APS » Phys. Rev. Lett. » Volume 101 » Issue 16

A. Adare,¹² S. Afanasiev,²⁶ C. Aidala,^13,37 N. N. Ajitanand,⁵⁴ Y. Akiba,^48,49 H. Al-Bataineh,⁴³ J. Alexander,⁵⁴ K. Aoki,^31,48 L. Aphecetche,⁵⁶ R. Armendariz,⁴³ S. H. Aronson,⁷ J. Asai,^48,49 E. T. Atomssa,³² R. Averbeck,⁵⁵ T. C. Awes,⁴⁴ B. Azmoun,⁷ V. Babintsev,²² M. Bai,⁶ G. Baksay,¹⁸ L. Baksay,¹⁸ A. Baldisseri,¹⁵ K. N. Barish,⁸ P. D. Barnes,³⁴ B. Bassalleck,⁴² A. T. Basye,¹ S. Bathe,⁸ S. Batsouli,⁴⁴ V. Baublis,⁴⁷ C. Baumann,³⁸ A. Bazilevsky,⁷ S. Belikov,⁷ R. Bennett,⁵⁵ A. Berdnikov,⁵¹ Y. Berdnikov,⁵¹ A. A. Bickley,¹² J. G. Boissevain,³⁴ H. Borel,¹⁵ K. Boyle,⁵⁵ M. L. Brooks,³⁴ H. Buesching,⁷ V. Bumazhnov,²² G. Bunce,^7,49 S. Butsyk,^34,55 C. M. Camacho,³⁴ S. Campbell,⁵⁵ B. S. Chang,⁶³ W. C. Chang,² J.-L. Charvet,¹⁵ S. Chernichenko,²² J. Chiba,²⁷ C. Y. Chi,¹³ M. Chiu,²³ I. J. Choi,⁶³ R. K. Choudhury,⁴ T. Chujo,^59,60 P. Chung,⁵⁴ A. Churyn,²² V. Cianciolo,⁴⁴ Z. Citron,⁵⁵ C. R. Cleven,²⁰ B. A. Cole,¹³ M. P. Comets,⁴⁵ P. Constantin,³⁴ M. Csanád,¹⁷ T. Csörgő,²⁸ T. Dahms,⁵⁵ S. Dairaku,^31,48 K. Das,¹⁹ G. David,⁷ M. B. Deaton,¹ K. Dehmelt,¹⁸ H. Delagrange,⁵⁶ A. Denisov,²² D. d'Enterria,^13,32 A. Deshpande,^49,55 E. J. Desmond,⁷ O. Dietzsch,⁵² A. Dion,⁵⁵ M. Donadelli,⁵² O. Drapier,³² A. Drees,⁵⁵ K. A. Drees,⁶ A. K. Dubey,⁶² A. Durum,²² D. Dutta,⁴ V. Dzhordzhadze,⁸ Y. V. Efremenko,⁴⁴ J. Egdemir,⁵⁵ F. Ellinghaus,¹² W. S. Emam,⁸ T. Engelmore,¹³ A. Enokizono,³³ H. En'yo,^48,49 S. Esumi,⁵⁹ K. O. Eyser,⁸ B. Fadem,³⁹ D. E. Fields,^42,49 M. Finger, Jr.,^9,26 M. Finger,^9,26 F. Fleuret,³² S. L. Fokin,³⁰ Z. Fraenkel,⁶² J. E. Frantz,⁵⁵ A. Franz,⁷ A. D. Frawley,¹⁹ K. Fujiwara,⁴⁸ Y. Fukao,^31,48 T. Fusayasu,⁴¹ S. Gadrat,³⁵ I. Garishvili,⁵⁷ A. Glenn,¹² H. Gong,⁵⁵ M. Gonin,³² J. Gosset,¹⁵ Y. Goto,^48,49 R. Granier de Cassagnac,³² N. Grau,^13,25 S. V. Greene,⁶⁰ M. Grosse Perdekamp,^23,49 T. Gunji,¹¹ H.-Å. Gustafsson,³⁶ T. Hachiya,²¹ A. Hadj Henni,⁵⁶ C. Haegemann,⁴² J. S. Haggerty,⁷ H. Hamagaki,¹¹ R. Han,⁴⁶ H. Harada,²¹ E. P. Hartouni,³³ K. Haruna,²¹ E. Haslum,³⁶ R. Hayano,¹¹ M. Heffner,³³ T. K. Hemmick,⁵⁵ T. Hester,⁸ X. He,²⁰ H. Hiejima,²³ J. C. Hill,²⁵ R. Hobbs,⁴² M. Hohlmann,¹⁸ W. Holzmann,⁵⁴ K. Homma,²¹ B. Hong,²⁹ T. Horaguchi,^11,48,58 D. Hornback,⁵⁷ S. Huang,⁶⁰ T. Ichihara,^48,49 R. Ichimiya,⁴⁸ Y. Ikeda,⁵⁹ K. Imai,^31,48 J. Imrek,¹⁶ M. Inaba,⁵⁹ Y. Inoue,^50,48 D. Isenhower,¹ L. Isenhower,¹ M. Ishihara,⁴⁸ T. Isobe,¹¹ M. Issah,⁵⁴ A. Isupov,²⁶ D. Ivanischev,⁴⁷ B. V. Jacak,⁵⁵ J. Jia,¹³ J. Jin,¹³ O. Jinnouchi,⁴⁹ B. M. Johnson,⁷ K. S. Joo,⁴⁰ D. Jouan,⁴⁵ F. Kajihara,¹¹ S. Kametani,^11,48,61 N. Kamihara,^48,49 J. Kamin,⁵⁵ M. Kaneta,⁴⁹ J. H. Kang,⁶³ H. Kanou,^48,58 J. Kapustinsky,³⁴ D. Kawall,^37,49 A. V. Kazantsev,³⁰ T. Kempel,²⁵ A. Khanzadeev,⁴⁷ K. M. Kijima,²¹ J. Kikuchi,⁶¹ B. I. Kim,²⁹ D. H. Kim,⁴⁰ D. J. Kim,⁶³ E. Kim,⁵³ S. H. Kim,⁶³ E. Kinney,¹² K. Kiriluk,¹² A. Kiss,¹⁷ E. Kistenev,⁷ A. Kiyomichi,⁴⁸ J. Klay,³³ C. Klein-Boesing,³⁸ L. Kochenda,⁴⁷ V. Kochetkov,²² B. Komkov,⁴⁷ M. Konno,⁵⁹ J. Koster,²³ D. Kotchetkov,⁸ A. Kozlov,⁶² A. Král,¹⁴ A. Kravitz,¹³ J. Kubart,^9,24 G. J. Kunde,³⁴ N. Kurihara,¹¹ K. Kurita,^50,48 M. Kurosawa,⁴⁸ M. J. Kweon,²⁹ Y. Kwon,^57,63 G. S. Kyle,⁴³ R. Lacey,⁵⁴ Y.