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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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Physical Review C (Nuclear Physics)
volume
91
issue
4
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American Physical Society
external identifiers
  • wos:000353545200001
  • scopus:84928974583
ISSN
0556-2813
DOI
10.1103/PhysRevC.91.044907
language
English
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yes
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8daf3847-5332-492a-9913-ea684aa978d5 (old id 5386162)
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2015-05-18 15:17:20
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@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.},
  articleno    = {044907},
  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. 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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. 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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},
  volume       = {91},
  year         = {2015},
}