{"paper":{"title":"e+e--pair production in Pb-Au collisions at 158 GeV per nucleon","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A.Cherlin, A. 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. The measured yield, its stronger-than-linear scaling with $N_{ch}$, and the dominance of low pair $p_t$ strongly suggest an interpreta"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-ex/0506002","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}