-S. Lai,¹³ Y. S. Lai,¹³ J. G. Lajoie,²⁵ D. Layton,²³ A. Lebedev,²⁵ D. M. Lee,³⁴ K. B. Lee,²⁹ M. K. Lee,⁶³ T. Lee,⁵³ M. J. Leitch,³⁴ M. A. L. Leite,⁵² B. Lenzi,⁵² P. Liebing,⁴⁹ T. Liška,¹⁴ A. Litvinenko,²⁶ H. Liu,⁴³ M. X. Liu,³⁴ X. Li,¹⁰ B. Love,⁶⁰ D. Lynch,⁷ C. F. Maguire,⁶⁰ Y. I. Makdisi,^6,7 A. Malakhov,²⁶ M. D. Malik,⁴² V. I. Manko,³⁰ E. Mannel,¹³ Y. Mao,^46,48 L. Mašek,^9,24 H. Masui,⁵⁹ F. Matathias,¹³ M. McCumber,⁵⁵ P. L. McGaughey,³⁴ N. Means,⁵⁵ B. Meredith,²³ Y. Miake,⁵⁹ P. Mikeš,^9,24 K. Miki,⁵⁹ T. E. Miller,⁶⁰ A. Milov,^7,55 S. Mioduszewski,⁷ M. Mishra,³ J. T. Mitchell,⁷ M. Mitrovski,⁵⁴ A. K. Mohanty,⁴ Y. Morino,¹¹ A. Morreale,⁸ D. P. Morrison,⁷ T. V. Moukhanova,³⁰ D. Mukhopadhyay,⁶⁰ J. Murata,^50,48 S. Nagamiya,²⁷ Y. Nagata,⁵⁹ J. L. Nagle,¹² M. Naglis,⁶² M. I. Nagy,¹⁷ I. Nakagawa,^48,49 Y. Nakamiya,²¹ T. Nakamura,²¹ K. Nakano,^48,58 J. Newby,³³ M. Nguyen,⁵⁵ T. Niita,⁵⁹ B. E. Norman,³⁴ R. Nouicer,⁵ A. S. Nyanin,³⁰ E. O'Brien,⁷ S. X. Oda,¹¹ C. A. Ogilvie,²⁵ H. Ohnishi,⁴⁸ H. Okada,^31,48 K. Okada,⁴⁹ M. Oka,⁵⁹ O. O. Omiwade,¹ Y. Onuki,⁴⁸ A. Oskarsson,³⁶ M. Ouchida,²¹ K. Ozawa,¹¹ R. Pak,^5,7 D. Pal,⁶⁰ A. P. T. Palounek,³⁴ V. Pantuev,⁵⁵ V. Papavassiliou,⁴³ J. Park,⁵³ W. J. Park,²⁹ S. F. Pate,⁴³ H. Pei,²⁵ J.-C. Peng,²³ H. Pereira,¹⁵ V. Peresedov,²⁶ D. Yu. Peressounko,³⁰ C. Pinkenburg,⁷ M. L. Purschke,⁷ A. K. Purwar,³⁴ H. Qu,²⁰ J. Rak,⁴² A. Rakotozafindrabe,³² I. Ravinovich,⁶² K. F. Read,^44,57 S. Rembeczki,¹⁸ M. Reuter,⁵⁵ K. Reygers,³⁸ V. Riabov,⁴⁷ Y. Riabov,⁴⁷ D. Roach,⁶⁰ G. Roche,³⁵ S. D. Rolnick,⁸ A. Romana,³² M. Rosati,²⁵ S. S. E. Rosendahl,³⁶ P. Rosnet,³⁵ P. Rukoyatkin,²⁶ P. Ružička,²⁴ V. L. Rykov,⁴⁸ B. Sahlmueller,³⁸ N. Saito,^31,48,49 T. Sakaguchi,⁷ S. Sakai,⁵⁹ K. Sakashita,^48,58 H. Sakata,²¹ V. Samsonov,⁴⁷ S. Sato,²⁷ T. Sato,⁵⁹ S. Sawada,²⁷ K. Sedgwick,⁸ J. Seele,¹² R. Seidl,²³ A. Yu. Semenov,²⁵ V. Semenov,²² R. Seto,⁸ D. Sharma,⁶² I. Shein,²² A. Shevel,^47,54 T.-A. Shibata,^48,58 K. Shigaki,²¹ M. Shimomura,⁵⁹ K. Shoji,^31,48 P. Shukla,⁴ A. Sickles,^7,55 C. L. Silva,⁵² D. Silvermyr,⁴⁴ C. Silvestre,¹⁵ K. S. Sim,²⁹ B. K. Singh,³ C. P. Singh,³ V. Singh,³ S. Skutnik,²⁵ M. Slunečka,^9,26 A. Soldatov,²² R. A. Soltz,³³ W. E. Sondheim,³⁴ S. P. Sorensen,⁵⁷ I. V. Sourikova,⁷ F. Staley,¹⁵ P. W. Stankus,⁴⁴ E. Stenlund,³⁶ M. Stepanov,⁴³ A. Ster,²⁸ S. P. Stoll,⁷ T. Sugitate,²¹ C. Suire,⁴⁵ A. Sukhanov,⁵ J. Sziklai,²⁸ T. Tabaru,⁴⁹ S. Takagi,⁵⁹ E. M. Takagui,⁵² A. Taketani,^48,49 