Phys. Rev. Lett.
98,
012002
(2007)
[6 pages]
Measurement of Direct Photon Production in p+p Collisions at √s=200 GeV
S. S. Adler et al. PHENIX Collaboration
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S. S. Adler5, S. Afanasiev20, C. Aidala10, N. N. Ajitanand44, Y. Akiba21,40, A. Al-Jamel35, J. Alexander44, K. Aoki25, L. Aphecetche46, R. Armendariz35, S. H. Aronson5, R. Averbeck45, T. C. Awes36, V. Babintsev17, A. Baldisseri11, K. N. Barish6, P. D. Barnes28, B. Bassalleck34, S. Bathe6,31, S. Batsouli10, V. Baublis39, F. Bauer6, A. Bazilevsky5,41, S. Belikov19,17, M. T. Bjorndal10, J. G. Boissevain28, H. Borel11, M. L. Brooks28, D. S. Brown35, N. Bruner34, D. Bucher31, H. Buesching5,31, V. Bumazhnov17, G. Bunce5,41, J. M. Burward-Hoy28,27, S. Butsyk45, X. Camard46, P. Chand4, W. C. Chang2, S. Chernichenko17, C. Y. Chi10, J. Chiba21, M. Chiu10, I. J. Choi53, R. K. Choudhury4, T. Chujo5, V. Cianciolo36, Y. Cobigo11, B. A. Cole10, M. P. Comets37, P. Constantin19, M. Csanád13, T. Csörgő22, J. P. Cussonneau46, D. d’Enterria10, K. Das14, G. David5, F. Deák13, H. Delagrange46, A. Denisov17, A. Deshpande41, E. J. Desmond5, A. Devismes45, O. Dietzsch42, J. L. Drachenberg1, O. Drapier26, A. Drees45, A. Durum17, D. Dutta4, V. Dzhordzhadze47, Y. V. Efremenko36, H. En’yo40,41, B. Espagnon37, S. Esumi49, D. E. Fields34,41, C. Finck46, F. Fleuret26, S. L. Fokin24, B. D. Fox41, Z. Fraenkel52, J. E. Frantz10, A. Franz5, A. D. Frawley14, Y. Fukao25,40,41, S.-Y. Fung6, S. Gadrat29, M. Germain46, A. Glenn47, M. Gonin26, J. Gosset11, Y. Goto40,41, R. Granier de Cassagnac26, N. Grau19, S. V. Greene50, M. Grosse Perdekamp18,41, H.-Å. Gustafsson30, T. Hachiya16, J. S. Haggerty5, H. Hamagaki8, A. G. Hansen28, E. P. Hartouni27, M. Harvey5, K. Hasuko40, R. Hayano8, X. He15, M. Heffner27, T. K. Hemmick45, J. M. Heuser40, P. Hidas22, H. Hiejima18, J. C. Hill19, R. Hobbs34, W. Holzmann44, K. Homma16, B. Hong23, A. Hoover35, T. Horaguchi40,41,48, T. Ichihara40,41, V. V. Ikonnikov24, K. Imai25,40, M. Inaba49, M. Inuzuka8, D. Isenhower1, L. Isenhower1, M. Ishihara40, M. Issah44, A. Isupov20, B. V. Jacak45, J. Jia45, O. Jinnouchi40,41, B. M. Johnson5, S. C. Johnson27, K. S. Joo32, D. Jouan37, F. Kajihara8, S. Kametani8,51, N. Kamihara40,48, M. Kaneta41, J. H. Kang53, K. Katou51, T. Kawabata8, A. V. Kazantsev24, S. Kelly9,10, B. Khachaturov52, A. Khanzadeev39, J. Kikuchi51, D. J. Kim53, E. Kim43, G.-B. Kim26, H. J. Kim53, E. Kinney9, A. Kiss13, E. Kistenev5, A. Kiyomichi40, C. Klein-Boesing31, H. Kobayashi41, L. Kochenda39, V. Kochetkov17, R. Kohara16, B. Komkov39, M. Konno49, D. Kotchetkov6, A. Kozlov52, P. J. Kroon5, C. H. Kuberg1,*, G. J. Kunde28, K. Kurita40, M. J. Kweon23, Y. Kwon53, G. S. Kyle35, R. Lacey44, J. G. Lajoie19, Y. Le