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Photon-hadron jet correlations in p plus p and Au plus Au collisions at s(NN)=200 GeV

Adare, A.; Afanasiev, S.; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Al-Bataineh, H.; Alexander, J.; Al-Jamel, A.; Aoki, K. and Aphecetche, L., et al. (2009) In Physical Review C (Nuclear Physics) 80(2).
Abstract
We report the observation at the Relativistic Heavy Ion Collider of suppression of back-to-back correlations in the direct photon+jet channel in Au+Au relative to p+p collisions. Two-particle correlations of direct photon triggers with associated hadrons are obtained by statistical subtraction of the decay photon-hadron (gamma-h) background. The initial momentum of the away-side parton is tightly constrained, because the parton-photon pair exactly balance in momentum at leading order in perturbative quantum chromodynamics, making such correlations a powerful probe of the in-medium parton energy loss. The away-side nuclear suppression factor, I-AA, in central Au+Au collisions, is 0.32 +/- 0.12(stat)+/- 0.09(syst) for hadrons of 3 <... (More)
We report the observation at the Relativistic Heavy Ion Collider of suppression of back-to-back correlations in the direct photon+jet channel in Au+Au relative to p+p collisions. Two-particle correlations of direct photon triggers with associated hadrons are obtained by statistical subtraction of the decay photon-hadron (gamma-h) background. The initial momentum of the away-side parton is tightly constrained, because the parton-photon pair exactly balance in momentum at leading order in perturbative quantum chromodynamics, making such correlations a powerful probe of the in-medium parton energy loss. The away-side nuclear suppression factor, I-AA, in central Au+Au collisions, is 0.32 +/- 0.12(stat)+/- 0.09(syst) for hadrons of 3 < p(T)(h)< 5 in coincidence with photons of 5 < p(T)(gamma)< 15 GeV/c. The suppression is comparable to that observed for high-p(T) single hadrons and dihadrons. The direct photon associated yields in p+p collisions scale approximately with the momentum balance, z(T)equivalent to p(T)(h)/p(T)(gamma), as expected for a measurement of the away-side parton fragmentation function. We compare to Au+Au collisions for which the momentum balance dependence of the nuclear modification should be sensitive to the path-length dependence of parton energy loss. (Less)
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Physical Review C (Nuclear Physics)
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80
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2
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American Physical Society
external identifiers
  • wos:000269640400054
  • scopus:70349124227
ISSN
0556-2813
DOI
10.1103/PhysRevC.80.024908
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English
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@article{b7808067-a4d7-4f1b-a1ea-77df83cf47b4,
  abstract     = {We report the observation at the Relativistic Heavy Ion Collider of suppression of back-to-back correlations in the direct photon+jet channel in Au+Au relative to p+p collisions. Two-particle correlations of direct photon triggers with associated hadrons are obtained by statistical subtraction of the decay photon-hadron (gamma-h) background. The initial momentum of the away-side parton is tightly constrained, because the parton-photon pair exactly balance in momentum at leading order in perturbative quantum chromodynamics, making such correlations a powerful probe of the in-medium parton energy loss. The away-side nuclear suppression factor, I-AA, in central Au+Au collisions, is 0.32 +/- 0.12(stat)+/- 0.09(syst) for hadrons of 3 &lt; p(T)(h)&lt; 5 in coincidence with photons of 5 &lt; p(T)(gamma)&lt; 15 GeV/c. The suppression is comparable to that observed for high-p(T) single hadrons and dihadrons. The direct photon associated yields in p+p collisions scale approximately with the momentum balance, z(T)equivalent to p(T)(h)/p(T)(gamma), as expected for a measurement of the away-side parton fragmentation function. We compare to Au+Au collisions for which the momentum balance dependence of the nuclear modification should be sensitive to the path-length dependence of parton energy loss.},
