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Heavy-quark production and elliptic flow in Au plus Au collisions at root(NN)-N-S=62.4 GeV

Adare, A. ; Aidala, C. ; Ajitanand, N. N. ; Akiba, Y. ; Akimoto, R. ; Al-Ta'ani, H. ; Alexander, J. ; Angerami, A. ; Aoki, K. and Apadula, N. , et al. (2015) In Physical Review C (Nuclear Physics) 91(4).
Abstract
We present measurements of electrons and positrons from the semileptonic decays of heavy-flavor hadrons at midrapidity (vertical bar gamma vertical bar < 0.35) in Au + Au collisions at root(NN)-N-S = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 < p(T)(e) < 5 GeV/c. The invariant yield per binary collision is slightly enhanced above the p + p reference in Au + Au 0%-20%, 20%-40%, and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and... (More)
We present measurements of electrons and positrons from the semileptonic decays of heavy-flavor hadrons at midrapidity (vertical bar gamma vertical bar < 0.35) in Au + Au collisions at root(NN)-N-S = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 < p(T)(e) < 5 GeV/c. The invariant yield per binary collision is slightly enhanced above the p + p reference in Au + Au 0%-20%, 20%-40%, and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The v(2) of electrons from heavy-flavor decays is nonzero when averaged between 1.3 < p(T)(e) < 2.5 GeV/c for 0%-40% centrality collisions at root(NN)-N-S = 62.4 GeV. For 20%-40% centrality collisions, the v(2) at root(NN)-N-S = 62.4 GeV is smaller than that for heavy-flavor decays at root(NN)-N-S = 200 GeV. The v2 of the electrons from heavy-flavor decay at the lower beam energy is also smaller than v(2) for pions. Both results indicate that the heavy quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at root(NN)-N-S = 200 GeV. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C (Nuclear Physics)
volume
91
issue
4
article number
044907
publisher
American Physical Society
external identifiers
  • wos:000353545200001
  • scopus:84928974583
ISSN
0556-2813
DOI
10.1103/PhysRevC.91.044907
language
English
LU publication?
yes
id
8daf3847-5332-492a-9913-ea684aa978d5 (old id 5386162)
date added to LUP
2016-04-01 14:15:17
date last changed
2023-04-06 19:58:56
@article{8daf3847-5332-492a-9913-ea684aa978d5,
  abstract     = {{We present measurements of electrons and positrons from the semileptonic decays of heavy-flavor hadrons at midrapidity (vertical bar gamma vertical bar &lt; 0.35) in Au + Au collisions at root(NN)-N-S = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 &lt; p(T)(e) &lt; 5 GeV/c. The invariant yield per binary collision is slightly enhanced above the p + p reference in Au + Au 0%-20%, 20%-40%, and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The v(2) of electrons from heavy-flavor decays is nonzero when averaged between 1.3 &lt; p(T)(e) &lt; 2.5 GeV/c for 0%-40% centrality collisions at root(NN)-N-S = 62.4 GeV. For 20%-40% centrality collisions, the v(2) at root(NN)-N-S = 62.4 GeV is smaller than that for heavy-flavor decays at root(NN)-N-S = 200 GeV. The v2 of the electrons from heavy-flavor decay at the lower beam energy is also smaller than v(2) for pions. Both results indicate that the heavy quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at root(NN)-N-S = 200 GeV.}},
  author       = {{Adare, A. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Al-Ta'ani, H. and Alexander, J. and Angerami, A. and Aoki, K. and Apadula, N. and Aramaki, Y. and Asano, H. and Aschenauer, E. C. and Atomssa, E. T. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Bannier, B. and Barish, K. N. and Bassalleck, B. and Bathe, S. and Baublis, V. and Baumgart, S. and Bazilevsky, A. and Belmont, R. and Berdnikov, A. and Berdnikov, Y. and Bing, X. and Blau, D. S. and Bok, J. S. and Boyle, K. and Brooks, M. L. 