학술논문
Dielectron production in Au + Au collisions at sNN =200 GeV DIELECTRON PRODUCTION in Au + Au COLLISIONS ⋯ A. ADARE et al.
Document Type
Artikel
Author
Adare, A; Aidala, C.; Ajitanand, N N; Akiba, Y.; Akimoto, R.; Alexander, J J; Alfred, M.; Al-Ta'ani, H.; Angerami, A; Aoki, K.; Apadula, N.; Aramaki, Y; Asano, H.; Aschenauer, E. C.; Atomssa, E T; Averbeck, R; Awes, T. C.; Azmoun, B; Babintsev, V.; Bai, M.; Bandara, N. S.; Bannier, B.; Barish, K N; Bassalleck, B.; Bathe, S; Baublis, V.; Baumgart, S.; Bazilevsky, A.; Beaumier, M.; Beckman, S.; Belmont, R; Berdnikov, A; Berdnikov, Y.; Blau, D. S.; Bok, J S; Boyle, K; Brooks, M L; Bryslawskyj, J.; Buesching, H.; Bumazhnov, V.; Butsyk, S.; Campbell, S; Castera, P.; Chen, C. H.; Chi, C Y; Chiu, M.; Choi, I J; Choi, J. B.; Choi, S; Choudhury, R K; Christiansen, P.; Chujo, T.; Chvala, O; Cianciolo, V; Citron, Z; Cole, B A; Connors, M; Csanád, M; Csörgo, T.; Dairaku, S; Danley, T. W.; Datta, A.; Daugherity, M. S.; David, G; DeBlasio, K.; Dehmelt, K; Denisov, A.; Deshpande, A.; Desmond, E J; Dharmawardane, K. V.; Dietzsch, O; Ding, L.; Dion, A; Diss, P. B.; Do, J. H.; Donadelli, M; D'Orazio, L.; Drapier, O.; Drees, A; Drees, K A; Durham, J M; Durum, A.; Edwards, S.; Efremenko, Y V; Engelmore, T; Enokizono, A.; Esumi, S.; Eyser, K. O.; Fadem, B; Feege, N.; Fields, D E; Finger, M; Fleuret, F.; Fokin, S L; Frantz, J E; Franz, A; Frawley, A D; Fukao, Y.; Fusayasu, T; Gainey, K.; Gal, C.; Gallus, P; Garg, P.; Garishvili, A.; Garishvili, I.; Ge, H.; Giordano, F; Glenn, A.; Gong, X.; Gonin, M.; Goto, Y.; Granier de Cassagnac, R; Grau, N.; Greene, S V; Grosse Perdekamp, M.; Gunji, T; Guo, L.; Gustafsson, H.; Hachiya, T.; Haggerty, J S; Hahn, K I; Hamagaki, H; Hamilton, H. F.; Han, S. Y.; Hanks, J; Hasegawa, S; Haseler, T. O. S.; Hashimoto, K.; Haslum, E.; Hayano, R.; He, X.; Hemmick, T K; Hester, T; Hill, J C; Hollis, R. S.; Homma, K; Hong, B.; Horaguchi, T; Hori, Y.; Hoshino, T.; Hotvedt, N.; Huang, J; Huang, S.; Ichihara, T.; Iinuma, H.; Ikeda, Y; Imai, K.; Imrek, J.; Inaba, M.; Iordanova, A.; Isenhower, D.; Issah, M; Ivanishchev, D.; Jacak, B V; Javani, M.; Jezghani, M.; Jia, J; Jiang, X.; Johnson, B. M.; Joo, K S; Jouan, D.; Jumper, D S; Kamin, J; Kanda, S.; Kaneti, S; Kang, B. H.; Kang, J. H.; Kang, J. S.; Kapustinsky, J; Karatsu, K; Kasai, M.; Kawall, D; Kazantsev, A V; Kempel, T; Key, J. A.; Khachatryan, V; Khanzadeev, A.; Kijima, K M; Kim, B. I.; Kim, C.; Kim, D. J.; Kim, E. J.; Kim, G. W.; Kim, H. -J.; Kim, K. B.; Kim, M.; Kim, Y. J.; Kim, Y. K.; Kimelman, B.; Kinney, E; Kiss, C; Kistenev, E; Kitamura, R.; Klatsky, J.; Kleinjan, D.; Kline, P.; Koblesky, T.; Komatsu, Y.; Komkov, B; Koster, J; Kotchetkov, D; Kotov, D.; Král, A; Krizek, F.; Kunde, G J; Kurita, K; Kurosawa, M; Kwon, Y.; Kyle, G S; Lacey, R; Lai, Y S; Lajoie, J G; Lebedev, A.; Lee, B. B.; Lee, D. M; Lee, J.; Lee, K B; Lee, K S; Lee, S.; Lee, S. H.; Lee, S. R.; Leitch, M J; Leite, M A L; Leitgab, M.; Lewis, B.; Li, X.; Lim, S. H.; Linden Levy, L A; Liu, M. X.; Love, B; Lynch, D; Maguire, C F; Makdisi, Y