  author       = {Adare, A. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Al-Bataineh, H. and Alexander, J. and Al-Jamel, A. and Aoki, K. and Aphecetche, L. and Armendariz, R. and Aronson, S. H. and Asai, J. 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 Baldisseri, A. and Barish, K. N. and Barnes, P. D. and Bassalleck, B. and Basye, A. T. and Bathe, S. and Batsouli, S. and Baublis, V. and Bauer, F. and Baumann, C. and Bazilevsky, A. and Belikov, S. and Bennett, R. and Berdnikov, A. and Berdnikov, Y. and Bickley, A. A. and Bjorndal, M. T. and Boissevain, J. G. and Borel, H. and Boyle, K. and Brooks, M. L. and Brown, D. S. and Bucher, D. and Buesching, H. and Bumazhnov, V. and Bunce, G. and Burward-Hoy, J. M. and Butsyk, S. and Camacho, C. M. and Campbell, S. and Chai, J. -S. and Chang, B. S. and Chang, W. C. and Charvet, J. -L. and Chen, C. -H. and Chernichenko, S. and Chiba, J. and Chi, C. Y. and Chiu, M. and Choi, I. J. and Choudhury, R. K. and Chujo, T. and Chung, P. and Churyn, A. and Cianciolo, V. and Citron, Z. and Cleven, C. R. and Cobigo, Y. and Cole, B. A. and Comets, M. P. and Connors, M. and Constantin, P. and Csanad, M. and Csorgo, T. and Dahms, T. and Dairaku, S. and Das, K. and David, G. and Deaton, M. B. and Dehmelt, K. and Delagrange, H. and Denisov, A. and d'Enterria, D. and Deshpande, A. and Desmond, E. J. and Dietzsch, O. and Dion, A. and Donadelli, M. and Drachenberg, J. L. and Drapier, O. and Drees, A. and Drees, K. A. and Dubey, A. K. and Durum, A. and Dutta, D. and Dzhordzhadze, V. and Efremenko, Y. V. and Egdemir, J. and Ellinghaus, F. and Emam, W. S. and Engelmore, T. and Enokizono, A. and En'yo, H. and Espagnon, B. and Esumi, S. and Eyser, K. O. and Fadem, B. and Fields, D. E. and Finger, M., Jr. and Finger, M. and Fleuret, F. and Fokin, S. L. and Forestier, B. and Fraenkel, Z. and Frantz, J. E. and Franz, A. and Frawley, A. D. and Fujiwara, K. and Fukao, Y. and Fung, S. -Y. and Fusayasu, T. and Gadrat, S. and Garishvili, I. and Gastineau, F. and Germain, M. and Glenn, A. and Gong, H. and Gonin, M. and Gosset, J. and Goto, Y. and de Cassagnac, R. Granier and Grau, N. and Greene, S. V. and Perdekamp, M. Grosse and Gunji, T. and Gustafsson, Hans-Åke and Hachiya, T. and Henni, A. Hadj and Haegemann, C. and Haggerty, J. S. and Hagiwara, M. N. and Hamagaki, H. and Han, R. and Harada, H. and Hartouni, E. P. and Haruna, K. and Harvey, M. and Haslum, Eva and Hasuko, K. and Hayano, R. and Heffner, M. and Hemmick, T. K. and Hester, T. and Heuser, J. M. and He, X. and Hiejima, H. and Hill, J. C. and Hobbs, R. and Hohlmann, M. and Holmes, M. and Holzmann, W. and Homma, K. and Hong, B. and Horaguchi, T. and Hornback, D. and Huang, S. and Hur, M. G. and Ichihara, T. and Ichimiya, R. and Ikeda, Y. and Imai, K. and Imrek, J. and Inaba, M. and Inoue, Y. and Isenhower, D. and Isenhower, L. and Ishihara, M. and Isobe, T. and Issah, M. and Isupov, A. and Ivanischev, D. and Jacak, B. V. and Jia, J. and Jin, J. and Jinnouchi, O. and Johnson, B. M. and Joo, K. S. and Jouan, D. and Kajihara, F. and Kametani, S. and Kamihara, N. and Kamin, J. and Kaneta, M. and Kang, J. H. and Kanou, H. and Kapustinsky, J. and Kawagishi, T. and Kawall, D. and Kazantsev, A. V. and Kelly, S. and Kempel, T. and Khanzadeev, A. and Kijima, K. M. and