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, Peter and Chujo, T. and Chvala, O. and Cianciolo, V. and Citron, Z. and Cole, B. A. and Connors, M. and Csanad, M. and Csoergo, T. and Dairaku, S. and Datta, A. and Daugherity, M. S. and David, G. and Denisov, A. and Deshpande, A. and Desmond, E. J. and Dharmawardane, K. V. and Dietzsch, O. and Ding, L. and Dion, A. and Donadelli, M. and Drapier, O. and Drees, A. and Drees, K. A. and Durham, J. M. and Durum, A. and D'Orazio, L. and Edwards, S. and Efremenko, Y. V. and Engelmore, T. and Enokizono, A. and Esumi, S. and Eyser, K. O. and Fadem, B. and Fields, D. E. and Finger, M. and Finger, M. Jr. 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 Garishvili, A. and Garishvili, I. and Glenn, A. and Gong, X. and Gonin, M. and Goto, Y. and de Cassagnac, R. Granier and Grau, N. and Greene, S. V. and Perdekamp, M. Grosse and Gunji, T. and Guo, L. and Gustafsson, Hans-Åke and Hachiya, T. and Haggerty, J. S. and Hahn, K. I. and Hamagaki, H. and Hanks, J. and Hashimoto, K. and Haslum, Eva 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 Huang, S. and Ichihara, T. and Iinuma, H. and Ikeda, Y. 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 Jia, J. and Jiang, X. and Johnson, B. M. and Joo, K. S. and Jouan, D. and Jumper, D. S. and Kamin, J. 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 Khanzadeev, A. and Kijima, K. M. and Kim, B. I. and Kim, C. and Kim, D. J. and Kim, E. -J. and Kim, H. J. and Kim, K. -B. and Kim, Y. -J. and Kim, Y. K. and Kinney, E. and Kiss, A. and Kistenev, E. and Klatsky, J. and Kleinjan, D. and Kline, P. and Komatsu, Y. and Komkov, B. and Koster, J. and Kotchetkov, D. and Kotov, D. and Kral, A. and Krizek, F. and Kunde, G. J. and Kurita, K. and Kurosawa, M. and Kwon, Y. and Lacey, R. and Kyle, G. S. and Lai, Y. S. and Lajoie, J. G. and Lebedev, A. and Lee, B. and Lee, D. M. and Lee, J. and Lee, K. B. and Lee, K. 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 Lim, S. H. and Levy, L. A. Linden and Liu, M. X. and Love, B. 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 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 Mohanty, A. K. and Moon, H. J. and Morrison, D. P. and Motschwiller, S. and Moukhanova, T. V. and Murakami, T. and Murata, J. and Nagae, T. and Nagamiya, S. and Nagle, J. L. and Nagy, M. I. and Nakagawa, I. and Nakamiya, Y. and Nakamura, K. R. and Nakamura, T. and Nakano, K. and Nattrass, C. and Nederlof, A. and Nihashi, M. and Nouicer, R. and Novitzky, N. and Nyanin, A. S. and O'Brien, E. and Ogilvie, C. A. and Okada, K. and Oskarsson, Anders and Ouchida, M. and Ozawa, K. and Pak, R. and Pantuev, V. and Papavassiliou, V. and Park, B. H. and Park, I. H. and Park, S. K. and Pate, S. F. and Patel, L. and Pei, H. and Peng, J. -C. and Pereira, H. and Peressounko, D. Yu. and Petti, R. and Pinkenburg, C. and Pisani, R. P. and Proissl, M. and Purschke, M. L. and Qu, H. and Rak, J. and Ravinovich, I. and Read, K. F. and Reynolds, D. and Riabov, V. and Riabov, Y. and Richardson, E. and Riveli, N. and Roach, D. and Roche, G. and Rolnick, S. D. and Rosati, M. and Sahlmueller, B. and Saito, N. and Sakaguchi, T. and Samsonov, V. and Sano, M. and Sarsour, M. and Sawada, S. and Sedgwick, K. and Seidl, R. and Sen, A. and Seto, R. 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 Slunecka, M. and Soltz, R. A. and Sondheim, W. E. and Sorensen, S. P. and Soumya, M. and Sourikova, I. V. and Stankus, P. W. and Stenlund, Evert and Stepanov, M. and Ster, A. and Stoll, S. P. and Sugitate, T. and Sukhanov, A. 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 Todoroki, T. and Tomasek, L. and Tomasek, M. and Torii, H. 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 Vertesi, 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 Whitaker, S. and White, S. N. and Winter, D. and Wolin, S. and Woody, C. L. and Wysocki, M. and Yamaguchi, Y. L. and Yang, R. and Yanovich, A. and Ying, J. and Yokkaichi, S. and You, Z. and Younus, I. and Yushmanov, I. E. and Zajc, W. A. and Zelenski, A.}},
  issn         = {{0556-2813}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C (Nuclear Physics)}},
  title        = {{Heavy-quark production and elliptic flow in Au plus Au collisions at root(NN)-N-S=62.4 GeV}},
  url          = {{http://dx.doi.org/10.1103/PhysRevC.91.044907}},
  doi          = {{10.1103/PhysRevC.91.044907}},
  volume       = {{91}},
  year         = {{2015}},
}