Phys. Rev. D 71, 071102 (2005) [7 pages]
Midrapidity direct-photon production in p+p collisions at sqrt[s]=200 GeV
S. S. Adler et al. PHENIX Collaboration
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S. S. Adler5, S. Afanasiev17, C. Aidala5, N. N. Ajitanand43, Y. Akiba20,38, J. Alexander43, R. Amirikas12, L. Aphecetche45, S. H. Aronson5, R. Averbeck44, T. C. Awes35, R. Azmoun44, V. Babintsev15, A. Baldisseri10, K. N. Barish6, P. D. Barnes27, B. Bassalleck33, S. Bathe30, S. Batsouli9, V. Baublis37, A. Bazilevsky39,15, S. Belikov16,15, Y. Berdnikov40, S. Bhagavatula16, J. G. Boissevain27, H. Borel10, S. Borenstein25, M. L. Brooks27, D. S. Brown34, N. Bruner33, D. Bucher30, H. Buesching30, V. Bumazhnov15, G. Bunce5,39, J. M. Burward-Hoy26,44, S. Butsyk44, X. Camard45, J.-S. Chai18, P. Chand4, W. C. Chang2, S. Chernichenko15, C. Y. Chi9, J. Chiba20, M. Chiu9, I. J. Choi52, J. Choi19, R. K. Choudhury4, T. Chujo5, V. Cianciolo35, Y. Cobigo10, B. A. Cole9, P. Constantin16, D. d’Enterria45, G. David5, H. Delagrange45, A. Denisov15, A. Deshpande39, E. J. Desmond5, A. Devismes44, O. Dietzsch41, O. Drapier25, A. Drees44, K. A. Drees5, R. du Rietz29, A. Durum15, D. Dutta4, Y. V. Efremenko35, K. El Chenawi49, A. Enokizono14, H. En’yo38,39, S. Esumi48, L. Ewell5, D. E. Fields33,39, F. Fleuret25, S. L. Fokin23, B. D. Fox39, Z. Fraenkel51, J. E. Frantz9, A. Franz5, A. D. Frawley12, S.-Y. Fung6, S. Garpman29 *, T. K. Ghosh49, A. Glenn46, G. Gogiberidze46, M. Gonin25, J. Gosset10, Y. Goto39, R. Granier de Cassagnac25, N. Grau16, S. V. Greene49, M. Grosse Perdekamp39, W. Guryn5, H.-Å. Gustafsson29, T. Hachiya14, J. S. Haggerty5, H. Hamagaki8, A. G. Hansen27, E. P. Hartouni26, M. Harvey5, R. Hayano8, N. Hayashi38, X. He13, M. Heffner26, T. K. Hemmick44, J. M. Heuser44, M. Hibino50, J. C. Hill16, W. Holzmann43, K. Homma14, B. Hong22, A. Hoover34, T. Ichihara38,39, V. V. Ikonnikov23, K. Imai24,38, D. Isenhower1, M. Ishihara38, M. Issah43, A. Isupov17, B. V. Jacak44, W. Y. Jang22, Y. Jeong19, J. Jia44, O. Jinnouchi38, B. M. Johnson5, S. C. Johnson26, K. S. Joo31, D. Jouan36, S. Kametani8,50, N. Kamihara47,38, J. H. Kang52, S. S. Kapoor4, K. Katou50, S. Kelly9, B. Khachaturov51, A. Khanzadeev37, J. Kikuchi50, D. H. Kim31, D. J. Kim52, D. W. Kim19, E. Kim42, G.-B. Kim25, H. J. Kim52, E. Kistenev5, A. Kiyomichi48, K. Kiyoyama32, C. Klein-Boesing30, H. Kobayashi38,39, L. Kochenda37, V. Kochetkov15, D. Koehler33, T. Kohama14, M. Kopytine44, D. Kotchetkov6, A. Kozlov51, P. J. Kroon5, C. H. Kuberg1,27, K. Kurita39, Y. Kuroki48, M. J. Kweon22, Y. Kwon52, G. S. Kyle34, R. Lacey43, V. Ladygin17, J. G. Lajoie16, A. Lebedev16,23, S. Leckey44, D. M. Lee27, S. Lee19, M. J. Leitch27, X. H. Li6, H. Lim42, A. Litvinenko17, M. X. Liu27, Y. Liu36, C. F. Maguire49, Y. I. Makdisi5, A. Malakhov17, V. I. Manko23, Y. Mao7,38, G. Martinez45, M. D. Marx44, H. Masui48, F. Matathias44, T. Matsumoto8,50, P. L. McGaughey27, E. Melnikov15, F. Messer44, Y. Miake48, J. Milan43, T. E. Miller49, A. Milov44,51, S. Mioduszewski5, R. E. Mischke27, G. C. Mishra13, J. T. Mitchell