APS » Phys. Rev. Lett. » Volume 103 » Issue 8

A. Adare,¹¹ S. Afanasiev,²⁵ C. Aidala,^12,36 N. N. Ajitanand,⁵³ Y. Akiba,^47,48 H. Al-Bataineh,⁴² J. Alexander,⁵³ K. Aoki,^30,47 L. Aphecetche,⁵⁵ R. Armendariz,⁴² S. H. Aronson,⁶ J. Asai,^47,48 E. T. Atomssa,³¹ R. Averbeck,⁵⁴ T. C. Awes,⁴³ B. Azmoun,⁶ V. Babintsev,²¹ M. Bai,⁵ G. Baksay,¹⁷ L. Baksay,¹⁷ A. Baldisseri,¹⁴ K. N. Barish,⁷ P. D. Barnes,³³ B. Bassalleck,⁴¹ A. T. Basye,¹ S. Bathe,⁷ S. Batsouli,⁴³ V. Baublis,⁴⁶ C. Baumann,³⁷ A. Bazilevsky,⁶ S. Belikov,⁶ R. Bennett,⁵⁴ A. Berdnikov,⁵⁰ Y. Berdnikov,⁵⁰ A. A. Bickley,¹¹ J. G. Boissevain,³³ H. Borel,¹⁴ K. Boyle,⁵⁴ M. L. Brooks,³³ H. Buesching,⁶ V. Bumazhnov,²¹ G. Bunce,^6,48 S. Butsyk,^33,54 C. M. Camacho,³³ S. Campbell,⁵⁴ B. S. Chang,⁶² W. C. Chang,² J.-L. Charvet,¹⁴ S. Chernichenko,²¹ J. Chiba,²⁶ C. Y. Chi,¹² M. Chiu,²² I. J. Choi,⁶² R. K. Choudhury,⁴ T. Chujo,^58,59 P. Chung,⁵³ A. Churyn,²¹ V. Cianciolo,⁴³ Z. Citron,⁵⁴ C. R. Cleven,¹⁹ B. A. Cole,¹² M. P. Comets,⁴⁴ P. Constantin,³³ M. Csanád,¹⁶ T. Csörgő,²⁷ T. Dahms,⁵⁴ S. Dairaku,^30,47 K. Das,¹⁸ G. David,⁶ M. B. Deaton,¹ K. Dehmelt,¹⁷ H. Delagrange,⁵⁵ A. Denisov,²¹ D. d'Enterria,^12,31 A. Deshpande,^48,54 E. J. Desmond,⁶ O. Dietzsch,⁵¹ A. Dion,⁵⁴ M. Donadelli,⁵¹ O. Drapier,³¹ A. Drees,⁵⁴ K. A. Drees,⁵ A. K. Dubey,⁶¹ A. Durum,²¹ D. Dutta,⁴ V. Dzhordzhadze,⁷ Y. V. Efremenko,⁴³ J. Egdemir,⁵⁴ F. Ellinghaus,¹¹ W. S. Emam,⁷ T. Engelmore,¹² A. Enokizono,³² H. En'yo,^47,48 S. Esumi,⁵⁸ K. O. Eyser,⁷ B. Fadem,³⁸ D. E. Fields,^41,48 M. Finger, Jr.,^8,25 M. Finger,^8,25 F. Fleuret,³¹ S. L. Fokin,²⁹ Z. Fraenkel,⁶¹ J. E. Frantz,⁵⁴ A. Franz,⁶ A. D. Frawley,¹⁸ K. Fujiwara,⁴⁷ Y. Fukao,^30,47 T. Fusayasu,⁴⁰ S. Gadrat,³⁴ I. Garishvili,⁵⁶ A. Glenn,¹¹ H. Gong,⁵⁴ M. Gonin,³¹ J. Gosset,¹⁴ Y. Goto,^47,48 R. Granier de Cassagnac,³¹ N. Grau,^12,24 S. V. Greene,⁵⁹ M. Grosse Perdekamp,^22,48 T. Gunji,¹⁰ H.-Å. Gustafsson,³⁵ T. Hachiya,²⁰ A. Hadj Henni,⁵⁵ C. Haegemann,⁴¹ J. S. Haggerty,⁶ H. Hamagaki,¹⁰ R. Han,⁴⁵ H. Harada,²⁰ E. P. Hartouni,³² K. Haruna,²⁰ E. Haslum,³⁵ R. Hayano,¹⁰ M. Heffner,³² T. K. Hemmick,⁵⁴ T. Hester,⁷ X. He,¹⁹ H. Hiejima,²² J. C. Hill,²⁴ R. Hobbs,⁴¹ M. Hohlmann,¹⁷ W. Holzmann,⁵³ K. Homma,²⁰ B. Hong,²⁸ T. Horaguchi,^10,47,57 D. Hornback,⁵⁶ S. Huang,⁵⁹ T. Ichihara,^47,48 R. Ichimiya,⁴⁷ Y. Ikeda,⁵⁸ K. Imai,^30,47 J. Imrek,¹⁵ M. Inaba,⁵⁸ Y. Inoue,^49,47 D. Isenhower,¹ L. Isenhower,¹ M. Ishihara,⁴⁷ T. Isobe,¹⁰ M. Issah,⁵³ A. Isupov,²⁵ D. Ivanischev,⁴⁶ B. V. Jacak,⁵⁴ J. Jia,¹² J. Jin,¹² O. Jinnouchi,⁴⁸ B. M. Johnson,⁶ K. S. Joo,³⁹ D. Jouan,⁴⁴ F. Kajihara,¹⁰ S. Kametani,^10,47,60 N. Kamihara,^47,48 J. Kamin,⁵⁴ M. Kaneta,⁴⁸ J. H. Kang,⁶² H. Kanou,^47,57 J. Kapustinsky,³³ D. Kawall,^36,48 A. V. Kazantsev,²⁹ T. Kempel,²⁴ A. Khanzadeev,⁴⁶ K. M. Kijima,²⁰ J. Kikuchi,⁶⁰ B. I. Kim,²⁸ D. H. Kim,³⁹ D. J. Kim,⁶² E. Kim,⁵² S. H. Kim,⁶² E. Kinney,¹¹ K. Kiriluk,¹¹ A. Kiss,¹⁶ E. Kistenev,⁶ A. Kiyomichi,⁴⁷ J. Klay,³² C. Klein-Boesing,³⁷ L. Kochenda,⁴⁶ V. Kochetkov,²¹ B. Komkov,⁴⁶ M. Konno,⁵⁸ J. Koster,²² D. Kotchetkov,⁷ A. Kozlov,⁶¹ A. Král,¹³ A. Kravitz,¹² J. Kubart,^8,23 G. J. Kunde,³³ N. Kurihara,¹⁰ K. Kurita,^49,47 M. Kurosawa,⁴⁷ M. J. Kweon,²⁸ Y. Kwon,^56,62 G. S. Kyle,⁴² R. Lacey,⁵³ Y.-S. Lai,¹² Y. S. Lai,¹² J. G. Lajoie,²⁴ D. Layton,²² A. Lebedev,²⁴ D. M. Lee,³³ K. B. Lee,²⁸ M. K. Lee,⁶² T. Lee,⁵² M. J. Leitch,³³ M. A. L. Leite,⁵¹ B. Lenzi,⁵¹ P. Liebing,⁴⁸ T. Liška,¹³ A. Litvinenko,²⁵ H. Liu,⁴² M. X. Liu,³³ X. Li,⁹ B. Love,⁵⁹ D. Lynch,⁶ C. F. Maguire,⁵⁹ Y. I. Makdisi,⁵ A. Malakhov,²⁵ M. D. Malik,⁴¹ V. I. Manko,²⁹ E. Mannel,¹² Y. Mao,^45,47 L. Mašek,^8,23 H. Masui,⁵⁸ F. Matathias,¹² M. McCumber,⁵⁴ P. L. McGaughey,³³ N. Means,⁵⁴ B. Meredith,²² Y. Miake,⁵⁸ P. Mikeš,^8,23 K. Miki,⁵⁸ T. E. Miller,⁵⁹ A. Milov,^6,54 S. Mioduszewski,⁶ M. Mishra,³ J. T. Mitchell,⁶ M. Mitrovski,⁵³ A. K. Mohanty,⁴ Y. Morino,¹⁰ A. Morreale,⁷ D. P. Morrison,⁶ T. V. Moukhanova,²⁹ D. Mukhopadhyay,⁵⁹ J. Murata,^49,47 S. Nagamiya,²⁶ Y. Nagata,⁵⁸ J. L. Nagle,¹¹ M. Naglis,⁶¹ M. I. Nagy,¹⁶ I. Nakagawa,^47,48 Y. Nakamiya,²⁰ T. Nakamura,²⁰ K. Nakano,^47,57 J. Newby,³² M. Nguyen,⁵⁴ T. Niita,⁵⁸ B. E. Norman,³³ R. Nouicer,⁶ A. S. Nyanin,²⁹ E. O'Brien,⁶ S. X. Oda,¹⁰ C. A. Ogilvie,²⁴ H. Ohnishi,⁴⁷ H. Okada,^30,47 K. Okada,⁴⁸ M. Oka,⁵⁸ O. O. Omiwade,¹ Y. Onuki,⁴⁷ A. Oskarsson,³⁵ M. Ouchida,²⁰ K. Ozawa,¹⁰ R. Pak,⁶ D. Pal,⁵⁹ A. P. T. Palounek,³³ V. Pantuev,⁵⁴ V. Papavassiliou,⁴² J. Park,⁵² W. J. Park,²⁸ S. F. Pate,⁴² H. Pei,²⁴ J.-C. Peng,²² H. Pereira,¹⁴ V. Peresedov,²⁵ D. Yu. Peressounko,²⁹ C. Pinkenburg,⁶ M. L. Purschke,⁶ A. K. Purwar,³³ H. Qu,¹⁹ J. Rak,⁴¹ A. Rakotozafindrabe,³¹ I. Ravinovich,⁶¹ K. F. Read,^43,56 S. Rembeczki,¹⁷ M. Reuter,⁵⁴ K. Reygers,³⁷ V. Riabov,⁴⁶ Y. Riabov,⁴⁶ D. Roach,⁵⁹ G. Roche,³⁴ S. D. Rolnick,⁷ A. Romana,³¹ M. Rosati,²⁴ S. S. E. Rosendahl,³⁵ P. Rosnet,³⁴ P. Rukoyatkin,²⁵ P. Ružička,²³ V. L. Rykov,⁴⁷ B. Sahlmueller,³⁷ N. Saito,^30,47,48 T. Sakaguchi,⁶ S. Sakai,⁵⁸ K. Sakashita,^47,57 H. Sakata,²⁰ V. Samsonov,⁴⁶ S. Sato,²⁶ T. Sato,⁵⁸ S. Sawada,²⁶ K. Sedgwick,⁷ J. Seele,¹¹ R. Seidl,²² A. Yu. Semenov,²⁴ V. Semenov,²¹ R. Seto,⁷ D. Sharma,⁶¹ I. Shein,²¹ A. Shevel,^46,53 T.