R. Tanabe,⁵⁹ Y. Tanaka,⁴¹ K. Tanida,^48,49 M. J. Tannenbaum,⁷ A. Taranenko,⁵⁴ P. Tarján,¹⁶ H. Themann,⁵⁵ T. L. Thomas,⁴² M. Togawa,^31,48 A. Toia,⁵⁵ J. Tojo,⁴⁸ L. Tomášek,²⁴ Y. Tomita,⁵⁹ H. Torii,^21,48 R. S. Towell,¹ V-N. Tram,³² I. Tserruya,⁶² Y. Tsuchimoto,²¹ C. Vale,²⁵ H. Valle,⁶⁰ H. W. vanHecke,³⁴ A. Veicht,²³ J. Velkovska,⁶⁰ R. Vertesi,¹⁶ A. A. Vinogradov,³⁰ M. Virius,¹⁴ V. Vrba,²⁴ E. Vznuzdaev,⁴⁷ M. Wagner,^31,48 D. Walker,⁵⁵ X. R. Wang,⁴³ Y. Watanabe,^48,49 F. Wei,²⁵ J. Wessels,³⁸ S. N. White,⁷ D. Winter,¹³ C. L. Woody,⁷ M. Wysocki,¹² W. Xie,⁴⁹ Y. L. Yamaguchi,⁶¹ K. Yamaura,²¹ R. Yang,²³ A. Yanovich,²² Z. Yasin,⁸ J. Ying,²⁰ S. Yokkaichi,^48,49 G. R. Young,⁴⁴ I. Younus,⁴² I. E. Yushmanov,³⁰ W. A. Zajc,¹³ O. Zaudtke,³⁸ C. Zhang,⁴⁴ S. Zhou,¹⁰ J. Zimányi,²⁸ and L. Zolin²⁶

(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
⁵Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
⁶Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
⁷Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
⁸University of California–Riverside, Riverside, California 92521, USA
⁹Charles University, Ovocný trh 5, Praha 1, 116 36, Prague, Czech Republic
¹⁰China Institute of Atomic Energy (CIAE), Beijing, People's Republic of China
¹¹Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
¹²University of Colorado, Boulder, Colorado 80309, USA
¹³Columbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USA
¹⁴Czech Technical University, Zikova 4, 166 36 Prague 6, Czech Republic
¹⁵Dapnia, CEA Saclay, F-91191, Gif-sur-Yvette, France
¹⁶Debrecen University, H-4010 Debrecen, Egyetem tér 1, Hungary
¹⁷ELTE, Eötvös Loránd University, H-1117 Budapest, Pázmány P. s. 1/A, Hungary
¹⁸Florida Institute of Technology, Melbourne, Florida 32901, USA
¹⁹Florida State University, Tallahassee, Florida 32306, USA
²⁰Georgia State University, Atlanta, Georgia 30303, USA
²¹Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
²²IHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, 142281, Russia
²³University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
²⁴Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic
²⁵Iowa State University, Ames, Iowa 50011, USA
²⁶Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
²⁷KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
²⁸KFKI Research Institute for Particle and Nuclear Physics of the Hungarian Academy of Sciences (MTA KFKI RMKI), H-1525 Budapest 114, PO Box 49, Budapest, Hungary
²⁹Korea University, Seoul, 136-701, Korea
³⁰Russian Research Center “Kurchatov Institute,” Moscow, Russia
³¹Kyoto University, Kyoto 606-8502, Japan
³²Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128, Palaiseau, France
³³Lawrence Livermore National Laboratory, Livermore, California 94550, USA
³⁴Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
