APS » Phys. Rev. Lett. » Volume 101 » Issue 12

A. Adare,⁸ S. Afanasiev,²² C. Aidala,⁹ N. N. Ajitanand,⁴⁸ Y. Akiba,^42,43 H. Al-Bataineh,³⁷ J. Alexander,⁴⁸ K. Aoki,^27,42 L. Aphecetche,⁵⁰ R. Armendariz,³⁷ S. H. Aronson,³ J. Asai,⁴³ E. T. Atomssa,²⁸ R. Averbeck,⁴⁹ T. C. Awes,³⁸ B. Azmoun,³ V. Babintsev,¹⁸ G. Baksay,¹⁴ L. Baksay,¹⁴ A. Baldisseri,¹¹ K. N. Barish,⁴ P. D. Barnes,³⁰ B. Bassalleck,³⁶ S. Bathe,⁴ S. Batsouli,³⁸ V. Baublis,⁴¹ A. Bazilevsky,³ S. Belikov,³ R. Bennett,⁴⁹ Y. Berdnikov,⁴⁵ A. A. Bickley,⁸ J. G. Boissevain,³⁰ H. Borel,¹¹ K. Boyle,⁴⁹ M. L. Brooks,³⁰ H. Buesching,³ V. Bumazhnov,¹⁸ G. Bunce,^3,43 S. Butsyk,^30,49 S. Campbell,⁴⁹ B. S. Chang,⁵⁷ J.-L. Charvet,¹¹ S. Chernichenko,¹⁸ J. Chiba,²³ C. Y. Chi,⁹ M. Chiu,¹⁹ I. J. Choi,⁵⁷ T. Chujo,⁵⁴ P. Chung,⁴⁸ A. Churyn,¹⁸ V. Cianciolo,³⁸ C. R. Cleven,¹⁶ B. A. Cole,⁹ M. P. Comets,³⁹ P. Constantin,³⁰ M. Csanád,¹³ T. Csörgő,²⁴ T. Dahms,⁴⁹ K. Das,¹⁵ G. David,³ M. B. Deaton,¹ K. Dehmelt,¹⁴ H. Delagrange,⁵⁰ A. Denisov,¹⁸ D. d'Enterria,⁹ A. Deshpande,^43,49 E. J. Desmond,³ O. Dietzsch,⁴⁶ A. Dion,⁴⁹ M. Donadelli,⁴⁶ O. Drapier,²⁸ A. Drees,⁴⁹ A. K. Dubey,⁵⁶ A. Durum,¹⁸ V. Dzhordzhadze,⁴ Y. V. Efremenko,³⁸ J. Egdemir,⁴⁹ F. Ellinghaus,⁸ W. S. Emam,⁴ A. Enokizono,²⁹ H. En'yo,^42,43 S. Esumi,⁵³ K. O. Eyser,⁴ D. E. Fields,^36,43 M. Finger,^5,22 M. Finger, Jr.,^5,22 F. Fleuret,²⁸ S. L. Fokin,²⁶ Z. Fraenkel,⁵⁶ J. E. Frantz,⁴⁹ A. Franz,³ A. D. Frawley,¹⁵ K. Fujiwara,⁴² Y. Fukao,^27,42 T. Fusayasu,³⁵ S. Gadrat,³¹ I. Garishvili,⁵¹ A. Glenn,⁸ H. Gong,⁴⁹ M. Gonin,²⁸ J. Gosset,¹¹ Y. Goto,^42,43 R. Granier de Cassagnac,²⁸ N. Grau,²¹ S. V. Greene,⁵⁴ M. Grosse Perdekamp,^19,43 T. Gunji,⁷ H.-Å. Gustafsson,³² T. Hachiya,¹⁷ A. Hadj Henni,⁵⁰ C. Haegemann,³⁶ J. S. Haggerty,³ H. Hamagaki,⁷ R. Han,⁴⁰ H. Harada,¹⁷ E. P. Hartouni,²⁹ K. Haruna,¹⁷ E. Haslum,³² R. Hayano,⁷ M. Heffner,²⁹ T. K. Hemmick,⁴⁹ T. Hester,⁴ X. He,¹⁶ H. Hiejima,¹⁹ J. C. Hill,²¹ R. Hobbs,³⁶ M. Hohlmann,¹⁴ W. Holzmann,⁴⁸ K. Homma,¹⁷ B. Hong,²⁵ T. Horaguchi,^42,52 D. Hornback,⁵¹ T. Ichihara,^42,43 K. Imai,^27,42 M. Inaba,⁵³ Y. Inoue,^44,42 D. Isenhower,¹ L. Isenhower,¹ M. Ishihara,⁴² T. Isobe,⁷ M. Issah,⁴⁸ A. Isupov,²² B. V. Jacak,⁴⁹ J. Jia,⁹ J. Jin,⁹ O. Jinnouchi,⁴³ B. M. Johnson,³ K. S. Joo,³⁴ D. Jouan,³⁹ F. Kajihara,⁷ S. Kametani,^7,55 N. Kamihara,⁴² J. Kamin,⁴⁹ M. Kaneta,⁴³ J. H. Kang,⁵⁷ H. Kanou,^42,52 D. Kawall,⁴³ A. V. Kazantsev,²⁶ A. Khanzadeev,⁴¹ J. Kikuchi,⁵⁵ D. H. Kim,³⁴ D. J. Kim,⁵⁷ E. Kim,⁴⁷ E. Kinney,⁸ A. Kiss,¹³ E. Kistenev,³ A. Kiyomichi,⁴² J. Klay,²⁹ C. Klein-Boesing,³³ L. Kochenda,⁴¹ V. Kochetkov,¹⁸ B. Komkov,⁴¹ M. Konno,⁵³ D. Kotchetkov,⁴ A. Kozlov,⁵⁶ A. Král,¹⁰ A. Kravitz,⁹ J. Kubart,^5,20 G. J. Kunde,³⁰ N. Kurihara,⁷ K. Kurita,^44,42 M. J. Kweon,²⁵ Y. Kwon,^51,57 G. S. Kyle,³⁷ R. Lacey,⁴⁸ Y.