I; Makek, M.; Manion, A.; Manko, V I; Mannel, E; Masumoto, S.; McCumber, M; McGaughey, P L; McGlinchey, D.; McKinney, C.; Meles, A.; Mendoza, M.; Meredith, B; Miake, Y; Mibe, T.; Mignerey, A C; Milov, A; Mishra, D. K.; Mitchell, J T; Miyachi, Y.; Miyasaka, S.; Mizuno, S.; Mohanty, A K; Mohapatra, S; Montuenga, P.; Moon, H. J.; Moon, T.; Morrison, D P; Motschwiller, S.; Moukhanova, T V; Murakami, T; Murata, J.; Mwai, A.; Nagae, T.; Nagamiya, S.; Nagashima, K.; Nagle, J L; Nagy, M I; Nakagawa, I; Nakagomi, H.; Nakamiya, Y; Nakamura, K. R.; Nakamura, T.; Nakano, K; Nattrass, C.; Nederlof, A.; Netrakanti, P. K.; Nihashi, M.; Niida, T; Nishimura, S; Nouicer, R; Novák, T.; Novitzky, N.; Nyanin, A S; O'Brien, E; Ogilvie, C A; Okada, K; Orjuela Koop, J. D.; Osborn, J. D.; Oskarsson, A.; Ouchida, M; Ozawa, K.; Pak, R; Pantuev, V; Papavassiliou, V.; Park, B. H.; Park, H I; Park, J. S.; Park, S.; Park, S. K.; Pate, S F; Patel, L.; Patel, M.; Pei, H; Peng, J. C.; Pereira, H; Perepelitsa, D V; Perera, G. D. N.; Peressounko, D Yu; Perry, J.; Petti, R; Pinkenburg, C; Pinson, R.; Pisani, R P; Proissl, M; Purschke, M L; Qu, H; Rak, J.; Ramson, B. J.; Ravinovich, I; Read, K. F.; Reynolds, D.; Riabov, V.; Riabov, Y.; Richardson, E; Rinn, T.; Roach, D; Roche, G.; Rolnick, S D; Rosati, M; Rowan, Z.; Rubin, J. G.; Sahlmueller, B.; Saito, N.; Sakaguchi, T; Sako, H.; Samsonov, V.; Sano, M.; Sarsour, M.; Sato, S; Sawada, S.; Schaefer, B.; Schmoll, B. K.; Sedgwick, K; Seidl, R; Sen, A; Seto, R; Sett, P.; Sexton, A.; Sharma, D; Shein, I.; Shibata, T. A.; Shigaki, K.; Shimomura, M; Shoji, K; Shukla, P.; Sickles, A; Silva, C L; Silvermyr, D.; Sim, K S; Singh, B. K.; Singh, C P; Singh, V.; Slunečka, M; Snowball, M.; Soltz, R A; Sondheim, W E; Sorensen, S P; Sourikova, I V; Stankus, P W; Stenlund, E.; Stepanov, M.; Ster, A; Stoll, S P; Sugitate, T; Sukhanov, A; Sumita, T.; Sun, J.; Sziklai, J; Takagui, E M; Takahara, A.; Taketani, A; Tanaka, Y; Taneja, S.; Tanida, K.; Tannenbaum, M J; Tarafdar, S; Taranenko, A; Tennant, E.; Themann, H; Tieulent, R; Timilsina, A.; Todoroki, T; Tomášek, L; Tomášek, M; Torii, H.; Towell, C. L.; Towell, R.; Towell, R S; Tserruya, I; Tsuchimoto, Y; Tsuji, T.; Vale, C; van Hecke, H W; Vargyas, M; Vazquez-Zambrano, E; Veicht, A; Velkovska, J.; Vértesi, R; Virius, M; Vossen, A.; Vrba, V; Vznuzdaev, E.; Wang, X. R.; Watanabe, D.; Watanabe, K.; Watanabe, Y; Watanabe, Y. S.; Wei, F; Wei, R; White, A. S.; White, S N; Winter, D; Wolin, S.; Woody, C L; Wysocki, M; Xia, B.; Xue, L.; Yalcin, S.; Yamaguchi, Y L; Yang, R.; Yanovich, A.; Ying, J; Yokkaichi, S; Yoo, J. H.; Yoon, I.; You, Z; Younus, I; Yu, H.; Yushmanov, I E; Zajc, W A; Zelenski, A.; Zhou, S; Zou, L.
Source
Physical Review C: covering nuclear physics. 93(1)
Subject
Language
English
ISSN
2469-9985
Abstract
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. The e+e- yield is compared 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 mc@nlo, 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. 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.