³⁵LPC, Université Blaise Pascal, CNRS-IN2P3, Clermont-Fd, 63177 Aubiere Cedex, France
³⁶Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden
³⁷Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337, USA
³⁸Institut für Kernphysik, University of Muenster, D-48149 Muenster, Germany
³⁹Muhlenberg College, Allentown, Pennsylvania 18104-5586, USA
⁴⁰Myongji University, Yongin, Kyonggido 449-728, Korea
⁴¹Nagasaki Institute of Applied Science, Nagasaki-shi, Nagasaki 851-0193, Japan
⁴²University of New Mexico, Albuquerque, New Mexico 87131, USA
⁴³New Mexico State University, Las Cruces, New Mexico 88003, USA
⁴⁴Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
⁴⁵IPN-Orsay, Universite Paris Sud, CNRS-IN2P3, BP1, F-91406, Orsay, France
⁴⁶Peking University, Beijing, People's Republic of China
⁴⁷PNPI, Petersburg Nuclear Physics Institute, Gatchina, Leningrad region, 188300, Russia
⁴⁸RIKEN, The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan
⁴⁹RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
⁵⁰Physics Department, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
⁵¹Saint Petersburg State Polytechnic University, St. Petersburg, Russia
⁵²Universidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo CEP05315-970, Brazil
⁵³System Electronics Laboratory, Seoul National University, Seoul, Korea
⁵⁴Chemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USA
⁵⁵Department of Physics and Astronomy, Stony Brook University, SUNY , Stony Brook, New York 11794, USA
⁵⁶SUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes) BP 20722 - 44307, Nantes, France
⁵⁷University of Tennessee, Knoxville, Tennessee 37996, USA
⁵⁸Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152-8551, Japan
⁵⁹Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
⁶⁰Vanderbilt University, Nashville, Tennessee 37235, USA
⁶¹Waseda University, Advanced Research Institute for Science and Engineering, 17 Kikui-cho, Shinjuku-ku, Tokyo 162-0044, Japan
⁶²Weizmann Institute, Rehovot 76100, Israel
⁶³Yonsei University, IPAP, Seoul 120-749, Korea

Neutral pion transverse momentum (p_T) spectra at midrapidity (|y|0.35) were measured in Cu+Cu collisions at =22.4, 62.4, and 200 GeV. Relative to ⁰ yields in p+p collisions scaled by the number of inelastic nucleon-nucleon collisions (N_coll) the ⁰ yields for p_T2 GeV/c in central Cu+Cu collisions are suppressed at 62.4 and 200 GeV whereas an enhancement is observed at 22.4 GeV. A comparison with a jet-quenching model suggests that final state parton energy loss dominates in central Cu+Cu collisions at 62.4 and 200 GeV, while the enhancement at 22.4 GeV is consistent with nuclear modifications in the initial state alone.

©2008 The American Physical Society

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