Searching for QGP: the J/ψ probe in the NA50/CERN experiment

Abreu, M.C.; Alessandro, B.; Alexa, C.; Arnaldi, R.; Atayan, M.; Baglin, C.; Baldit, A.; Bedjidian, M.; Beolè, S.; Boldea, V.; Bordalo, P.; Bussiére, A.; Capelli, L; Casagrande, Luca; Castor, J.; Chambon, T.; Chaurand, B.; Chevrot, I.; Cheynis, B.; Chiavassa, E.; Cicalò, C.; Claudino, T.; Comets, M. P.; Constans, N.; Constantinescu, S.; Marco, N. De; Falco, A. De; Dellacasa, G.; Devaux, A.; Diţǎ, S.; Drapier, O.; Ducroux, L.; Espagnon, B.; Fargeix, J.; Force, P.; Gallio, M.; Gavrilov, Y.K.; Gerschel, C.; Giubellino, P.; Golubeva, M.B.; Gonin, M.; Grigorian, A.A.; Grossiord, J. Y.; Guber, F.F.; Guichard, A.; Gulkanyan, H.; Hakobyan, R.; Idzik, M.; Jouan, D.; Karavitcheva, T.L.; Kluberg, L.; Kurepin, A.; Bornec, Y. Le; Lourenço, C.; Macciotta, P.; Cormick, M. Mac; Marzari‐Chiesa, A.; Masera, M.; Masoni, A.; Mehrabyan, S.; Monteno, M.; Musso, A.; Petiau, P.; Piccotti, A.; Pizzi, J.R.; Prino, F.; Puddu, G.; Quintans, C.; Ramos, S.; Ramello, L.; Mendes, P. Rato; Riccati, L.; Romana, A.; Ropotar, I.; Saturnini, P.; Scomparin, E.; Serci, S.; Silva, S.; Sitta, M.; Soave, C.; Sonderegger, P.; Tarrago, X.; Topilskaya, N.; Usai, G. L.; Vercellin, E.; Villatte, L.; Willis, N.

doi:10.1063/1.1345270

Cited by 166 publications

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“…(4) has been folded over the same space-time evolution (modulo centrality) underlying the results of Fig. 4 [26] compared to NA50 data [3]. Upper and lower total yields correspond to T0 = 195 MeV and 220 MeV, respectively.…”

Section: A Comparison To Datamentioning

confidence: 99%

“…hot and dense phases of strongly interacting matter could be realized. Indeed, an excess of radiation in central Pb(158AGeV)-Au and Pb(158AGeV)-Pb collisions as compared to baseline p-p and p-A measurements has consistently been observed, most prominently for electron pairs at low invariant mass (M ≤ 1 GeV) by CERES/NA45 [2], muon pairs at intermediate mass (1.5 GeV ≤ M ≤ 3 GeV) by NA50 [3] and photons at transverse momenta q t ∼ > 1.5 GeV by WA98 [4]. ¿From the theoretical side it should be emphasized that both dilepton and photon emission rates of a thermal medium are based on the same quantity, i.e., the (imaginary part of the) correlation function of the electromagnetic (e.m.) current (or photon selfenergy), Im Π em .…”

Section: Introductionmentioning

confidence: 99%

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Dileptons in high-energy heavy-ion collisions

Rapp

2003

Pramana - J Phys

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Section: A Comparison To Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dileptons in high-energy heavy-ion collisions

Rapp

2003

Pramana - J Phys

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“…In a recent 2 such work, it has been claimed [25] that the entire NA50 E T -spectrum of the J/ψ cross section ratio R can be explained using the co-mover picture. In fact, the second shoulder in the E T -behaviour observed [26] in the 1998 data and which could be due to QGP [27], has been explained in Ref. [25] as due to fluctuations at the tail of the E T -spectrum.…”

Section: J/ψ Suppressionmentioning

confidence: 99%

Quark-gluon plasma: Status of heavy ion physics

Gavai

2000

Pramana - J Phys

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Abstract. Lattice quantum chromodynamics (QCD), defined on a discrete space time lattice, leads to a spectacular non-perturbative prediction of a new state of matter, called quark-gluon plasma (QGP), at sufficiently high temperatures or equivalently large energy densities. The experimental programs of CERN, Geneva and BNL, New York of relativistic heavy ion collisions are expected to produce such energy densities, thereby providing us a chance to test the above prediction. After a brief introduction of the necessary theoretical concepts, I will present a critical review of the experimental results already obtained by the various experiments in order to examine whether QGP has already been observed by them.

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“…We will, for the following discussion, mainly focus on the dependence of J/ψ production on the number of participating nucleons. The shape of this dependence can be analyzed from published NA50 data [13][14][15]. The absolute normalization we obtained by using for N part = 100 that N J/ψ /N h− = 1.1·10 −6 [16], leading to N J/ψ /N part = 1.83 ·10 −6 .…”

Section: Statistical Hadronization Of Charmmentioning

confidence: 99%

“…Comparison of the dependence of the measured (J/ψ)/N part ratio on the number of participating nucleons with the predictions of the of the canonical direct/statistical model (solid line). The data are from a reanalysis of [13][14][15] and are normalized using the (J/ψ)/h − ratio deduced in [16]. For details, in particular about the normalization, see text.…”

Section: Statistical Hadronization Of Charmmentioning

confidence: 99%