Results on leptonic probes from NA50

Alessandro, B.; Alexa, C.; Arnaldi, R.; Atayan, M.; Baglin, C.; Baldit, A.; Bedjidian, M.; Beolè, S.; Boldea, V.; Bordalo, P.; Borenstein, S.; Borges, G.; Bussiére, A.; Capelli, L; Castanier, C.; Castor, J.; Chaurand, B.; Cheynis, B.; Chiavassa, E.; Cicalò, C.; Claudino, T.; Comets, M. P.; Constantinescu, S.; Cortese, P.; Cruz, J.; Defalco, A.; DeMarco, N; Dellacasa, G.; Devaux, A.; Diţǎ, S.; Drapier, O.; Espagnon, B.; Fargeix, J.; Force, P.; Gallio, M.; Gavrilov, Y.K.; Gerschel, C.; Giubellino, P.; Golubeva, M.; Gonin, M.; Grigorian, A.A.; Grigorian, S.; Grossiord, J.‐Y.; Guber, F.F.; Guichard, A.; Gulkanyan, H.; Hakobyan, R.; Haroutunian, R.; Idzik, M.; Jouan, D.; Karavitcheva, T.L.; Kluberg, L.; Kurepin, A.B.; Bornec, Y. Le; Lourenço, C.; Macciotta, P.; Cormick, M. Mac; Marzari‐Chiesa, A.; Masera, M.; Masoni, A.; Monteno, M.; Musso, A.; Petiau, P.; Piccotti, A.; Pizzi, J.R.; Silva, W.L. Prado da; Prino, F.; Puddu, G.; Quintans, C.; Ramello, L.; Ramos, S.; Mendes, P. Rato; Riccatoi, L.; Romana, A.; Santos, H.; Saturnini, P.; Scalas, Enrico; Scomparin, E.; Serci, S.; Shahoyan, R.; Sigaudo, F.; Sitta, M.; Sonderegger, P.; Tarrago, X.; Topilskaya, N.; Usai, G. L.; Vercellin, E.; Villatte, L.; Willis, N.; Wu, T.

doi:10.1016/s0375-9474(02)01432-x

Cited by 43 publications

(23 citation statements)

References 8 publications

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“…First, at forward rapidity J/ψ is more suppressed than at midrapidity. Second, the dependence of J/ψ suppression at midrapidity on the number of participants N part [5,6] coincides with the one observed at SPS Pb-Pb collisions by the NA50 experiment [7]. Two different mechanisms to explain those RHIC data are usually considered in the literature: recombination [8,9,10,11] or statistical coalescence [12,13,14,15] and nuclear effects [16,17,18].…”

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confidence: 52%

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Charmonium suppression at RHIC and SPS: A hadronic baseline

2010

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A kinetic equation approach is applied to model anomalous J/ψ suppression at RHIC and SPS by absorption in a hadron resonance gas which successfully describes statistical hadron production in both experiments. The puzzling rapidity dependence of the PHENIX data is reproduced as a geometric effect due to a longer absorption path for J/ψ production at forward rapidity.Keywords: J/ψ suppression, heavy-ion collisions, hadron gas PACS: 14.40.Gx, 24.10.Pa, 25.75.-q IntroductionThe effect of J/ψ suppression [1] is one of the diagnostic tools to prove quark-gluon plasma (QGP) formation in heavy-ion collisions. After a rich phenomenology provided by the CERN-SPS experiments NA3, NA38, NA50 and NA60, which nevertheless could not unambiguously prove QGP formation, the situation became even more complex due to first results from RHIC experiments PHENIX and STAR. New experiments are planned at CERN-LHC and FAIR-CBM, for a recent review, see [2]. In order to make progress in the interpretation of experimental findings it is important to define benchmarks, such as a baseline from a statistical kinetic model provided in this communication, which is based on a purely hadronic description.Measurements of J/ψ suppression in Au-Au and Cu-Cu collisions by STAR and PHENIX experiments [3,4,5] brought up two unexpected re-

