Phys. Rev. C
75,
024909
(2007)
[36 pages]
High transverse momentum η meson production in p+p,d+Au, and Au+Au collisions at √sNN=200 GeV
S. S. Adler et al. PHENIX Collaboration
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S. S. Adler5, S. Afanasiev20, C. Aidala5,10, N. N. Ajitanand47, Y. Akiba23,42, J. Alexander47, A. Al-Jamel37, R. Amirikas14, K. Aoki27, L. Aphecetche49, R. Armendariz37, S. H. Aronson5, R. Averbeck48, T. C. Awes38, R. Azmoun48, V. Babintsev17, A. Baldisseri11, K. N. Barish6, P. D. Barnes30, B. Bassalleck36, S. Bathe6,33, S. Batsouli10, V. Baublis41, F. Bauer6, A. Bazilevsky5,17,43, S. Belikov17,19, Y. Berdnikov44, S. Bhagavatula19, M. T. Bjorndal10, J. G. Boissevain30, H. Borel11, S. Borenstein28, M. L. Brooks30, D. S. Brown37, N. Bruner36, D. Bucher33, H. Buesching5,33, V. Bumazhnov17, G. Bunce5,43, J. M. Burward-Hoy29,30,48, S. Butsyk48, X. Camard49, J.-S. Chai21, P. Chand4, W. C. Chang2, S. Chernichenko17, J. Chiba23, C. Y. Chi10, M. Chiu10, I. J. Choi56, J. Choi22, R. K. Choudhury4, T. Chujo5, V. Cianciolo38, Y. Cobigo11, B. A. Cole10, M. P. Comets39, P. Constantin19, M. Csanád13, T. Csörgő24, J. P. Cussonneau49, K. Das14, G. David5, F. Deák13, H. Delagrange49, A. Denisov17, D. d'Enterria10,49, A. Deshpande43, E. J. Desmond5, A. Devismes48, O. Dietzsch45, J. L. Drachenberg1, O. Drapier28, A. Drees48, K. A. Drees5, R. duRietz32, A. Durum17, D. Dutta4, V. Dzhordzhadze50, Y. V. Efremenko38, K. El. Chenawi53, A. Enokizono16, H. En'yo42,43, B. Espagnon39, S. Esumi52, L. Ewell5, D. E. Fields36,43, C. Finck49, F. Fleuret28, S. L. Fokin26, B. D. Fox43, Z. Fraenkel55, J. E. Frantz10, A. Franz5, A. D. Frawley14, Y. Fukao27,42,43, S.-Y. Fung6, S. Gadrat31, S. Garpman32,*, M. Germain49, T. K. Ghosh53, A. Glenn50, G. Gogiberidze50, M. Gonin28, J. Gosset11, Y. Goto42,43, R. Granier de Cassagnac28, N. Grau19, S. V. Greene53, M. Grosse. Perdekamp18,43, W. Guryn5, H.-Å. Gustafsson32, T. Hachiya16, J. S. Haggerty5, H. Hamagaki8, A. G. Hansen30, E. P. Hartouni29, M. Harvey5, K. Hasuko42, R. Hayano8, N. Hayashi42, M. Heffner29, T. K. Hemmick48, J. M. Heuser42,48, X. He15, M. Hibino54, P. Hidas24, H. Hiejima18, J. C. Hill19, R. Hobbs36, W. Holzmann47, K. Homma16, B. Hong25, A. Hoover37, T. Horaguchi42,43,51, T. Ichihara42,43, V. V. Ikonnikov26, K. Imai27,42, M. Inaba52, M. Inuzuka8, D. Isenhower1, L. Isenhower1, M. Ishihara42, M. Issah47, A. Isupov20, B. V. Jacak48, W. Y. Jang25, Y. Jeong22, J. Jia48, O. Jinnouchi42,43, B. M. Johnson5, S. C. Johnson29, K. S. Joo34, D. Jouan39, F. Kajihara8, S. Kametani8,54, N. Kamihara42,51, M. Kaneta43, J. H. Kang56, S. S. Kapoor4, K. Katou54, M. Kaufman10, T. Kawabata8, A. V. Kazantsev26, S. Kelly9,10, B. Khachaturov55, A. Khanzadeev41, J. Kikuchi54, D. H. Kim34, D. J. Kim56, D. W. Kim22, E. Kim46, G.-B. Kim28, H. J. Kim56, E. Kinney9, A. Kiss13, E. Kistenev5, A. Kiyomichi42,52, K. Kiyoyama35, C. Klein-Boesing33, H. Kobayashi42,43, L. Kochenda41, V. Kochetkov17, D. Koehler36, T. Kohama16, R. Kohara16, B. Komkov41, M. Konno52, M. Kopytine48, D. Kotchetkov6, A. Kozlov55, P. J. Kroon5, C. H. Kuberg1,*, G. J. Kunde30, K. Kurita42,43, Y. Kuroki52, M. J. Kweon25, Y. Kwon56, G. S. Kyle37, R. Lacey47, V. Ladygin20, J. G. Lajoie19, A. Lebedev19,26, Y. Le. Bornec39, S. Leckey48, D. M. Lee30, S. Lee22, M. J. Leitch30, M. A. L. Leite45, H. Lim46, A. Litvinenko20, M. X. Liu30, Y. Liu39, X. H. Li6, C. F. Maguire53, Y. I. Makdisi5, A. Malakhov20, V. I. Manko26, Y. Mao7,40,42, G. Martinez49, M. D. Marx48, H. Masui52, F. Matathias48, T. Matsumoto8,54, M. C. McCain1, P. L. McGaughey30, E. Melnikov17, F. Messer48, Y. Miake52, J. Milan47, T. E. Miller53, A. Milov48,55, S. Mioduszewski5, R. E. Mischke30, G. C. Mishra15, J. T. Mitchell5, A. K. Mohanty4, D. P. Morrison5, J. M. Moss30, F. Mühlbacher48, D. Mukhopadhyay55, M. Muniruzzaman6, J. Murata42,43, S. Nagamiya23, J. L. Nagle9,10, T. Nakamura16, B. K. Nandi6, M. Nara52, J. Newby50, P. Nilsson32, A. S. Nyanin26, J. Nystrand32, E. O'Brien5, C. A. Ogilvie19, H. Ohnishi5,42, I. D. Ojha3,53, H. Okada27,42, K. Okada42,43, M. Ono52, V. Onuchin17, A. Oskarsson32, I. Otterlund32, K. Oyama8, K. Ozawa8, D. Pal55, A. P. T. Palounek30, V. Pantuev48, V. Papavassiliou37, J. Park46, W. J. Park25, A. Parmar36, S. F. Pate37, H. Pei19, T. Peitzmann33, V. Penev20, J.-C. Peng18,30, H. Pereira11, V. Peresedov20, A. Pierson36, C. Pinkenburg5, R. P. Pisani5, F. Plasil38, M. L. Purschke5, A. K. Purwar48, J. M. Qualls1, J. Rak19, I. Ravinovich55, K. F. Read38,50, M. Reuter48, K. Reygers33, V. Riabov41,44, Y. Riabov41, G. Roche31, A. Romana28,*, M. Rosati19, S. S. E. Rosendahl32, P. Rosnet31, V. L. Rykov42, S. S. Ryu56, M. E. Sadler1, B. Sahlmueller33, N. Saito27,42,43, T. Sakaguchi8,54, M. Sakai35, S. Sakai52, V. Samsonov41, L. Sanfratello36, R. Santo33, H. D. Sato27,42, S. Sato5,52, S. Sawada23, Y. Schutz49, V. Semenov17, R. Seto6, M. R. Shaw1,30, T. K. Shea5, I. Shein17, T.-A. Shibata42,51, K. Shigaki16,23, T. Shiina30, M. Shimomura52, A. Sickles48, C. L. Silva45, D. Silvermyr30,32, K. S. Sim25, C. P. Singh3, V. Singh3, M. Sivertz5, A. Soldatov17, R. A. Soltz29, W. E. Sondheim30, S. P. Sorensen50, I. V. Sourikova5, F. Staley11, P. W. Stankus38, E. Stenlund32, M. Stepanov37, A. Ster24, S. P. Stoll5, T. Sugitate16, J. P. Sullivan30, S. Takagi52, E. M. Takagui45, A. Taketani42,43, M. Tamai54, K. H. Tanaka23, Y. Tanaka35, K. Tanida42, M. J. Tannenbaum5, A. Taranenko47, P. Tarján12, J. D. Tepe1,30, T. L. Thomas36, M. Togawa27,42, J. Tojo27,42, H. Torii27,42,43, R. S. Towell1, V.-N. Tram28, I. Tserruya55, Y. Tsuchimoto16, H. Tsuruoka52, S. K. Tuli3, H. Tydesjö32, N. Tyurin17, T. J. Uam34, H. W. van Hecke30, J. Velkovska5,48, M. Velkovsky48, V. Veszprémi12, L. Villatte50, A. A. Vinogradov26, M. A. Volkov26, E. Vznuzdaev41, X. R. Wang15, Y. Watanabe42,43, S. N. White5, N. Willis39, F. K. Wohn19, C. L. Woody5, W. Xie6, Y. Yang7, A. Yanovich17, S. Yokkaichi42,43, G. R. Young38, I. E. Yushmanov26, W. A. Zajc10,†, C. Zhang10, S. Zhou7, S. J. Zhou55, J. Zimányi24,*, L. Zolin20, and X. Zong19 (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, NY 10027 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, RU-142281, Russia
18University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
19Iowa State University, Ames, Iowa 50011, USA
20Joint Institute for Nuclear Research, RU-141980 Dubna, Moscow Region, Russia
21KAERI, Cyclotron Application Laboratory, Seoul, South Korea
22Kangnung National University, Kangnung 210-702, South Korea
23KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
24KFKI 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
25Korea University, Seoul, 136-701, Korea
26Russian Research Center “Kurchatov Institute,” Moscow, Russia
27Kyoto University, Kyoto 606-8502, Japan
28Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128, Palaiseau, France
29Lawrence Livermore National Laboratory, Livermore, California 94550, USA
30Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
31LPC, Université Blaise Pascal, CNRS-IN2P3, Clermont-Fd, F-63177 Aubiere Cedex, France
32Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden
33Institut für Kernphysik, University of Muenster, D-48149 Muenster, Germany
34Myongji University, Yongin, Kyonggido 449-728, Korea
35Nagasaki Institute of Applied Science, Nagasaki-shi, Nagasaki 851-0193, Japan
36University of New Mexico, Albuquerque, New Mexico 87131, USA
37New Mexico State University, Las Cruces, New Mexico 88003, USA
38Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
39IPN-Orsay, Universite Paris Sud, CNRS-IN2P3, BP1, F-91406, Orsay, France
40Peking University, Beijing, People's Republic of China
41PNPI, Petersburg Nuclear Physics Institute, Gatchina, Leningrad region, RU-188300, Russia
42RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, JAPAN
43RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
44Saint Petersburg State Polytechnic University, St. Petersburg, Russia
45Universidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo CEP05315-970, Brazil
46System Electronics Laboratory, Seoul National University, Seoul, South Korea
47Chemistry Department, Stony Brook University, Stony Brook, SUNY, New York 11794-3400, USA
48Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USA
49SUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes) BP 20722, F-44307, Nantes, France
50University of Tennessee, Knoxville, Tennesee 37996, USA
51Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152-8551, Japan
52Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
53Vanderbilt University, Nashville, Tennessee 37235, USA
54Waseda University, Advanced Research Institute for Science and Engineering, 17 Kikui-cho, Shinjuku-ku, Tokyo 162-0044, Japan
55Weizmann Institute, Rehovot 76100, Israel
56Yonsei University, IPAP, Seoul 120-749, Korea
Received 6 November 2006; published 27 February 2007
Inclusive transverse momentum spectra of η mesons in the range pT≈2–12 GeV/c have been measured at midrapidity (|η|<0.35) by the PHENIX experiment at RHIC in p+p,d+Au, and Au+Au collisions at √sNN=200 GeV. The η mesons are reconstructed through their η→γ γ channel for the three colliding systems as well as through the η→π0π+π- decay mode in p+p and d+Au collisions. The nuclear modification factor in d+Au collisions, RdAu(pT)≈1.0–1.1, suggests at most only modest pT broadening (“Cronin enhancement”). In central Au+Au reactions, the η yields are significantly suppressed, with RAuAu(pT)≈0.2. The ratio of η to π0 yields is approximately constant as a function of pT for the three colliding systems in agreement with the high-pT world average of Rη/π0≈0.5 in hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions for a wide range of center-of-mass energies (√sNN≈3–1800 GeV) as well as, for high scaled momentum xp, in e+e- annihilations at √s=91.2 GeV. These results are consistent with a scenario where high-pT η production in nuclear collisions at the Relativistic Heavy Ion Collider is largely unaffected by initial-state effects but where light-quark mesons (π0,η) are equally suppressed due to final-state interactions of the parent partons in the dense medium produced in Au+Au reactions.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.75.024909
DOI:
10.1103/PhysRevC.75.024909
PACS:
25.75.-q, 12.38.Mh, 13.85.-t, 13.87.Fh
*Deceased. †Electronic address: zajc@nevis.columbia.edu.
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