Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations

Abelev, B.; Aggarwal, M.; Ahammed, Z.; Alakhverdyants, A.; Anderson, B.; Arkhipkin, D.; Averichev, G.; Balewski, J.; Barannikova, O.; Barnby, L.; Baudot, J.; Baumgart, S.; Beavis, D.; Bellwied, R.; Benedosso, F.; Betancourt, M.; Betts, R.; Bhasin, A.; Bhati, A.; Bichsel, H.; Bielcik, J.; Bielcikova, J.; Biritz, B.; Bland, L.; Bnzarov, I.; Bombara, M.; Bonner, B.; Bouchet, J.; Braidot, E.; Brandin, A.; Bruna, E.; Bueltmann, S.; Burton, T.; Bystersky, M.; Cai, X.; Caines, H.; Calderón de la Barca Sánchez, M.; Catu, O.; Cebra, D.; Cendejas, R.; Cervantes, M.; Chajecki, Z.; Chaloupka, P.; Chattopadhyay, S.; Chen, H.; Chen, J.; Chen, J.; Cheng, J.; Cherney, M.; Chikanian, A.; Choi, K.; Christie, W.; Clarke, R.; Codrington, M.; Corliss, R.; Cormier, T.; Cosentino, M.; Cramer, J.; Crawford, H.; Das, D.; Dash, S.; Daugherity, M.; De Silva, L.; Dedovich, T.; DePhillips, M.; Derevschikov, A.; Derradi de Souza, R.; Didenko, L.; Djawotho, P.; Dogra, S.; Dong, X.; Drachenberg, J.; Draper, J.; Dunlop, J.; Dutta Mazumdar, M.; Efimov, L.; Elhalhuli, E.; Elnimr, M.; Engelage, J.; Eppley, G.; Erazmus, B.; Estienne, M.; Eun, L.; Fachini, P.; Fatemi, R.; Fedorisin, J.; Feng, A.; Filip, P.; Finch, E.; Fine, V.; Fisyak, Y.; Gagliardi, C.; Gaillard, L.; Gangadharan, D.; Ganti, M.; Garcia-Solis, E.; Geromitsos, A.; Geurts, F.; Ghazikhanian, V.; Ghosh, P.; Gorbunov, Y.; Gordon, A.; Grebenyuk, O.; Grosnick, D.; Grube, B.; Guertin, S.; Guimaraes, K.; Gupta, A.; Gupta, N.; Guryn, W.; Haag, B.; Hallman, T.; Hamed, A.; Harris, J.; He, W.; Heinz, M.; Heppelmann, S.; Hippolyte, B.; Hirsch, A.; Hjort, E.; Hoffman, A.; Hoffmann, G.; Hofman, D.; Hollis, R.; Huang, H.; Humanic, T.; Huo, L.; Igo, G.; Iordanova, A.; Jacobs, P.; Jacobs, W.; Jakl, P.; Jena, C.; Jin, F.; Jones, C.; Jones, P.; Joseph, J.; Judd, E.; Kabana, S.; Kajimoto, K.; Kang, K.; Kapitan, J.; Kauder, K.; Keane, D.; Kechechyan, A.; Kettler, D.; Khodyrev, V.; Kikola, D.; Kiryluk, J.; Kisiel, A.; Klein, S.; Knospe, A.; Kocoloski, A.; Koetke, D.; Konzer, J.; Kopytine, M.; Koralt, I.; Korsch, W.; Kotchenda, L.; Kouchpil, V.; Kravtsov, P.; Kravtsov, V.; Krueger, K.; Krus, M.; Kuhn, C.; Kumar, L.; Kurnadi, P.; Lamont, M.; Landgraf, J.; LaPointe, S.; Lauret, J.; Lebedev, A.; Lednicky, R.; Lee, C-H.; Lee, J.; Leight, W.; LeVine, M.; Li, C.; Li, N.; Li, Y.; Lin, G.; Lindenbaum, S.; Lisa, M.; Liu, F.; Liu, H.; Liu, J.; Liu, L.; Ljubicic, T.; Llope, W.; Longacre, R.; Love, W.; Lu, Y.; Ludlam, T.; Ma, G.; Ma, Y.; Mahapatra, D.; Majka, R.; Mall, O.; Mangotra, L.; Manweiler, R.; Margetis, S.; Markert, C.; Masui, H.; Matis, H.; Matulenko, Yu.; McDonald, D.; McShane, T.; Meschanin, A.; Milner, R.; Minaev, N.; Mioduszewski, S.; Mischke, A.; Mohanty, B.; Morozov, D.; Munhoz, M.; Nandi, B.; Nattrass, C.; Nayak, T.; Nelson, J.; Netrakanti, P.; Ng, M.; Nogach, L.; Nurushev, S.; Odyniec, G.; Ogawa, A.; Okada, H.; Okorokov, V.; Olson, D.; Pachr, M.; Page, B.; Pal, S.; Pandit, Y.; Panebratsev, Y.; Pawlak, T.; Peitzmann, T.; Perevoztchikov, V.; Perkins, C.; Peryt, W.; Phatak, S.; Pile, P.; Planinic, M.; Ploskon, M.; Pluta, J.; Plyku, D.; Poljak, N.; Poskanzer, A.; Potukuchi, B.; Prindle, D.; Pruneau, C.; Pruthi, N.; Pujahari, P.; Putschke, J.; Raniwala, R.; Raniwala, S.; Ray, R.; Redwine, R.; Reed, R.; Ridiger, A.; Ritter, H.; Roberts, J.; Rogachevskiy, O.; Romero, J.; Rose, A.; Roy, C.; Ruan, L.; Russcher, M.; Sahoo, R.; Sakai, S.; Sakrejda, I.; Sakuma, T.; Salur, S.; Sandweiss, J.; Sarsour, M.; Schambach, J.; Scharenberg, R.; Schmitz, N.; Seger, J.; Selyuzhenkov, I.; Seyboth, P.; Shabetai, A.; Shahaliev, E.; Shao, M.; Sharma, M.; Shi, S.; Shi, X-H.; Sichtermann, E.; Simon, F.; Singaraju, R.; Skoby, M.; Smirnov, N.; Sorensen, P.; Sowinski, J.; Spinka, H.; Srivastava, B.; Stanislaus, T.; Staszak, D.; Strikhanov, M.; Stringfellow, B.; Suaide, A.; Suarez, M.; Subba, N.; Sumbera, M.; Sun, X.; Sun, Y.; Sun, Z.; Surrow, B.; Symons, T.; Szanto de Toledo, A.; Takahashi, J.; Tang, A.; Tang, Z.; Tarini, L.; Tarnowsky, T.; Thein, D.; Thomas, J.; Tian, J.; Timmins, A.; Timoshenko, S.; Tlusty, D.; Tokarev, M.; Trainor, T.; Tram, V.; Trentalange, S.; Tribble, R.; Tsai, O.; Ulery, J.; Ullrich, T.; Underwood, D.; Van Buren, G.; van Nieuwenhuizen, G.; Vanfossen, J.; Varma, R.; Vasconcelos, G.; Vasiliev, A.; Videbaek, F.; Vigdor, S.; Viyogi, Y.; Vokal, S.; Voloshin, S.; Wada, M.; Walker, M.; Wang, F.; Wang, G.; Wang, H.; Wang, J.; Wang, Q.; Wang, X.; Wang, X.; Wang, Y.; Webb, G.; Webb, J.; Westfall, G.; Whitten, C.; Wieman, H.; Wissink, S.; Witt, R.; Wu, Y.; Xie, W.; Xu, N.; Xu, Q.; Xu, Y.; Xu, Z.; Yang, Y.; Yepes, P.; Yip, K.; Yoo, I-K.; Yue, Q.; Zawisza, M.; Zbroszczyk, H.; Zhan, W.; Zhang, S.; Zhang, W.; Zhang, X.; Zhang, Y.; Zhang, Z.; Zhao, Y.; Zhong, C.; Zhou, J.; Zhu, X.; Zoulkarneev, R.; Zoulkarneeva, Y.; Zuo, J.

