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| 題名: | Dielectron production in Au + Au collisions at sNN =200 GeV |
| 作者: | 彭仁傑;Ajitanand, N. N.;Angerami, A.;Asano, H.;Bathe, S.;Beaumier, M.;Beckman, S.;Butsyk, S.;Campbell, S.;Castera, P.;Chen, C.-H.;Chi, C. Y.;Cianciolo, V.;Diss, P. B.;Fadem, B.;Finger, M.;Gal, C.;Garishvili, A.;Grau, N.;Grosse Perdekamp, M.;Gunji, T.;Gustafsson, H.-Å.;Hamilton, H. F.;Hasegawa, S.;Haslum, E.;Hayano, R.;Hester, T.;Iinuma, H.;Imrek, J.;Issah, M.;Jacak, B. V.;Jezghani, M.;Jumper, D. S.;Kanda, S.;Kazantsev, A. V.;Khachatryan, V.;Kijima, K. M.;Kistenev, E.;Klatsky, J.;Komatsu, Y.;Král, A.;Krizek, F.;Lee, S. H.;Leitch, M. J.;Leite, M. A. L.;Lim, S. H.;Lynch, D.;Manion, A.;McGaughey, P. L.;Mitchell, J. T.;Mizuno, S.;Mwai, A.;Nagy, M. I.;Nakagomi, H.;Nakamura, K. R.;Nattrass, C.;Nishimura, S.;Novitzky, N.;Nyanin, A. S.;Ozawa, K.;Pak, R.;Park, I. H.;Park, S.;Patel, M.;Peng, J.-C.;Petti, R.;Pinkenburg, C.;Pinson, R.;Pisani, R. P.;Proissl, M.;Purschke, M. L.;Qu, H.;Reynolds, D.;Riabov, V.;Rubin, J. G.;Sarsour, M.;Schmoll, B. K.;Sett, P.;Shimomura, M.;Silva, C. L.;Singh, V.;Snowball, M.;Soltz, R. A.;Stankus, P. W.;Takagui, E. M.;Tannenbaum, M. J.;Themann, H.;Timilsina, A.;Tomášek, M.;Tsuchimoto, Y.;Vale, C.;van Hecke, H. W.;Vértesi, R.;Vossen, A.;Vznuzdaev, E.;Watanabe, D.;Yang, R.;Ying, J.;Yokkaichi, S.;Yu, H.;Zou, L. |
| 貢獻者: | 高能與強場物理研究中心 |
| 日期: | 2016-01-11 |
| 上傳時間: | 2026-04-23 12:01:07 (UTC+8) |
| 出版者: | American Physical Society;United States: American Physical Society (APS) |
| 摘要: | 摘要： Here, we present measurements of e(+)e-production at midrapidity in Au + Au collisions at √sNN = 200 GeV. The invariant yield is studied within the PHENIX detector acceptance over a wide range of mass (mee < 5 GeV/c2) and pair transverse momentum (pT < 5 GeV/c) for minimum bias and for five centrality classes. We compare the e+e- yield to the expectations from known sources. In the low-mass region (mee = 0.30-0.76 GeV/c2) there is an enhancement that increases with centrality and is distributed over the entire pair pT range measured. It is significantly smaller than previously reported by the PHENIX experiment and amounts to 2.3 ± 0.4(stat) ± 0.4(syst) ± 0.2(model) or to 1.7 ± 0.3(stat) ± 0.3(syst) ± 0.2(model) for minimum bias collisions when the open heavy-flavor contribution is calculated with PYTHIA or MCNLO, respectively. The inclusive mass and pT distributions, as well as the centrality dependence, are well reproduced by model calculations where the enhancement mainly originates from the melting of the ρ meson resonance as the system approaches chiral symmetry restoration. Finally, in the intermediate-mass region (mee = 1.2-2.8 GeV/c2), the data hint at a significant contribution in addition to the yield from the semileptonic decays of heavy-flavor mesons.
出版者： United States: American Physical Society (APS)
出版日期： 2016-01-11
出處： Physical review. C, 2016-01, Vol.93 (1), Article 014904
識別號： ISSN: 2469-9985
識別號： EISSN: 2469-9993
識別號： DOI: 10.1103/PhysRevC.93.014904 |
| 顯示於類別: | [高能與強場物理研究中心] 期刊論文
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