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Drees, A.Marin, A.Pfeiffer, B.Lenkeit, Ch.Fuchs, Ch.Jung, C.P.de los Heros, C.Voigt, C.Weber, D.Miskowiec, E.Gatti, E.Socol, F.Messer, G.Agakichiev, G.Hering, G.Tel-Zur, H.Appelshauser, H.J.Specht, H.Sako, I.Ravinovich, I.Tserruya, J.Bielcikova, J.P.Wessels, J.P.Wurm, J.Rak, J.Schukraft, J.Stachel, M.Messer, M.Richter, M.Sampietro, N.Saveljic, O.Nix, P.Braun-Munzinger, P.Glassel, P.Holl, P.Rehak, R.Baur, S.Damjanovic, S.Esumi, S.Razin, S.Shimanskiy, S.Voloshin, T.Ullrich, T.Wienold, U.Faschingbauer, V.Yurevich, W.Schmitz, W.Seipp, Yu.Panebrattsev, Z.Fraenkel","submitted_at":"2005-06-01T15:24:16Z","abstract_excerpt":"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. 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