APS » Phys. Rev. C » Volume 80 » Issue 4

B. I. Abelev,⁸ M. M. Aggarwal,³⁰ Z. Ahammed,⁴⁷ A. V. Alakhverdyants,¹⁷ B. D. Anderson,¹⁸ D. Arkhipkin,³ G. S. Averichev,¹⁷ J. Balewski,²² O. Barannikova,⁸ L. S. Barnby,² J. Baudot,¹⁵ S. Baumgart,⁵² D. R. Beavis,³ R. Bellwied,⁵⁰ F. Benedosso,²⁷ M. J. Betancourt,²² R. R. Betts,⁸ A. Bhasin,¹⁶ A. K. Bhati,³⁰ H. Bichsel,⁴⁹ J. Bielcik,¹⁰ J. Bielcikova,¹¹ B. Biritz,⁶ L. C. Bland,³ I. Bnzarov,¹⁷ M. Bombara,² B. E. Bonner,³⁶ J. Bouchet,¹⁸ E. Braidot,²⁷ A. V. Brandin,²⁵ E. Bruna,⁵² S. Bueltmann,²⁹ T. P. Burton,² M. Bystersky,¹¹ X. Z. Cai,⁴⁰ H. Caines,⁵² M. Calderón de la Barca Sánchez,⁵ O. Catu,⁵² D. Cebra,⁵ R. Cendejas,⁶ M. C. Cervantes,⁴² Z. Chajecki,²⁸ P. Chaloupka,¹¹ S. Chattopadhyay,⁴⁷ H. F. Chen,³⁸ J. H. Chen,¹⁸ J. Y. Chen,⁵¹ J. Cheng,⁴⁴ M. Cherney,⁹ A. Chikanian,⁵² K. E. Choi,³⁴ W. Christie,³ R. F. Clarke,⁴² M. J. M. Codrington,⁴² R. Corliss,²² T. M. Cormier,⁵⁰ M. R. Cosentino,³⁷ J. G. Cramer,⁴⁹ H. J. Crawford,⁴ D. Das,⁵ S. Dash,¹² M. Daugherity,⁴³ L. C. De Silva,⁵⁰ T. G. Dedovich,¹⁷ M. DePhillips,³ A. A. Derevschikov,³² R. Derradi de Souza,⁷ L. Didenko,³ P. Djawotho,⁴² S. M. Dogra,¹⁶ X. Dong,²¹ J. L. Drachenberg,⁴² J. E. Draper,⁵ J. C. Dunlop,³ M. R. Dutta Mazumdar,⁴⁷ L. G. Efimov,¹⁷ E. Elhalhuli,² M. Elnimr,⁵⁰ J. Engelage,⁴ G. Eppley,³⁶ B. Erazmus,⁴¹ M. Estienne,⁴¹ L. Eun,³¹ P. Fachini,³ R. Fatemi,¹⁹ J. Fedorisin,¹⁷ A. Feng,⁵¹ P. Filip,¹⁷ E. Finch,⁵² V. Fine,³ Y. Fisyak,³ C. A. Gagliardi,⁴² L. Gaillard,² D. R. Gangadharan,⁶ M. S. Ganti,⁴⁷ E. J. Garcia-Solis,⁸ A. Geromitsos,⁴¹ F. Geurts,³⁶ V. Ghazikhanian,⁶ P. Ghosh,⁴⁷ Y. N. Gorbunov,⁹ A. Gordon,³ O. Grebenyuk,²¹ D. Grosnick,⁴⁶ B. Grube,³⁴ S. M. Guertin,⁶ K. S. F. F. Guimaraes,³⁷ A. Gupta,¹⁶ N. Gupta,¹⁶ W. Guryn,³ B. Haag,⁵ T. J. Hallman,³ A. Hamed,⁴² J. W. Harris,⁵² W. He,¹⁴ M. Heinz,⁵² S. Heppelmann,³¹ B. Hippolyte,¹⁵ A. Hirsch,³³ E. Hjort,²¹ A. M. Hoffman,²² G. W. Hoffmann,⁴³ D. J. Hofman,⁸ R. S. Hollis,⁸ H. Z. Huang,⁶ T. J. Humanic,²⁸ L. Huo,⁴² G. Igo,⁶ A. Iordanova,⁸ P. Jacobs,²¹ W. W. Jacobs,¹⁴ P. Jakl,¹¹ C. Jena,¹² F. Jin,⁴⁰ C. L. Jones,²² P. G. Jones,² J. Joseph,¹⁸ E. G. Judd,⁴ S. Kabana,⁴¹ K. Kajimoto,⁴³ K. Kang,⁴⁴ J. Kapitan,¹¹ K. Kauder,⁸ D. Keane,¹⁸ A. Kechechyan,¹⁷ D. Kettler,⁴⁹ V. Yu. Khodyrev,³² D. P. Kikola,²¹ J. Kiryluk,²¹ A. Kisiel,⁴⁸ S. R. Klein,²¹ A. G. Knospe,⁵² A. Kocoloski,²² D. D. Koetke,⁴⁶ J. Konzer,³³ M. Kopytine,¹⁸ I. Koralt,²⁹ W. Korsch,¹⁹ L. Kotchenda,²⁵ V. Kouchpil,¹¹ P. Kravtsov,²⁵ V. I. Kravtsov,³² K. Krueger,¹ M. Krus,¹⁰ C. Kuhn,¹⁵ L. Kumar,³⁰ P. Kurnadi,⁶ M. A. C. Lamont,³ J. M. Landgraf,³ S. LaPointe,⁵⁰ J. Lauret,³ A. Lebedev,³ R. Lednicky,¹⁷ C. -H. Lee,³⁴ J. H. Lee,³ W. Leight,²² M. J. LeVine,³ C. Li,³⁸ N. Li,⁵¹ Y. Li,⁴⁴ G. Lin,⁵² S. J. Lindenbaum,²⁶ M. A. Lisa,²⁸ F. Liu,⁵¹ H. Liu,⁵ J. Liu,³⁶ L. Liu,⁵¹ T. Ljubicic,³ W. J. Llope,³⁶ R. S. Longacre,³ W. A. Love,³ Y. Lu,³⁸ T. Ludlam,³ G. L. Ma,⁴⁰ Y. G. Ma,⁴⁰ D. P. Mahapatra,¹² R. Majka,⁵² O. I. Mall,⁵ L. K. Mangotra,¹⁶ R. Manweiler,⁴⁶ S. Margetis,¹⁸ C. Markert,⁴³ H. Masui,²¹ H. S. Matis,²¹ Yu. A. Matulenko,³² D. McDonald,³⁶ T. S. McShane,⁹ A. Meschanin,³² R. Milner,²² N. G. Minaev,³² S. Mioduszewski,⁴² A. Mischke,²⁷ B. Mohanty,⁴⁷ D. A. Morozov,³² M. G. Munhoz,³⁷ B. K. Nandi,¹³ C. Nattrass,⁵² T. K. Nayak,⁴⁷ J. M. Nelson,² P. K. Netrakanti,³³ M. J. Ng,⁴ L. V. Nogach,³² S. B. Nurushev,³² G. Odyniec,²¹ A. Ogawa,³ H. Okada,³ V. Okorokov,²⁵ D. Olson,²¹ M. Pachr,¹⁰ B. S. Page,¹⁴ S. K. Pal,⁴⁷ Y. Pandit,¹⁸ Y. Panebratsev,¹⁷ T. Pawlak,⁴⁸ T. Peitzmann,²⁷ V. Perevoztchikov,³ C. Perkins,⁴ W. Peryt,⁴⁸ S. C. Phatak,¹² P. Pile,³ M. Planinic,⁵³ M. A. Ploskon,²¹ J. Pluta,⁴⁸ D. Plyku,²⁹ N. Poljak,⁵³ A. M. Poskanzer,²¹ B. V. K. S. Potukuchi,¹⁶ D. Prindle,⁴⁹ C. Pruneau,⁵⁰ N. K. Pruthi,³⁰ P. R. Pujahari,¹³ J. Putschke,⁵² R. Raniwala,³⁵ S. Raniwala,³⁵ R. L. Ray,⁴³ R. Redwine,²² R. Reed,⁵ A. Ridiger,²⁵ H. G. Ritter,²¹ J. B. Roberts,³⁶ O. V. Rogachevskiy,¹⁷ J. L. Romero,⁵ A. Rose,²¹ C. Roy,⁴¹ L. Ruan,³ M. J. Russcher,²⁷ R. Sahoo,⁴¹ S. Sakai,⁶ I. Sakrejda,²¹ T. Sakuma,²² S. Salur,²¹ J. Sandweiss,⁵² M. Sarsour,⁴² J. Schambach,⁴³ R. P. Scharenberg,³³ N. Schmitz,²³ J. Seger,⁹ I. Selyuzhenkov,¹⁴ P. Seyboth,²³ A. Shabetai,¹⁵ E. Shahaliev,¹⁷ M. Shao,³⁸ M. Sharma,⁵⁰ S. S. Shi,⁵¹ X. -H. Shi,⁴⁰ E. P. Sichtermann,²¹ F. Simon,²³ R. N. Singaraju,⁴⁷ M. J. Skoby,³³ N. Smirnov,⁵² P. Sorensen,³ J. Sowinski,¹⁴ H. M. Spinka,¹ B. Srivastava,³³ T. D. S. Stanislaus,⁴⁶ D. Staszak,⁶ M. Strikhanov,²⁵ B. Stringfellow,³³ A. A. P. Suaide,³⁷ M. C. Suarez,⁸ N. L. Subba,¹⁸ M. Sumbera,¹¹ X. M. Sun,²¹ Y. Sun,³⁸ Z. Sun,²⁰ B. Surrow,²² T. J. M. Symons,²¹ A. Szanto de Toledo,³⁷ J. Takahashi,⁷ A. H. Tang,³ Z. Tang,³⁸ L. H. Tarini,⁵⁰ T. Tarnowsky,²⁴ D. Thein,⁴³ J. H. Thomas,²¹ J. Tian,⁴⁰ A. R. Timmins,⁵⁰ S. Timoshenko,²⁵ D. Tlusty,¹¹ M. Tokarev,¹⁷ T. A. Trainor,⁴⁹ V. N. Tram,²¹ S. Trentalange,⁶ R. E. Tribble,⁴² O. D. Tsai,⁶ J. Ulery,³³ T. Ullrich,³ D. G. Underwood,¹ G. Van Buren,³ G. van Nieuwenhuizen,²² J. A. Vanfossen, Jr.,¹⁸ R. Varma,¹³ G. M. S. Vasconcelos,⁷ A. N. Vasiliev,³² F. Videbaek,³ S. E. Vigdor,¹⁴ Y. P. Viyogi,¹² S. Vokal,¹⁷ S. A. Voloshin,⁵⁰ M. Wada,⁴³ M. Walker,²² F. Wang,³³ G. Wang,⁶ H. Wang,²⁴ J. S. Wang,²⁰ Q. Wang,³³ X. Wang,⁴⁴ X. L. Wang,³⁸ Y. Wang,⁴⁴ G. Webb,¹⁹ J. C. Webb,⁴⁶ G. D. Westfall,²⁴ C. Whitten, Jr.,⁶ H. Wieman,²¹ S. W. Wissink,¹⁴ R. Witt,⁴⁵ Y. Wu,⁵¹ W. Xie,³³ N. Xu,²¹ Q. H. Xu,³⁹ Y. Xu,³⁸ Z. Xu,³ Y. Yang,²⁰ P. Yepes,³⁶ K. Yip,³ I. -K. Yoo,³⁴ Q. Yue,⁴⁴ M. Zawisza,⁴⁸ H. Zbroszczyk,⁴⁸ W. Zhan,²⁰ S. Zhang,⁴⁰ W. M. Zhang,¹⁸ X. P. Zhang,²¹ Y. Zhang,²¹ Z. P. Zhang,³⁸ Y. Zhao,³⁸ C. Zhong,⁴⁰ J. Zhou,³⁶ X. Zhu,⁴⁴ R. Zoulkarneev,¹⁷ Y. Zoulkarneeva,¹⁷ and J. X. Zuo⁴⁰

