211 Geneva 23, Switzerland

[8] INR, Moscow, Russia

[9] Univ Paris 11, IPN, Orsay, France

[10] CNRS, IN2P3, Orsay, France

[11] Ecole Polytech, LPNHE, Palaiseau, France

[12] CNRS, IN2P3, Palaiseau, France

[13] Univ Turin, Ist Nazl Fis Nucl, Turin, Italy

[14] Univ Lyon 1, IPN, F-69622 Villeurbanne, France

[15] CNRS, IN2P3, Villeurbanne, France

[16] YerPhI, Yerevan, Armenia

[17] Univ Algarve, Unidad Ciencias Exactas & Humanas, P-8000 Faro, Portugal

[18] Univ Tecn Lisboa, Inst Super Tecn, P-1096 Lisbon, Portugal

来源：

NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2001年 / 92卷

关键词：

D O I：

10.1016/S0920-5632(00)01018-5

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The NA50 experiment has measured, at the CERN SPS: the dimuon production in Pb-Pb collisions at 158 GeV/c per nucleon, following the program of the previous NA38 and NA51 experiments, performed with proton and light ion beams. The J/psi production has been studied by NA50 as a function of the centrality of the collisions. The results of the analyses performed on three data samples, collected from 1995 to 1998 show that for peripheral collisions the J/Psi cross section can be understood in terms of ordinary nuclear absorption: consistently with the extrapolation of previous measurements extending from p-p to S-U. On the contrary, the central events show an anomalous J/Psi suppression, and the pattern of J/Psi yield versus centrality features two discontinuities that cannot be described by conventional models based on hadronic scenarios. These results can be considered as a strong indication of the creation of a new state of matter in central Pb-Pb collisions at the SPS.

引用

页码：43 / 54

页数：12

共 28 条

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