Kikuchi, J. and Kim, B. I. and Kim, D. H. and Kim, D. J. and Kim, E. and Kim, S. H. and Kim, Y. -S. and Kinney, E. and Kiriluk, K. and Kiss, A. and Kistenev, E. and Kiyomichi, A. and Klay, J. and Klein-Boesing, C. and Kochenda, L. and Kochetkov, V. and Komkov, B. and Konno, M. and Koster, J. and Kotchetkov, D. and Kozlov, A. and Kral, A. and Kravitz, A. and Kroon, P. J. and Kubart, J. and Kunde, G. J. and Kurihara, N. and Kurita, K. and Kurosawa, M. and Kweon, M. J. and Kwon, Y. and Kyle, G. S. and Lacey, R. and Lai, Y. -S. and Lai, Y. S. and Lajoie, J. G. and Layton, D. and Lebedev, A. and Le Bornec, Y. and Leckey, S. and Lee, D. M. and Lee, K. B. and Lee, M. K. and Lee, T. and Leitch, M. J. and Leite, M. A. L. and Lenzi, B. and Liebing, P. and Lim, H. and Liska, T. and Litvinenko, A. and Liu, H. and Liu, M. X. and Li, X. and Li, X. H. and Love, B. and Lynch, D. and Maguire, C. F. and Makdisi, Y. I. and Malakhov, A. and Malik, M. D. and Manko, V. I. and Mannel, E. and Mao, Y. and Masek, L. and Masui, H. and Matathias, F. and McCain, M. C. and McCumber, M. and McGaughey, P. L. and Means, N. and Meredith, B. and Miake, Y. and Mikes, P. and Miki, K. and Miller, T. E. and Milov, A. and Mioduszewski, S. and Mishra, G. C. and Mishra, M. and Mitchell, J. T. and Mitrovski, M. and Mohanty, A. K. and Morino, Y. and Morreale, A. and Morrison, D. P. and Moss, J. M. and Moukhanova, T. V. and Mukhopadhyay, D. and Murata, J. and Nagamiya, S. and Nagata, Y. and Nagle, J. L. and Naglis, M. and Nagy, M. I. and Nakagawa, I. and Nakamiya, Y. and Nakamura, T. and Nakano, K. and Newby, J. and Nguyen, M. and Niita, T. and Norman, B. E. and Nouicer, R. and Nyanin, A. S. and Nystrand, Joakim and O'Brien, E. and Oda, S. X. and Ogilvie, C. A. and Ohnishi, H. and Ojha, I. D. and Okada, H. and Okada, K. and Oka, M. and Omiwade, O. O. and Onuki, Y. and Oskarsson, Anders and Otterlund, Ingvar and Ouchida, M. and Ozawa, K. and Pak, R. and Pal, D. and Palounek, A. P. T. and Pantuev, V. and Papavassiliou, V. and Park, J. and Park, W. J. and Pate, S. F. and Pei, H. and Peng, J. -C. and Pereira, H. and Peresedov, V. and Peressounko, D. Yu. and Pinkenburg, C. and Pisani, R. P. and Purschke, M. L. and Purwar, A. K. and Qu, H. and Rak, J. and Rakotozafindrabe, A. and Ravinovich, I. and Read, K. F. and Rembeczki, S. and Reuter, M. and Reygers, K. and Riabov, V. and Riabov, Y. and Roach, D. and Roche, G. and Rolnick, S. D. and Romana, A. and Rosati, M. and Rosendahl, Sarah and Rosnet, P. and Rukoyatkin, P. and Ruzicka, P. and Rykov, V. L. and Ryu, S. S. and Sahlmueller, B. and Saito, N. and Sakaguchi, T. and Sakai, S. and Sakashita, K. and Sakata, H. and Samsonov, V. and Sato, H. D. and Sato, S. and Sato, T. and Sawada, S. and Sedgwick, K. and Seele, J. and Seidl, R. and Semenov, A. Yu. and Semenov, V. and Seto, R. and Sharma, D. and Shea, T. K. and Shein, I. and Shevel, A. and Shibata, T. -A. and Shigaki, K. and Shimomura, M. and Shohjoh, T. 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 Skutnik, S. and Slunecka, M. and Smith, W. C. and Soldatov, A. and Soltz, R. A. and Sondheim, W. E. and Sorensen, S. P. and Sourikova, I. V. and Staley, F. and Stankus, P. 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L. and Yamaura, K. and Yang, R. and Yanovich, A. and Yasin, Z. and Ying, J. and Yokkaichi, S. and Young, G. R. and Younus, I. and Yushmanov, I. E. and Zajc, W. A. and Zaudtke, O. and Zhang, C. and Zhou, S. and Zimanyi, J. and Zolin, L.},
  issn         = {0556-2813},
  language     = {eng},
  number       = {2},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Photon-hadron jet correlations in p plus p and Au plus Au collisions at s(NN)=200 GeV},
  url          = {http://dx.doi.org/10.1103/PhysRevC.80.024908},
  volume       = {80},
  year         = {2009},
}