5, A. K. Mohanty4, D. P. Morrison5, J. M. Moss27, F. Mühlbacher44, D. Mukhopadhyay51, M. Muniruzzaman6, J. Murata38,39, S. Nagamiya20, J. L. Nagle9, T. Nakamura14, B. K. Nandi6, M. Nara48, J. Newby46, P. Nilsson29, A. S. Nyanin23, J. Nystrand29, E. O’Brien5, C. A. Ogilvie16, H. Ohnishi5,38, I. D. Ojha49,3, K. Okada38, M. Ono48, V. Onuchin15, A. Oskarsson29, I. Otterlund29, K. Oyama8, K. Ozawa8, D. Pal51, A. P. T. Palounek27, V. Pantuev44, V. Papavassiliou34, J. Park42, A. Parmar33, S. F. Pate34, T. Peitzmann30, J.-C. Peng27, V. Peresedov17, C. Pinkenburg5, R. P. Pisani5, F. Plasil35, M. L. Purschke5, A. K. Purwar44, J. Rak16, I. Ravinovich51, K. F. Read35,46, M. Reuter44, K. Reygers30, V. Riabov37,40, Y. Riabov37, G. Roche28, A. Romana25, M. Rosati16, P. Rosnet28, S. S. Ryu52, M. E. Sadler1, N. Saito38,39, T. Sakaguchi8,50, M. Sakai32, S. Sakai48, V. Samsonov37, L. Sanfratello33, R. Santo30, H. D. Sato24,38, S. Sato5,48, S. Sawada20, Y. Schutz45, V. Semenov15, R. Seto6, M. R. Shaw1,27, T. K. Shea5, T.-A. Shibata47,38, K. Shigaki14,20, T. Shiina27, C. L. Silva41, D. Silvermyr27,29, K. S. Sim22, C. P. Singh3, V. Singh3, M. Sivertz5, A. Soldatov15, R. A. Soltz26, W. E. Sondheim27, S. P. Sorensen46, I. V. Sourikova5, F. Staley10, P. W. Stankus35, E. Stenlund29, M. Stepanov34, A. Ster21, S. P. Stoll5, T. Sugitate14, J. P. Sullivan27, E. M. Takagui41, A. Taketani38,39, M. Tamai50, K. H. Tanaka20, Y. Tanaka32, K. Tanida38, M. J. Tannenbaum5, P. Tarján11, J. D. Tepe1,27, T. L. Thomas33, J. Tojo24,38, H. Torii24,38, R. S. Towell1, I. Tserruya51, H. Tsuruoka48, S. K. Tuli3, H. Tydesjö29, N. Tyurin15, H. W. van Hecke27, J. Velkovska5,44, M. Velkovsky44, V. Veszprémi11, L. Villatte46, A. A. Vinogradov23, M. A. Volkov23, E. Vznuzdaev37, X. R. Wang13, Y. Watanabe38,39, S. N. White5, F. K. Wohn16, C. L. Woody5, W. Xie6, Y. Yang7, A. Yanovich15, S. Yokkaichi38,39, G. R. Young35, I. E. Yushmanov23, W. A. Zajc9 †, C. Zhang9, S. Zhou7, S. J. Zhou51, and L. Zolin17 (PHENIX Collaboration)
1Abilene Christian University, Abilene, Texas 79699, USA
2Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
3Department of Physics, Banaras Hindu University, Varanasi 221005, India
4Bhabha Atomic Research Centre, Bombay 400 085, India
5Brookhaven National Laboratory, Upton, New York 11973-5000, USA
6University of California–Riverside, Riverside, California 92521, USA
7China Institute of Atomic Energy (CIAE), Beijing, People’s Republic of China
8Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
9Columbia University, New York, New York 10027, USA, and Nevis Laboratories, Irvington, New York 10533, USA
10Dapnia, CEA Saclay, F-91191, Gif-sur-Yvette, France
11Debrecen University, H-4010 Debrecen, Egyetem tér 1, Hungary
12Florida State University, Tallahassee, Florida 32306, USA
13Georgia State University, Atlanta, Georgia 30303, USA
14Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
15Institute for High Energy Physics (IHEP), Protvino, Russia
16Iowa State University, Ames, Iowa 50011, USA
17Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
