Hadron physics with CERES: Spectra and collective flow

Ceretto, F.; Agakichiev, G.; Appelshäuser, H.; Baur, Roland; Braun‐Munzinger, P.; Cherlin, A.; Ernst, P.; Esumi, S.; Faschingbauer, U.; Fraenkel, Z.; Fuchs, C.; Gatti, E.; Glässel, P.; Heros, C. Pérez de los; Hering, G.; Holl, P.; Jung, Ch.; Lenkeit, B.; Marı́n, A.; Messer, M.; Miśkowiec, D.; Nix, O.; Panebrattsev, Y.; Pfeiffer, A.; Rak, J.; Ravinovich, I.; Razin, S. V.; Řehák, P.; Richter, Matthias; Sampietro, Marco; Saveljić, N.; Schmitz, W.; Schukraft, J.; Seipp, W.; Sharma, A.; Shimanskiy, S. S.; Socol, E.; Specht, H. J.; Stachel, J.; Stiller, P.; Tel-Zur, G.; Tilsner, H.; Tserruya, I.; Ullrich, T.; Voigt, Christiane; Voloshin, S.; Weber, C.; Wessels, J. P.; Wienold, T.; Windelband, B.; Wurm, J.P.; Yurevich, V. I.

doi:10.1016/s0375-9474(98)00383-2

Cited by 24 publications

(14 citation statements)

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“…However, it deviates from the most central collision hybrid fit as soon as the LHC measurements are included. The power-law fit to the centrality data are much closer to the hybrid fits, and it is almost indistinguish- [28], ATLAS [27], and CMS [26] experiments; the AuAu measurements at RHIC by BRAHMS [29], PHENIX [30,31], PHOBOS [25], and STAR [32,33] experiments; the values recalculated in [30] from the measurements at CERN SPS by CERES/NA45 [34] and NA49 [35,36] experiments, at Fermilab AGS by E802 [37] and E917 [38] experiments, and at GSI by FOPI Collab. [39] (estimated in [30]).…”

Section: Inmentioning

confidence: 85%

Effective-energy budget in multiparticle production in nuclear collisions

et al. 2014

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The dependencies of charged particle pseudorapidity density and transverse energy pseudorapidity density at midrapidity on the collision energy and on the number of nucleon participants, or centrality, measured in nucleusnucleus collisions are studied in the energy range spanning a few GeV to a few TeV per nucleon. The approach in which the multiparticle production is driven by the dissipating effective energy of participants is introduced. This approach is based on the earlier proposed consideration, combining the constituent quark picture together with Landau relativistic hydrodynamics shown to interrelate the measurements from different types of collisions. Within this picture, the dependence on the number of participants in heavy-ion collisions are found to be well described in terms of the effective energy defined as a centrality-dependent fraction of the collision energy. For both variables under study, the effective-energy approach reveals a similarity in the energy dependence obtained for the most central collisions and centrality data in the entire available energy range. Predictions are made for the investigated dependencies for the forthcoming higher-energy measurements in heavy-ion collisions at the LHC. 1.Multiparticle production in high-energy particle and nuclear collisions attracts high interest, as, on the one hand, the observables measured first in high-energy collisions, namely multiplicity and transverse energy, are immediate characteristics of this process and bring important information on the underlying dynamics of strong interactions, while on the other hand, this process still eludes its complete understanding. It is already more than half a century as the multia e-mail: Aditya.Nath.Mishra@cern.ch b e-mail: Raghunath.Sahoo@cern.ch c e-mail: sedward@mail.cern.ch d e-mail: Alexandre.Sakharov@cern.ch plicity of the produced particles are considered to be derived by the collision energy [1][2][3]. In this picture the energy pumped into the collision zone in the very first stage of the collision defines the volume of the interaction lump of participant patterns. Later on, the approach of "wounded" nucleons, or nucleon participants, has been proposed to describe the multiplicity and particle distributions [4]; for a review, see [5]. In this approach the multiplicity is expected to be proportional to the number of participants. However, it was observed at RHIC and similarly at LHC energies, the concept of wounded nucleons does not describe the measurements where the data found to demonstrate an increase with the number of nucleon participants. The problem has been addressed in the nuclear overlap model using Monte Carlo simulation in the constituent quark framework, and the scaling has been shown to be restored [6][7][8][9][10][11]. In addition, it was observed that the multiplicity and midrapidity-density distributions are similar in e + e − and in the most central (headon) nuclear collisions [12] at the same center-of-mass (c.m.) energy pointing to the universality of multihadron pro...

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Section: Inmentioning

confidence: 85%

Effective-energy budget in multiparticle production in nuclear collisions

et al. 2014

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“…Data on p t distributions of pions have been measured by CERES [92,93], NA49 [94], NA44 [95], and WA98 [96]. They are exceptional in that they can not be described by + e − -pair production in Pb-Au collisions at 158 GeV/nucleon…”

Section: Hadronic Decay Sourcesmentioning

confidence: 99%

e + e--pair production in Pb-Au collisions at 158 GeV per nucleon

Agakichiev¹,

Appelshäuser²,

Bielčíková³

et al. 2005

Eur. Phys. J. C

124

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Abstract. We present the combined results on electron-pair production in 158 GeV/n Pb-Au ( √ s= 17.2 GeV) collisions taken at the CERN SPS in 1995 and 1996, and give a detailed account of the data analysis. The enhancement over the reference of neutral meson decays amounts to a factor of 2.31±0.19 (stat.) ± 0.55 (syst.) ± 0.69 (decays) for semi-central collisions (28% σ/σgeo) when yields are integrated over m > 200 MeV/c 2 in invariant mass. The measured yield, its stronger-than-linear scaling with N ch , and the dominance of low pair pt strongly suggest an interpretation as thermal radiation from pion annihilation in the hadronic fireball. The shape of the excess centring at m ≈ 500 MeV/c 2 , however, cannot be described without strong medium modifications of the ρ meson. The results are put into perspective by comparison to predictions from Brown-Rho scaling governed by chiral symmetry restoration, and from the spectral-function many-body treatment in which the approach to the phase boundary is less explicit.

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“…Apart from a normalization factor which does not concern us here the expression for transverse mass spectra then reads: Comparison of (+) -(-) spectra for Pb+Au collisions with predictions of the random walk model for different centralities (increasing centrality from bottom to top). The data are from the CERES collaboration [14].…”

Section: Random Walkmentioning

confidence: 99%

“…(6) with recent data on "proton" transverse momentum distributions, i.e. the difference of the spectral distributions of positively and negatively charged particles, from the CERES collaboration [14]. These data for Pb+Au collisions were recorded with a multiplicity trigger corresponding to the upper 35 % of the geometrical cross section.…”

Section: Random Walkmentioning

confidence: 99%