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Preprint
Report number nucl-ex/0401008
Title Photon and neutral pion production in Au+Au collisions at sqrt(s_{NN}) = 130 GeV
Author(s) Adams, J ; Adler, C ; Aggarwal, M M ; Ahammed, Z ; Amonett, J ; Anderson, B D ; Anderson, M ; Arkhipkin, D ; Averichev, G S ; Badyal, S K ; Balewski, J ; Barannikova, O ; Barnby, L S ; Baudot, J ; Bekele, S ; Belaga, V V ; Bellwied, R ; Berger, J ; Bezverkhny, B I ; Bhardwaj, S ; Bhaskar, P ; Bhati, A K ; Bichsel, H ; Billmeier, A ; Bland, L C ; Blyth, C O ; Bonner, B E ; Botje, M ; Boucham, A ; Brandin, A ; Bravar, A ; Cadman, R V ; Cai, X Z ; Caines, H ; Calderón de la Barca-Sanchez, M ; Carroll, J ; Castillo, J ; Castro, M ; Cebra, D ; Chaloupka, P ; Chattopadhyay, S ; Chen, H F ; Chen, Y ; Chernenko, S P ; Cherney, M ; Chikanian, A ; Choi, B ; Christie, W ; Coffin, J P ; Cormier, T M ; Cramer, J G ; Crawford, H J ; Das, D ; Das, S ; Derevshchikov, A A ; Didenko, L ; Dietel, T ; Dong, X ; Draper, J E ; Du, F ; Dubey, A K ; Dunin, V B ; Dunlop, J C ; Dutta-Majumdar, M R ; Eckardt, V ; Efimov, L G ; Emelianov, V ; Engelage, J ; Eppley, G ; Erazmus, B ; Estienne, M ; Fachini, P ; Faine, V ; Faivre, J ; Fatemi, R ; Filimonov, K ; Filip, P ; Finch, E ; Fisyak, Yu ; Flierl, D ; Foley, K J ; Fu, J ; Gagliardi, C A ; Ganti, M S ; Gutíerrez, T D ; Gagunashvili, N ; Gans, J ; Gaudichet, L ; Germain, M ; Geurts, F J M ; Ghazikhanian, V ; Ghosh, P ; González, J E ; Grachov, O ; Grigoriev, V ; Gronstal, S ; Grosnick, D P ; Guedon, M ; Guertin, S M ; Sen-Gupta, A ; Gushin, E ; Hallman, T J ; Hardtke, D ; Harris, J W ; Heinz, M ; Henry, T W ; Heppelmann, S ; Herston, T ; Hippolyte, B ; Hirsch, A ; Hjort, E ; Hoffmann, G W ; Horsley, M ; Huang, H Z ; Huang Sheng Li ; Humanic, T J ; Igo, G ; Ishihara, A ; Jacobs, P ; Jacobs, W W ; Janik, M ; Johnson, I ; Jones, P G ; Judd, E G ; Kabana, S ; Kaneta, M ; Kaplan, M ; Keane, D ; Kiryluk, J ; Kisiel, A ; Klay, J ; Klein, S R ; Klyachko, A ; Koetke, D D ; Kollegger, T ; Konstantinov, A S ; Kopytine, M ; Kotchenda, L ; Kovalenko, A D ; Krämer, M ; Kravtsov, P ; Krüger, K ; Kuhn, C ; Kulikov, A I ; Kumar, A ; Kunde, G J ; Kunz, C L ; Kutuev, R K ; Kuznetsov, A A ; Lamont, M A C ; Landgraf, J M ; Lange, S ; Lansdell, C P ; Lasiuk, B ; Laue, F ; Lauret, J ; Lebedev, A ; Lednicky, R ; Leontiev, V M ; Le Vine, M J ; Li, C ; Li, Q ; Lindenbaum, S J ; Lisa, M A ; Liu, F ; Liu, L ; Liu, Z ; Liu, Q J ; Ljubicic, T ; Llope, W J ; Long, H ; Longacre, R S ; López-Noriega, M ; Love, W A ; Ludlam, T ; Lynn, D ; Ma, J ; Ma, Y G ; Magestro, D ; Mahajan, S ; Mangotra, L K ; Mahapatra, D P ; Majka, R ; Manweiler, R ; Margetis, S ; Markert, C ; Martin, L ; Marx, J ; Matis, H S ; Matulenko, Yu A ; McShane, T S ; Meissner, F ; Melnik, Yu M ; Meschanin, A ; Messer, M ; Miller, M L ; Milosevich, Z ; Minaev, N G ; Mironov, C ; Mishra, D ; Mitchell, J ; Mohanty, B ; Molnár, L ; Moore, C F ; Mora-Corral, M J ; Morozov, V ; Moura ; Munhoz, M G ; Nandi, B K ; Nayak, S K ; Nayak, T K ; Nelson, J M ; Nevski, P ; Nikitin, V A ; Nogach, L V ; Norman, B ; Nurushev, S B ; Odyniec, Grazyna Janina ; Ogawa, A ; Okorokov, V ; Oldenburg, M ; Olson, D ; Paic, G ; Pandey, S U ; Pal, S K ; Panebratsev, Yu A ; Panitkin, S Y ; Pavlinov, A I ; Pawlak, T ; Perevozchikov, V ; Peryt, W ; Petrov, V A ; Phatak, S C ; Picha, R ; Planinic, M ; Pluta, J ; Porile, N ; Porter, J ; Poskanzer, A M ; Potekhin, M V ; Potrebenikova, E V ; Potukuchi, B V K S ; Prindle, D ; Pruneau, C A ; Putschke, J ; Rai, G ; Rakness, G ; Raniwala, R ; Raniwala, S ; Ravel, O ; Ray, R L ; Razin, S V ; Reichhold, D M ; Reid, J G ; Renault, G ; Retière, F ; Ridiger, A ; Ritter, H G ; Roberts, J B ; Rogachevski, O V ; Romero, J L ; Rose, A ; Roy, C ; Ruan, L J ; Sahoo, R ; Sakrejda, I ; Salur, S ; Sandweiss, J ; Savin, I ; Schambach, J ; Scharenberg, R P ; Schmitz, N ; Schröder, L S ; Schweda, K ; Seger, J ; Seliverstov, D M ; Seyboth, P ; Shahaliev, E ; Shao, M ; Sharma, M ; Shestermanov, K E ; Shimansky, S S ; Singaraju, R N ; Simon, F ; Skoro, G P ; Smirnov, N ; Snellings, R ; Sood, G ; Sørensen, P ; Sowinski, J ; Spinka, H M ; Srivastava, B ; Stanislaus, S ; Stock, R ; Stolpovsky, A ; Strikhanov, M N ; Stringfellow, B C ; Struck, C ; Suaide, A A P ; Sugarbaker, E R ; Suire, C ; Sumbera, M ; Surrow, B ; Symons, T J M ; Szanto de Toledo, A ; Szarwas, P ; Tai, A ; Takahashi, J ; Tang, A H ; Thein, D ; Thomas, J H ; Tikhomirov, V ; Tokarev, M ; Tonjes, M B ; Trainor, T A ; Trentalange, S ; Tribble, R E ; Trivedi, M D ; Trofimov, V ; Tsai, O ; Ullrich, T ; Underwood, D G ; Van Buren, G ; Van der Molen, A M ; Vasilev, A N ; Vasilev, M ; Vigdor, S E ; Viyogi, Y P ; Voloshin, S A ; Waggoner, W ; Wang, F ; Wang, G ; Wang, X L ; Wang, Z M ; Ward, H ; Watson, J W ; Wells, R ; Westfall, G D ; Whitten, C ; Wieman, H ; Willson, R ; Wissink, S W ; Witt, R ; Wood, J ; Wu, J ; Xu, N ; Xu, Z ; Xu, Z Z ; Yakutin, A E ; Yamamoto, E ; Yang, J ; Yepes, P ; Yurevich, V I ; Zanevsky, Yu V ; Zborovský, I ; Zhang, H ; Zhang, H Y ; Zhang, W M ; Zhang, Z P ; Zolnierczuk, P A ; Zoulkarneev, R ; Zoulkarneeva, Y ; Zubarev, A N
Publication 2004
Imprint 8 Jan 2004
Number of pages 13
Published in: Phys. Rev.
Subject category Nuclear Physics - Experiment
Abstract We report the first inclusive photon measurements about mid-rapidity (|y|<0.5) from Au+Au collisions at sqrt(s_{NN}) = 130 GeV at RHIC. Photon pair conversions were reconstructed from electron and positron tracks measured with the Time Projection Chamber (TPC) of the STAR experiment. With this method, an energy resolution of Delta(E)/E = 2% at 0.5 GeV has been achieved. Reconstructed photons have also been used to measure the transverse momentum (pt) spectra of pi0 mesons about mid-rapidity (|y|<1) via the pi0 -> photon photon decay channel. The fractional contribution of the pi0 -> photon photon decay to the inclusive photon spectrum decreases by 20% +/- 5% between pt = 1.65 GeV/c and pt = 2.4 GeV/c in the most central events, indicating that relative to pi0 -> photon photon decay the contribution of other photon sources is substantially increasing.
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Submitted by ian.johnson@cern.ch

 


 Записът е създаден на 2004-01-10, последна промяна на 2016-06-27


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