18KAERI, Cyclotron Application Laboratory, Seoul, Korea
19Kangnung National University, Kangnung 210-702, Korea
20KEK, High Energy Accelerator Research Organization, Tsukuba-shi, Ibaraki-ken 305-0801, Japan
21KFKI Research Institute for Particle and Nuclear Physics (RMKI), H-1525 Budapest 114, P.O. Box 49, Hungary
22Korea University, Seoul, 136-701, Korea
23Russian Research Center “Kurchatov Institute,” Moscow, Russia
24Kyoto University, Kyoto 606-8502, Japan
25Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128, Palaiseau, France
26Lawrence Livermore National Laboratory, Livermore, California 94550, USA
27Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
28LPC, Université Blaise Pascal, CNRS-IN2P3, Clermont-Fd, 63177 Aubiere Cedex, France
29Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden
30Institut für Kernphysik, University of Muenster, D-48149 Muenster, Germany
31Myongji University, Yongin, Kyonggido 449-728, Korea
32Nagasaki Institute of Applied Science, Nagasaki-shi, Nagasaki 851-0193, Japan
33University of New Mexico, Albuquerque, New Mexico 87131, USA
34New Mexico State University, Las Cruces, New Mexico 88003, USA
35Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
36IPN-Orsay, Universite Paris Sud, CNRS-IN2P3, BP1, F-91406, Orsay, France
37PNPI, Petersburg Nuclear Physics Institute, Gatchina, Russia
38RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan
39RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
40St. Petersburg State Technical University, St. Petersburg, Russia
41Instituto de Física, Universidade de São Paulo, Caixa Postal 66318, São Paulo CEP05315-970, Brazil
42System Electronics Laboratory, Seoul National University, Seoul, Korea
43Chemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USA
44Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USA
45SUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes), BP 20722-44307, Nantes, France
46University of Tennessee, Knoxville, Tennessee 37996, USA
47Department of Physics, Tokyo Institute of Technology, Tokyo, 152-8551, Japan
48Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
49Vanderbilt University, Nashville, Tennessee 37235, USA
50Waseda University, Advanced Research Institute for Science and Engineering, 17 Kikui-cho, Shinjuku-ku, Tokyo 162-0044, Japan
51Weizmann Institute, Rehovot 76100, Israel
52Yonsei University, IPAP, Seoul 120-749, Korea
Received 2 February 2005; published 8 April 2005
A measurement of direct photons in p+p collisions at sqrt[s]=200 GeV is presented. A photon excess above background from π0→γ+γ, η→γ+γ and other decays is observed in the transverse momentum range 5.5<pT<7 GeV/c. The result is compared to a next-to-leading-order perturbative QCD calculation. Within errors, good agreement is found between the QCD calculation and the measured result.
©2005 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevD.71.071102
DOI: 10.1103/PhysRevD.71.071102
PACS: 13.85.Qk, 25.75.Dw
* Deceased.
† PHENIX spokesperson. Electronic address: zajc@nevis.columbia.edu
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