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Centrality dependence of low-momentum direct-photon production in Au plus Au collisions at root s(NN)=200 GeV

Adare, A. ; Afanasiev, S. ; Aidala, C. ; Ajitanand, N. N. ; Akiba, Y. ; Akimoto, R. ; Al-Bataineh, H. ; Al-Ta'ani, H. ; Alexander, J. and Angerami, A. , et al. (2015) In Physical Review C (Nuclear Physics) 91(6).
Abstract
The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au + Au collisions at root s(NN) = 200 GeV down to pT = 0.4 GeV/c. Photons are detected via photon conversions to e(+)e(-) pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low pT. We find an excess of direct photons above the N-coll-scaled yield measured in p + p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/c in the pT range 0.6-2.0 GeV/c. While the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases... (More)
The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au + Au collisions at root s(NN) = 200 GeV down to pT = 0.4 GeV/c. Photons are detected via photon conversions to e(+)e(-) pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low pT. We find an excess of direct photons above the N-coll-scaled yield measured in p + p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/c in the pT range 0.6-2.0 GeV/c. While the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with N-part(alpha), where alpha = 1.38 +/- 0.03(stat) +/- 0.07(syst). (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
6
article number
064904
publisher
American Physical Society
external identifiers
  • wos:000355648500003
  • scopus:84935901818
ISSN
0556-2813
DOI
10.1103/PhysRevC.91.064904
language
English
LU publication?
yes
id
2fba692b-a0c6-495a-a00c-b94502fa47ff (old id 7609201)
date added to LUP
2016-04-01 13:53:56
date last changed
2023-01-04 01:23:52
@article{2fba692b-a0c6-495a-a00c-b94502fa47ff,
  abstract     = {{The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au + Au collisions at root s(NN) = 200 GeV down to pT = 0.4 GeV/c. Photons are detected via photon conversions to e(+)e(-) pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low pT. We find an excess of direct photons above the N-coll-scaled yield measured in p + p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/c in the pT range 0.6-2.0 GeV/c. While the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with N-part(alpha), where alpha = 1.38 +/- 0.03(stat) +/- 0.07(syst).}},
  author       = {{Adare, A. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Al-Bataineh, H. 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 Averbeck, R. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Baksay, G. and Baksay, L. and Bannier, B. and Barish, K. N. and Bassalleck, B. and Basye, A. T. and Bathe, S. and Baublis, V. and Baumann, C. and Baumgart, S. and Bazilevsky, A. and Belikov, S. and Belmont, R. and Bennett, R. and Berdnikov, A. and Berdnikov, Y. and Bickley, A. A. 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 Bunce, G. and Butsyk, S. and Camacho, C. M. 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 Chung, P. and Chvala, O. and Cianciolo, V. and Citron, Z. and Cole, B. A. and Connors, M. and Constantin, P. and Csanad, M. and Csoergo, T. and Dahms, T. and Dairaku, S. and Danchev, I. and Das, K. 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 Dutta, D. and D'Orazio, L. and Edwards, S. and Efremenko, Y. V. and Ellinghaus, F. and Engelmore, T. and Enokizono, A. and En'yo, H. and Esumi, S. and Eyser, K. O. and Fadem, B. and Fields, D. E. and Finger, M. and Finger Jr., M. and Fleuret, F. and Fokin, S. L. and Fraenkel, Z. and Frantz, J. E. and Franz, A. and Frawley, A. D. and Fujiwara, K. and Fukao, Y. and Fusayasu, T. and Gainey, K. and Gal, C. and Garishvili, A. and Garishvili, I. and Glenn, A. and Gong, H. and Gong, X. and Gonin, M. and Goto, Y. and de Cassagnac, R. Granier and Grau, N. and Greene, 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 Hamblen, J. and Han, R. and Hanks, J. and Hartouni, E. P. and Hashimoto, K. and Haslum, Eva and Hayano, R. and He, X. and