-A. Shibata,^47,57 K. Shigaki,²⁰ M. Shimomura,⁵⁸ K. Shoji,^30,47 P. Shukla,⁴ A. Sickles,^6,54 C. L. Silva,⁵¹ D. Silvermyr,⁴³ C. Silvestre,¹⁴ K. S. Sim,²⁸ B. K. Singh,³ C. P. Singh,³ V. Singh,³ S. Skutnik,²⁴ M. Slunečka,^8,25 A. Soldatov,²¹ R. A. Soltz,³² W. E. Sondheim,³³ S. P. Sorensen,⁵⁶ I. V. Sourikova,⁶ F. Staley,¹⁴ P. W. Stankus,⁴³ E. Stenlund,³⁵ M. Stepanov,⁴² A. Ster,²⁷ S. P. Stoll,⁶ T. Sugitate,²⁰ C. Suire,⁴⁴ A. Sukhanov,⁶ J. Sziklai,²⁷ T. Tabaru,⁴⁸ S. Takagi,⁵⁸ E. M. Takagui,⁵¹ A. Taketani,^47,48 R. Tanabe,⁵⁸ Y. Tanaka,⁴⁰ K. Tanida,^47,48 M. J. Tannenbaum,⁶ A. Taranenko,⁵³ P. Tarján,¹⁵ H. Themann,⁵⁴ T. L. Thomas,⁴¹ M. Togawa,^30,47 A. Toia,⁵⁴ J. Tojo,⁴⁷ L. Tomášek,²³ Y. Tomita,⁵⁸ H. Torii,^20,47 R. S. Towell,¹ V-N. Tram,³¹ I. Tserruya,⁶¹ Y. Tsuchimoto,²⁰ C. Vale,²⁴ H. Valle,⁵⁹ H. W. van Hecke,³³ A. Veicht,²² J. Velkovska,⁵⁹ R. Vertesi,¹⁵ A. A. Vinogradov,²⁹ M. Virius,¹³ V. Vrba,²³ E. Vznuzdaev,⁴⁶ M. Wagner,^30,47 D. Walker,⁵⁴ X. R. Wang,⁴² Y. Watanabe,^47,48 F. Wei,²⁴ J. Wessels,³⁷ S. N. White,⁶ D. Winter,¹² C. L. Woody,⁶ M. Wysocki,¹¹ W. Xie,⁴⁸ Y. L. Yamaguchi,⁶⁰ K. Yamaura,²⁰ R. Yang,²² A. Yanovich,²¹ Z. Yasin,⁷ J. Ying,¹⁹ S. Yokkaichi,^47,48 G. R. Young,⁴³ I. Younus,⁴¹ I. E. Yushmanov,²⁹ W. A. Zajc,¹² O. Zaudtke,³⁷ C. Zhang,⁴³ S. Zhou,⁹ J. Zimányi,²⁷ and L. Zolin²⁵

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

The momentum distribution of electrons from semileptonic decays of charm and bottom quarks for midrapidity |y|<0.35 in p+p collisions at =200 GeV is measured by the PHENIX experiment at the Relativistic Heavy Ion Collider over the transverse momentum range 2<p_T<7 GeV/c. The ratio of the yield of electrons from bottom to that from charm is presented. The ratio is determined using partial D/e^±KX (K unidentified) reconstruction. It is found that the yield of electrons from bottom becomes significant above 4 GeV/c in p_T. A fixed-order-plus-next-to-leading-log perturbative quantum chromodynamics calculation agrees with the data within the theoretical and experimental uncertainties. The extracted total bottom production cross section at this energy is =3.2(stat)(syst)µb.

©2009 The American Physical Society

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