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Dielectron production in Au plus Au collisions at root s(NN)=200 GeV

Adare, A; Aidala, C.; Ajitanand, N N; Akiba, Y.; Akimoto, R.; Alexander, J J; Alfred, M.; Al-Ta'ani, H.; Angerami, A and Aoki, K., et al. (2016) In Physical Review C (Nuclear Physics) 93(1).
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... (More)

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.

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Physical Review C (Nuclear Physics)
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93
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1
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American Physical Society
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  • wos:000367895300007
  • scopus:84954494794
  • scopus:85019287872
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0556-2813
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10.1103/PhysRevC.93.014904
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English
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2016-02-29 09:18:46
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@article{089f4b84-1872-438f-b499-006fa856a717,
  abstract     = {<p>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&lt;5 GeV/c2) and pair transverse momentum (pT&lt;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.</p>},
  articleno    = {014904},
  author       = {Adare, A and Aidala, C. and Ajitanand, N N and Akiba, Y. and Akimoto, R. and Alexander, J J and Alfred, M. and Al-Ta'ani, H. and Angerami, A and Aoki, K. and Apadula, N. and Aramaki, Y and Asano, H. and Aschenauer, E. C. and Atomssa, E T and Averbeck, R and Awes, T. C. and Azmoun, B and Babintsev, V. and Bai, M. and Bandara, N. S. and Bannier, B. and Barish, K N and Bassalleck, B. and Bathe, S and Baublis, V. and Baumgart, S. and Bazilevsky, A. and Beaumier, M. and Beckman, S. and Belmont, R and Berdnikov, A and Berdnikov, Y. and Blau, D. S. and Bok, J S and Boyle, K and Brooks, M L and Bryslawskyj, J. and Buesching, H. and Bumazhnov, V. and Butsyk, S. and Campbell, S and Castera, P. and Chen, C. H. and Chi, C Y and Chiu, M. and Choi, I J and Choi, J. B. and Choi, S and Choudhury, R K and Christiansen, P. and Chujo, T. and Chvala, O and Cianciolo, V and Citron, Z and Cole, B A and Connors, M and Csanád, M and Csörgo, T. and Dairaku, S and Danley, T. W. and Datta, A. and Daugherity, M. S. and David, G and DeBlasio, K. and Dehmelt, K and Denisov, A. and Deshpande, A. and Desmond, E J and Dharmawardane, K. V. and Dietzsch, O and Ding, L. and Dion, A and Diss, P. B. and Do, J. H. and Donadelli, M and D'Orazio, L. and Drapier, O. and Drees, A and Drees, K A and Durham, J M and Durum, A. and Edwards, S. and Efremenko, Y V and Engelmore, T and Enokizono, A. and Esumi, S. and Eyser, K. O. and Fadem, B and Feege, N. and Fields, D E and Finger, M and Finger, M and Fleuret, F. and Fokin, S L and Frantz, J E and Franz, A and Frawley, A D and Fukao, Y. and Fusayasu, T and Gainey, K. and Gal, C. and Gallus, P and Garg, P. and Garishvili, A. and Garishvili, I. and Ge, H. and Giordano, F and Glenn, A. and Gong, X. and Gonin, M. and Goto, Y. and Granier de Cassagnac, R and Grau, N. and Greene, S V and Grosse Perdekamp, M. and Gunji, T and Guo, L. and Gustafsson, H. and Hachiya, T. and Haggerty, J S and Hahn, K I and Hamagaki, H and Hamilton, H. F. and Han, S. Y. and Hanks, J and Hasegawa, S and Haseler, T. O. S. and Hashimoto, K. and Haslum, E. and Hayano, R. and He, X. and Hemmick, T K and Hester, T and Hill, J C and Hollis, R. S. and Homma, K and Hong, B. and Horaguchi, T and Hori, Y. and Hoshino, T. and Hotvedt, N. and Huang, J and Huang, S. and Ichihara, T. and Iinuma, H. and Ikeda, Y and Imai, K. and Imrek, J. and Inaba, M. and Iordanova, A. and Isenhower, D. and Issah, M and Ivanishchev, D. and Jacak, B V and Javani, M. and Jezghani, M. and Jia, J and Jiang, X. and Johnson, B. M. and Joo, K S and Jouan, D. and Jumper, D S and Kamin, J and Kanda, S. and Kaneti, S and Kang, B. H. and Kang, J. H. and Kang, J. S. and Kapustinsky, J and Karatsu, K and Kasai, M. and Kawall, D and Kazantsev, A V and Kempel, T and Key, J. A. and Khachatryan, V and Khanzadeev, A. and Kijima, K M and Kim, B. I. and Kim, C. and Kim, D. J. and Kim, E. J. and Kim, G. W. and Kim, H. -J. and Kim, K. B. and Kim, M. and