-S. Lai,⁹ J. G. Lajoie,²¹ A. Lebedev,²¹ D. M. Lee,³⁰ M. K. Lee,⁵⁷ T. Lee,⁴⁷ M. J. Leitch,³⁰ M. A. L. Leite,⁴⁶ B. Lenzi,⁴⁶ T. Liška,¹⁰ A. Litvinenko,²² M. X. Liu,³⁰ X. Li,⁶ B. Love,⁵⁴ D. Lynch,³ C. F. Maguire,⁵⁴ Y. I. Makdisi,³ A. Malakhov,²² M. D. Malik,³⁶ V. I. Manko,²⁶ Y. Mao,^40,42 L. Mašek,^5,20 H. Masui,⁵³ F. Matathias,⁹ M. McCumber,⁴⁹ P. L. McGaughey,³⁰ Y. Miake,⁵³ P. Mikeš,^5,20 K. Miki,⁵³ T. E. Miller,⁵⁴ A. Milov,⁴⁹ S. Mioduszewski,³ M. Mishra,² J. T. Mitchell,³ M. Mitrovski,⁴⁸ A. Morreale,⁴ D. P. Morrison,³ T. V. Moukhanova,²⁶ D. Mukhopadhyay,⁵⁴ J. Murata,^44,42 S. Nagamiya,²³ Y. Nagata,⁵³ J. L. Nagle,⁸ M. Naglis,⁵⁶ I. Nakagawa,^42,43 Y. Nakamiya,¹⁷ T. Nakamura,¹⁷ K. Nakano,^42,52 J. Newby,²⁹ M. Nguyen,⁴⁹ B. E. Norman,³⁰ A. S. Nyanin,²⁶ E. O'Brien,³ S. X. Oda,⁷ C. A. Ogilvie,²¹ H. Ohnishi,⁴² H. Okada,^27,42 K. Okada,⁴³ M. Oka,⁵³ O. O. Omiwade,¹ A. Oskarsson,³² M. Ouchida,¹⁷ K. Ozawa,⁷ R. Pak,³ D. Pal,⁵⁴ A. P. T. Palounek,³⁰ V. Pantuev,⁴⁹ V. Papavassiliou,³⁷ J. Park,⁴⁷ W. J. Park,²⁵ S. F. Pate,³⁷ H. Pei,²¹ J.-C. Peng,¹⁹ H. Pereira,¹¹ V. Peresedov,²² D. Yu. Peressounko,²⁶ C. Pinkenburg,³ M. L. Purschke,³ A. K. Purwar,³⁰ H. Qu,¹⁶ J. Rak,³⁶ A. Rakotozafindrabe,²⁸ I. Ravinovich,⁵⁶ K. F. Read,^38,51 S. Rembeczki,¹⁴ M. Reuter,⁴⁹ K. Reygers,³³ V. Riabov,⁴¹ Y. Riabov,⁴¹ G. Roche,³¹ A. Romana,²⁸ M. Rosati,²¹ S. S. E. Rosendahl,³² P. Rosnet,³¹ P. Rukoyatkin,²² V. L. Rykov,⁴² B. Sahlmueller,³³ N. Saito,^27,42,43 T. Sakaguchi,³ S. Sakai,⁵³ H. Sakata,¹⁷ V. Samsonov,⁴¹ S. Sato,²³ S. Sawada,²³ J. Seele,⁸ R. Seidl,¹⁹ V. Semenov,¹⁸ R. Seto,⁴ D. Sharma,⁵⁶ I. Shein,¹⁸ A. Shevel,^41,48 T.-A. Shibata,^42,52 K. Shigaki,¹⁷ M. Shimomura,⁵³ K. Shoji,^27,42 A. Sickles,⁴⁹ C. L. Silva,⁴⁶ D. Silvermyr,³⁸ C. Silvestre,¹¹ K. S. Sim,²⁵ C. P. Singh,² V. Singh,² S. Skutnik,²¹ M. Slunečka,^5,22 A. Soldatov,¹⁸ R. A. Soltz,²⁹ W. E. Sondheim,³⁰ S. P. Sorensen,⁵¹ I. V. Sourikova,³ F. Staley,¹¹ P. W. Stankus,³⁸ E. Stenlund,³² M. Stepanov,³⁷ A. Ster,²⁴ S. P. Stoll,³ T. Sugitate,¹⁷ C. Suire,³⁹ J. Sziklai,²⁴ T. Tabaru,⁴³ S. Takagi,⁵³ E. M. Takagui,⁴⁶ A. Taketani,^42,43 Y. Tanaka,³⁵ K. Tanida,^42,43 M. J. Tannenbaum,³ A. Taranenko,⁴⁸ P. Tarján,¹² T. L. Thomas,³⁶ M. Togawa,^27,42 A. Toia,⁴⁹ J. Tojo,⁴² L. Tomášek,²⁰ H. Torii,⁴² R. S. Towell,¹ V-N. Tram,²⁸ I. Tserruya,⁵⁶ Y. Tsuchimoto,¹⁷ C. Vale,²¹ H. Valle,⁵⁴ H. W. van Hecke,³⁰ J. Velkovska,⁵⁴ R. Vertesi,¹² A. A. Vinogradov,²⁶ M. Virius,¹⁰ V. Vrba,²⁰ E. Vznuzdaev,⁴¹ M. Wagner,^27,42 D. Walker,⁴⁹ X. R. Wang,³⁷ Y. Watanabe,^42,43 J. Wessels,³³ S. N. White,³ D. Winter,⁹ C. L. Woody,³ M. Wysocki,⁸ W. Xie,⁴³ Y. L. Yamaguchi,⁵⁵ A. Yanovich,¹⁸ Z. Yasin,⁴ J. Ying,¹⁶ S. Yokkaichi,^42,43 G. R. Young,³⁸ I. Younus,³⁶ I. E. Yushmanov,²⁶ W. A. Zajc,⁹ O. Zaudtke,³³ C. Zhang,³⁸ S. Zhou,⁶ J. Zimányi,²⁴ and L. Zolin²²