Bornec37, A. Lebedev19,24, S. Leckey45, D. M. Lee28, M. J. Leitch28, M. A. L. Leite42, X. H. Li6, H. Lim43, A. Litvinenko20, M. X. Liu28, C. F. Maguire50, Y. I. Makdisi5, A. Malakhov20, V. I. Manko24, Y. Mao38,40, G. Martinez46, H. Masui49, F. Matathias45, T. Matsumoto8,51, M. C. McCain1, P. L. McGaughey28, Y. Miake49, T. E. Miller50, A. Milov45, S. Mioduszewski5, G. C. Mishra15, J. T. Mitchell5, A. K. Mohanty4, D. P. Morrison5, J. M. Moss28, D. Mukhopadhyay52, M. Muniruzzaman6, S. Nagamiya21, J. L. Nagle9,10, T. Nakamura16, J. Newby47, A. S. Nyanin24, J. Nystrand30, E. O’Brien5, C. A. Ogilvie19, H. Ohnishi40, I. D. Ojha3,50, H. Okada25,40, K. Okada40,41, A. Oskarsson30, I. Otterlund30, K. Oyama8, K. Ozawa8, D. Pal52, A. P. T. Palounek28, V. Pantuev45, V. Papavassiliou35, J. Park43, W. J. Park23, S. F. Pate35, H. Pei19, V. Penev20, J.-C. Peng18, H. Pereira11, V. Peresedov20, A. Pierson34, C. Pinkenburg5, R. P. Pisani5, M. L. Purschke5, A. K. Purwar45, J. M. Qualls1, J. Rak19, I. Ravinovich52, K. F. Read36,47, M. Reuter45, K. Reygers31, V. Riabov39, Y. Riabov39, G. Roche29, A. Romana26,*, M. Rosati19, S. S. E. Rosendahl30, P. Rosnet29, V. L. Rykov40, S. S. Ryu53, N. Saito25,40,41, T. Sakaguchi8,51, S. Sakai49, V. Samsonov39, L. Sanfratello34, R. Santo31, H. D. Sato25,40, S. Sato5,49, S. Sawada21, Y. Schutz46, V. Semenov17, R. Seto6, T. K. Shea5, I. Shein17, T.-A. Shibata40,48, K. Shigaki16, M. Shimomura49, A. Sickles45, C. L. Silva42, D. Silvermyr28, K. S. Sim23, A. Soldatov17, R. A. Soltz27, W. E. Sondheim28, S. P. Sorensen47, I. V. Sourikova5, F. Staley11, P. W. Stankus36, E. Stenlund30, M. Stepanov35, A. Ster22, S. P. Stoll5, T. Sugitate16, J. P. Sullivan28, S. Takagi49, E. M. Takagui42, A. Taketani40,41, K. H. Tanaka21, Y. Tanaka33, K. Tanida40, M. J. Tannenbaum5, A. Taranenko44, P. Tarján12, T. L. Thomas34, M. Togawa25,40, J. Tojo40, H. Torii25,41, R. S. Towell1, V-N. Tram26, I. Tserruya52, Y. Tsuchimoto16, H. Tydesjö30, N. Tyurin17, T. J. Uam32, J. Velkovska5, M. Velkovsky45, V. Veszprémi12, A. A. Vinogradov24, M. A. Volkov24, E. Vznuzdaev39, X. R. Wang15, Y. Watanabe40,41, S. N. White5, N. Willis37, F. K. Wohn19, C. L. Woody5, W. Xie6, A. Yanovich17, S. Yokkaichi40,41, G. R. Young36, I. E. Yushmanov24, W. A. Zajc10,†, O. Zaudtke31, C. Zhang10, S. Zhou7, J. Zimányi22,*, L. Zolin20, X. Zong19, and H. W. vanHecke28 (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
9University of Colorado, Boulder, Colorado 80309, USA
10Columbia University, New York, New York 10027, USA, and Nevis Laboratories, Irvington, New York 10533, USA
11Dapnia, CEA Saclay, F-91191, Gif-sur-Yvette, France
12Debrecen University, H-4010 Debrecen, Egyetem tér 1, Hungary
13ELTE, Eötvös Loránd University, H-1117 Budapest, Pázmány P. s. 1/A, Hungary
14Florida State University, Tallahassee, Florida 32306, USA
15Georgia State University, Atlanta, Georgia 30303, USA
16Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
17IHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, Russia
18University of Illinois at Urbana—Champaign, Urbana, Illinois 61801, USA
19Iowa State University, Ames, Iowa 50011, USA
20Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
21KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