Kim, Y. J. and Kim, Y. K. and Kimelman, B. and Kinney, E and Kiss, C and Kistenev, E and Kitamura, R. and Klatsky, J. and Kleinjan, D. and Kline, P. and Koblesky, T. and Komatsu, Y. and Komkov, B and Koster, J and Kotchetkov, D and Kotov, D. and Král, A and Krizek, F. and Kunde, G J and Kurita, K and Kurosawa, M and Kwon, Y. and Kyle, G S and Lacey, R and Lai, Y S and Lajoie, J G and Lebedev, A. and Lee, B. B. and Lee, D. M, and Lee, J. and Lee, K B and Lee, K S and Lee, S. and Lee, S. H. and Lee, S. R. and Leitch, M J and Leite, M A L and Leitgab, M. and Lewis, B. and Li, X. and Lim, S. H. and Linden Levy, L A and Liu, M. X. and Love, B and Lynch, D and Maguire, C F and Makdisi, Y I and Makek, M. and Manion, A. and Manko, V I and Mannel, E and Masumoto, S. and McCumber, M and McGaughey, P L and McGlinchey, D. and McKinney, C. and Meles, A. and Mendoza, M. and Meredith, B and Miake, Y and Mibe, T. and Mignerey, A C and Milov, A and Mishra, D. K. and Mitchell, J T and Miyachi, Y. and Miyasaka, S. and Mizuno, S. and Mohanty, A K and Mohapatra, S and Montuenga, P. and Moon, H. J. and Moon, T. and Morrison, D P and Motschwiller, S. and Moukhanova, T V and Murakami, T and Murata, J. and Mwai, A. and Nagae, T. and Nagamiya, S. and Nagashima, K. and Nagle, J L and Nagy, M I and Nakagawa, I and Nakagomi, H. and Nakamiya, Y and Nakamura, K. R. and Nakamura, T. and Nakano, K and Nattrass, C. and Nederlof, A. and Netrakanti, P. K. and Nihashi, M. and Niida, T and Nishimura, S and Nouicer, R and Novák, T. and Novitzky, N. and Nyanin, A S and O'Brien, E and Ogilvie, C A and Okada, K and Orjuela Koop, J. D. and Osborn, J. D. and Oskarsson, A. and Ouchida, M and Ozawa, K. and Pak, R and Pantuev, V and Papavassiliou, V. and Park, B. H. and Park, H I and Park, J. S. and Park, S. and Park, S. K. and Pate, S F and Patel, L. and Patel, M. and Pei, H and Peng, J. C. and Pereira, H and Perepelitsa, D V and Perera, G. D. N. and Peressounko, D Yu and Perry, J. and Petti, R and Pinkenburg, C and Pinson, R. and Pisani, R P and Proissl, M and Purschke, M L and Qu, H and Rak, J. and Ramson, B. J. and Ravinovich, I and Read, K. F. and Reynolds, D. and Riabov, V. and Riabov, Y. and Richardson, E and Rinn, T. and Roach, D and Roche, G. and Rolnick, S D and Rosati, M and Rowan, Z. and Rubin, J. G. and Sahlmueller, B. and Saito, N. and Sakaguchi, T and Sako, H. and Samsonov, V. and Sano, M. and Sarsour, M. and Sato, S and Sawada, S. and Schaefer, B. and Schmoll, B. K. and Sedgwick, K and Seidl, R and Sen, A and Seto, R and Sett, P. and Sexton, A. and Sharma, D and Shein, I. and Shibata, T. A. and Shigaki, K. and Shimomura, M and Shoji, K and Shukla, P. and Sickles, A and Silva, C L and Silvermyr, D. and Sim, K S and Singh, B. K. and Singh, C P and Singh, V. and Slunečka, M and Snowball, M. and Soltz, R A and Sondheim, W E and Sorensen, S P and Sourikova, I V and Stankus, P W and Stenlund, E. and Stepanov, M. and Ster, A and Stoll, S P and Sugitate, T and Sukhanov, A and Sumita, T. and Sun, J. and Sziklai, J and Takagui, E M and Takahara, A. and Taketani, A and Tanaka, Y and Taneja, S. and Tanida, K. and Tannenbaum, M J and Tarafdar, S and Taranenko, A, and Tennant, E. and Themann, H and Tieulent, R and Timilsina, A. and Todoroki, T and Tomášek, L and Tomášek, M and Torii, H. and Towell, C. L. and Towell, R. and Towell, R S and Tserruya, I and Tsuchimoto, Y and Tsuji, T. and Vale, C and van Hecke, H W and Vargyas, M and Vazquez-Zambrano, E and Veicht, A and Velkovska, J. and Vértesi, R and Virius, M and Vossen, A. and Vrba, V and Vznuzdaev, E. and Wang, X. R. and Watanabe, D. and Watanabe, K. and Watanabe, Y and Watanabe, Y. S. and Wei, F and Wei, R and White, A. S. and White, S N and Winter, D- and Wolin, S. and Woody, C L and Wysocki, M and Xia, B. and Xue, L. and Yalcin, S. and Yamaguchi, Y L and Yang, R. and Yanovich, A. and Ying, J and Yokkaichi, S and Yoo, J. H. and Yoon, I. and You, Z and Younus, I and Yu, H. and Yushmanov, I E and Zajc, W A and Zelenski, A. and Zhou, S and Zou, L. and , },
  issn         = {0556-2813},
  language     = {eng},
  month        = {01},
  number       = {1},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Dielectron production in Au plus Au collisions at root s(NN)=200 GeV},
  url          = {http://dx.doi.org/10.1103/PhysRevC.93.014904},
  volume       = {93},
  year         = {2016},
}