Author(s)

Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross Cameron; Hoffman, A. M.; Jones, Christopher LaDon; ... Show more

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Abstract

Charged-particle spectra associated with direct photon (γdir) and pi0 are measured in p+p and Au+Au collisions at center-of-mass energy [sqrt]sNN=200 GeV with the STAR detector at the Relativistic Heavy Ion Collider. A shower-shape analysis is used to partially discriminate between γdir and pi0. Assuming no associated charged particles in the γdir direction (near side) and small contribution from fragmentation photons (γfrag), the associated charged-particle yields opposite to γdir (away side) are extracted. In central Au+Au collisions, the charged-particle yields at midrapidity (|η|<1) and high transverse momentum (3<pT[superscript assoc]<16 GeV/c) associated with γdir and pi0 (|η|<0.9, 8<pT[superscript trig]<16 GeV/c) are suppressed by a factor of 3–5 compared with p+p collisions. The observed suppression of the associated charged particles is similar for γdir and pi0 and independent of the γdir energy within uncertainties. These measurements indicate that, in the kinematic range covered and within our current experimental uncertainties, the parton energy loss shows no sensitivity to the parton initial energy, path length, or color charge.

Date issued

2010-12

URI

http://hdl.handle.net/1721.1/60666

Department

Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science

Journal

Physical Review C

Publisher

American Physical Society

Citation

STAR Collaboration et al. “Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations.” Physical Review C 82.3 (2010): 034909. © 2010 The American Physical Society.

Version: Final published version

ISSN

0556-2813

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