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confidence: 52%

“…With T 0 known the initial entropy density s 0 is calculated. Having put s 0 into (7) and with the use of the grand canonical expressions for s we can obtain T (τ ). It turned out that T (τ ) has the form given by (10) with a varying in the range a = 0.148 − 0.156 for ǫ 0 in the range ǫ 0 = 5.5 − 0.5 GeV/fm 3 .…”

Section: J/ψ Absorptionmentioning

confidence: 99%

Charmonium suppression at RHIC and SPS: A hadronic baseline

2010

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“…For charmonia, an interplay of thermal suppression and regeneration reactions throughout the evolution of the fireball formed in nuclear collisions turned out to provide a suitable framework to describe the observed production patterns from CERN Super Proton Synchrotron (SPS) energy (0.017 TeV) [7], via BNL Relativistic Heavy Ion Collider (RHIC) energy (0.039-0.2 TeV) [8,9], to CERN Large Hadron Collider (LHC) energy (2.76 TeV) [10], see also [11][12][13][14][15][16][17][18]. In particular, the relative enhancement of J/ψ yields when going from RHIC to the LHC was anticipated as a consequence of regeneration processes which intensify in the presence of larger charm-quark densities in the system.…”

Section: Introductionmentioning

confidence: 99%

Color screening and regeneration of bottomonia in high-energy heavy-ion collisions

2017

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The production of ground-state and excited bottomonia in ultrarelativistic heavy-ion collisions is investigated within a kinetic-rate equation approach including regeneration. We augment our previous calculations by an improved treatment of medium effects, with temperature-dependent binding energies and pertinent reaction rates, B-meson resonance states in the equilibrium limit near the hadronization temperature, and a lattice-QCD based equation of state for the bulk medium. In addition to the centrality dependence of the bottomonium yields we compute their transverse-momentum (pT ) spectra and elliptic flow with momentum-dependent reaction rates and a regeneration component based on b-quark spectra from a nonperturbative transport model of heavy-quark diffusion. The latter has noticeable consequences for the shape of the bottomonium pT spectra. We quantify how uncertainties in the various modeling components affect the predictions for observables. Based on this we argue that the Υ(1S) suppression is a promising observable for mapping out the in-medium properties of the QCD force, while Υ(2S) production can help to quantify the role of regeneration from partially thermalized b quarks.

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“…(Color online) Results of the thermal rate-equation approach for J/ψ production (normalized to Drell-Yan pairs) versus centrality at SPS, compared to NA50 data[68,69]. Solid lines: total J/ψ yield; dashed lines: suppressed primordial production; dot-dashed lines: regeneration component; dotted lines: primordial production with CNM effects only.…”

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confidence: 99%

Charmonium in medium: From correlators to experiment

2010

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We set up a framework in which in-medium charmonium properties are constrained by thermal lattice quantum chromodynamics and subsequently implemented into a thermal rate equation enabling the comparison with experimental data in heavy-ion collisions. Specifically, we evaluate phenomenological consequences for charmonium production originating from two different scenarios in which either the free or the internal energy are identified with the in-medium two-body potential between charm and anticharm quarks. These two scenarios represent J /ψ "melting temperatures" of approximately 1.25T c ("weak binding") and 2T c ("strong binding"), respectively. Within current uncertainties in dissociation rates and charm-quark momentum spectra, both scenarios can reproduce the centrality dependence of inclusive J /ψ yields in nuclear collisions at the Super Proton Synchrotron (SPS) and the Relativistic Heavy-Ion Collider (RHIC) reasonably well. However, the "strong-binding" scenario associated with the internal energy as the potential tends to better reproduce current data on transverse momentum spectra at both SPS and RHIC.

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Results on leptonic probes from NA50

Cited by 43 publications

References 8 publications

Charmonium suppression at RHIC and SPS: A hadronic baseline

Charmonium suppression at RHIC and SPS: A hadronic baseline

Color screening and regeneration of bottomonia in high-energy heavy-ion collisions

Charmonium in medium: From correlators to experiment

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