22KFKI Research Institute for Particle and Nuclear Physics of the Hungarian Academy of Sciences (MTA KFKI RMKI), H-1525 Budapest 114, P.O. Box 49, Budapest, Hungary
23Korea University, Seoul 136-701, Korea
24Russian Research Center “Kurchatov Institute,” Moscow, Russia
25Kyoto University, Kyoto 606-8502, Japan
26Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128 Palaiseau, France
27Lawrence Livermore National Laboratory, Livermore, California 94550, USA
28Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
29LPC, Université Blaise Pascal, CNRS-IN2P3, Clermont-Fd, 63177 Aubiere Cedex, France
30Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden
31Institut für Kernphysik, University of Muenster, D-48149 Muenster, Germany
32Myongji University, Yongin, Kyonggido 449-728, Korea
33Nagasaki Institute of Applied Science, Nagasaki-shi, Nagasaki 851-0193, Japan
34University of New Mexico, Albuquerque, New Mexico 87131, USA
35New Mexico State University, Las Cruces, New Mexico 88003, USA
36Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
37IPN-Orsay, Universite Paris Sud, CNRS-IN2P3, BP1, F-91406 Orsay, France
38Peking University, Beijing, People’s Republic of China
39PNPI, Petersburg Nuclear Physics Institute, Gatchina, Leningrad Region 188300, Russia
40RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan
41RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
42Instituto de Física, Universidade de São Paulo, Caixa Postal 66318, São Paulo CEP05315-970, Brazil
43System Electronics Laboratory, Seoul National University, Seoul, Korea
44Chemistry Department, Stony Brook University, Stony Brook, SUNY, New York 11794-3400, USA
45Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USA
46SUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes), BP 20722-44307, Nantes, France
47University of Tennessee, Knoxville, Tennessee 37996, USA
48Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152-8551, Japan
49Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
50Vanderbilt University, Nashville, Tennessee 37235, USA
51Advanced Research Institute for Science and Engineering, Waseda University, 17 Kikui-cho, Shinjuku-ku, Tokyo 162-0044, Japan
52Weizmann Institute, Rehovot 76100, Israel
53Yonsei University, IPAP, Seoul 120-749, Korea
Received 18 September 2006; published 5 January 2007
Cross sections for midrapidity production of direct photons in p+p collisions at the Relativistic Heavy Ion Collider (RHIC) are reported for transverse momenta of 3<pT<16 GeV/c. Next-to-leading order perturbative QCD (pQCD) describes the data well for pT>5 GeV/c, where the uncertainties of the measurement and theory are comparable. We also report on the effect of requiring the photons to be isolated from parton jet energy. The observed fraction of isolated photons is well described by pQCD for pT>7 GeV/c.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.012002
DOI:
10.1103/PhysRevLett.98.012002
*Deceased. †PHENIX Spokesperson. Electronic address: zajc@nevis.columbia.edu
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