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25 April 2024

» arxiv » nucl-ex/0506002

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e+e--pair producrion in Pb-Au collisions at 158 GeV per nucleon
G.Agakichiev ; H.Appelshauser ; J.Bielcikova ; R.Baur ; P.Braun-Munzinger ; A.Cherlin ; S.Damjanovic ; A. Drees ; S.Esumi ; U.Faschingbauer ; Z.Fraenkel ; Ch.Fuchs ; E.Gatti ; P.Glassel ; G.Hering ; C.P.de los Heros ; P.Holl ; Ch.Jung ; B.Lenkeit ; A.Marin ; F.Messer ; M.Messer ; D.Miskowiec ; O.Nix ; Yu.Panebrattsev ; A.Pfeiffer ; J.Rak ; I.Ravinovich ; S.Razin ; P.Rehak ; M.RIchter ; M.Sampietro ; H.Sako ; N.Saveljic ; W.Schmitz ; J.Schukraft ; W.Seipp ; S.Shimanskiy ; E.Socol ; H.J.Specht ; J.Stachel ; G.Tel-Zur ; I.Tserruya ; T.Ullrich ; C.Voigt ; S.Voloshin ; C.Weber ; J.P.Wessels ; T.Wienold ; J.P.Wurm ; V.Yurevich ;
Date:	1 Jun 2005
Subject:	nucl-ex
Abstract:	We present the combined results on electron-pair production in 158 GeV/n {Pb-Au} ($sqrt{s}$= 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$pm0.19 (stat.)pm0.55 (syst.)pm0.69 (decays)$ for semi-central collisions (28% $sigma/sigma_{geo}$) 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 $p_t$ strongly suggest an interpretation as {it thermal radiation} from pion annihilation in the hadronic fireball. The shape of the excess centring at $mapprox$ 500 MeV/$c^2$, however, cannot be described without strong medium modifications of the $ ho$ 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.
Source:	arXiv, nucl-ex/0506002
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