(PHENIX Collaboration)

¹Abilene Christian University, Abilene, Texas 79699, USA
²Department of Physics, Banaras Hindu University, Varanasi 221005, India
³Brookhaven National Laboratory, Upton, New York 11973-5000, USA
⁴University of California-Riverside, Riverside, California 92521, USA
⁵Charles University, Ovocný trh 5, Praha 1, 116 36, Prague, Czech Republic
⁶China Institute of Atomic Energy (CIAE), Beijing, People's Republic of China
⁷Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
⁸University of Colorado, Boulder, Colorado 80309, USA
⁹Columbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USA
¹⁰Czech Technical University, Zikova 4, 166 36 Prague 6, Czech Republic
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 Institute of Technology, Melbourne, Florida 32901, USA
¹⁵Florida State University, Tallahassee, Florida 32306, USA
¹⁶Georgia State University, Atlanta, Georgia 30303, USA
¹⁷Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
¹⁸IHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, 142281, Russia
¹⁹University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
²⁰Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic
²¹Iowa State University, Ames, Iowa 50011, USA
²²Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
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, POBox 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, 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, 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
⁴⁴Physics Department, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
⁴⁵Saint Petersburg State Polytechnic University, St. Petersburg, Russia
⁴⁶Universidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo CEP05315-970, Brazil
⁴⁷System Electronics Laboratory, Seoul National University, Seoul, Korea
⁴⁸Chemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USA
⁴⁹Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USA
⁵⁰SUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes) BP 20722-44307, Nantes, France
⁵¹University of Tennessee, Knoxville, Tennessee 37996, USA
⁵²Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152-8551, Japan
⁵³Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
⁵⁴Vanderbilt University, Nashville, Tennessee 37235, USA
⁵⁵Waseda University, Advanced Research Institute for Science and Engineering, 17 Kikui-cho, Shinjuku-ku, Tokyo 162-0044, Japan
⁵⁶Weizmann Institute, Rehovot 76100, Israel
⁵⁷Yonsei University, IPAP, Seoul 120-749, Korea

Yields for J/ production in Cu+Cu collisions at =200 GeV have been measured over the rapidity range |y|<2.2 and compared with results in p+p and Au+Au collisions at the same energy. The Cu+Cu data offer greatly improved precision over existing Au+Au data for J/ production in collisions with small to intermediate numbers of participants, in the range where the quark-gluon plasma transition threshold is predicted to lie. Cold nuclear matter estimates based on ad hoc fits to d+Au data describe the Cu+Cu data up to N_part~50, corresponding to a Bjorken energy density of at least 1.5 GeV/fm³.

©2008 The American Physical Society

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