Heffner, M. and Hemmick, T. K. and Hester, T. and Hill, J. C. and Hohlmann, M. and Hollis, R. S. and Holzmann, W. and Homma, K. and Hong, B. and Horaguchi, T. and Hori, Y. and Hornback, D. and Huang, S. and Ichihara, T. and Ichimiya, R. and Ide, J. and Iinuma, H. and Ikeda, Y. and Imai, K. and Imrek, J. and Inaba, M. and Iordanova, A. and Isenhower, D. and Ishihara, M. and Isobe, T. and Issah, M. and Isupov, A. and Ivanischev, D. and Ivanishchev, D. and Jacak, B. V. and Javani, M. and Jia, J. and Jiang, X. and Jin, J. and Johnson, B. M. and Joo, K. S. and Jouan, D. and Jumper, D. S. and Kajihara, F. and Kametani, S. and Kamihara, N. 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 Kawashima, M. and Kazantsev, A. V. and Kempel, T. and Khanzadeev, A. and Kijima, K. M. and Kim, B. I. and Kim, C. and Kim, D. H. and Kim, D. J. and Kim, E. and Kim, E. -J. and Kim, H. J. and Kim, K. -B. and Kim, S. H. and Kim, Y. -J. and Kim, Y. K. and Kinney, E. and Kiriluk, K. and Kiss, A. and Kistenev, E. and Klatsky, J. and Kleinjan, D. and Kline, P. and Kochenda, L. and Komatsu, Y. and Komkov, B. and Konno, M. and Koster, J. and Kotchetkov, D. and Kotov, D. and Kozlov, A. and Kral, A. and Kravitz, 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. and Lee, D. M. and Lee, J. and Lee, K. 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 Leitner, E. and Lenzi, B. and Lewis, B. and Li, X. and Liebing, P. and Lim, S. H. and Levy, L. A. Linden and Liska, T. and Litvinenko, A. and Liu, H. and Liu, M. X. and Love, B. and Luechtenborg, R. and Lynch, D. and Maguire, C. F. and Makdisi, Y. I. and Makek, M. and Malakhov, A. and Malik, M. D. and Manion, A. and Manko, V. I. and Mannel, E. and Mao, Y. and Masui, H. and Masumoto, S. and Matathias, F. and McCumber, M. and McGaughey, P. L. and McGlinchey, D. and McKinney, C. and Means, N. and Mendoza, M. and Meredith, B. and Miake, Y. and Mibe, T. and Mignerey, A. C. and Mikes, P. and Miki, K. and Milov, A. and Mishra, D. K. and Mishra, M. and Mitchell, J. T. and Miyachi, Y. and Miyasaka, S. and Mohanty, A. K. and Moon, H. J. and Morino, Y. and Morreale, A. and Morrison, D. 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F. and Reygers, K. 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 Rosen, C. A. and Rosendahl, Sarah and Rosnet, P. and Rukoyatkin, P. and Ruzicka, P. and Sahlmueller, B. and Saito, N. and Sakaguchi, T. and Sakashita, K. and Samsonov, V. and Sano, M. and Sano, S. and Sarsour, M. and Sato, T. and Sawada, S. and Sedgwick, K. and Seele, J. and Seidl, R. and Semenov, A. Yu. 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 Silvestre, C. 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 Sparks, N. A. 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 Tanabe, R. and Tanaka, Y. and Taneja, S. and Tanida, K. and Tannenbaum, M. J. and Tarafdar, S. and Taranenko, A. and Tarjan, P. and Tennant, E. and Themann, H. and Thomas, T. L. and Todoroki, T. and Togawa, M. and Toia, A. 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 Valle, H. and van Hecke, H. W. and Vargyas, M. and Vazquez-Zambrano, E. and Veicht, A. and Velkovska, J. and Vertesi, R. and Vinogradov, A. A. 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 Wessels, J. and Whitaker, S. and White, S. N. and Winter, D. and Wolin, S. and Wood, J. P. and Woody, C. L. and Wright, R. M. and Wysocki, M. and Xie, W. and Yamaguchi, Y. L. and Yamaura, K. and Yang, R. and Yanovich, A. and Ying, J. and Yokkaichi, S. and You, Z. and Young, G. R. and Younus, I. and Yushmanov, I. E. and Zajc, W. A. and Zelenski, A. and Zhang, C. and Zhou, S. and Zolin, L.}},
  issn         = {{0556-2813}},
  language     = {{eng}},
  number       = {{6}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C (Nuclear Physics)}},
  title        = {{Centrality dependence of low-momentum direct-photon production in Au plus Au collisions at root s(NN)=200 GeV}},
  url          = {{http://dx.doi.org/10.1103/PhysRevC.91.064904}},
  doi          = {{10.1103/PhysRevC.91.064904}},
  volume       = {{91}},
  year         = {{2015}},
}