(STAR Collaboration)

¹Argonne National Laboratory, Argonne, Illinois 60439, USA
²University of Birmingham, Birmingham, United Kingdom
³Brookhaven National Laboratory, Upton, New York 11973, USA
⁴University of California, Berkeley, California 94720, USA
⁵University of California, Davis, California 95616, USA
⁶University of California, Los Angeles, California 90095, USA
⁷Universidade Estadual de Campinas, Sao Paulo, Brazil
⁸University of Illinois at Chicago, Chicago, Illinois 60607, USA
⁹Creighton University, Omaha, Nebraska 68178, USA
¹⁰Czech Technical University in Prague, FNSPE, Prague, CZ-115 19, Czech Republic
¹¹Nuclear Physics Institute AS CR, CZ-250 68 Řež/Prague, Czech Republic
¹²Institute of Physics, Bhubaneswar 751005, India
¹³Indian Institute of Technology, Mumbai, India
¹⁴Indiana University, Bloomington, Indiana 47408, USA
¹⁵Institut de Recherches Subatomiques, Strasbourg, France
¹⁶University of Jammu, Jammu 180001, India
¹⁷Joint Institute for Nuclear Research, Dubna, RU-141980, Russia
¹⁸Kent State University, Kent, Ohio 44242, USA
¹⁹University of Kentucky, Lexington, Kentucky, 40506-0055, USA
²⁰Institute of Modern Physics, Lanzhou, People's Republic of China
²¹Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
²²Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
²³Max-Planck-Institut für Physik, Munich, Germany
²⁴Michigan State University, East Lansing, Michigan 48824, USA
²⁵Moscow Engineering Physics Institute, Moscow, Russia
²⁶City College of New York, New York City, New York 10031, USA
²⁷NIKHEF and Utrecht University, Amsterdam, The Netherlands
²⁸Ohio State University, Columbus, Ohio 43210, USA
²⁹Old Dominion University, Norfolk, Virginia, 23529, USA
³⁰Panjab University, Chandigarh 160014, India
³¹Pennsylvania State University, University Park, Pennsylvania 16802, USA
³²Institute of High Energy Physics, Protvino, Russia
³³Purdue University, West Lafayette, Indiana 47907, USA
³⁴Pusan National University, Pusan, Republic of Korea
³⁵University of Rajasthan, Jaipur 302004, India
³⁶Rice University, Houston, Texas 77251, USA
³⁷Universidade de Sao Paulo, Sao Paulo, Brazil
³⁸University of Science & Technology of China, Hefei 230026, People's Republic of China
³⁹Shandong University, Jinan, Shandong 250100, People's Republic of China
⁴⁰Shanghai Institute of Applied Physics, Shanghai 201800, People's Republic of China
⁴¹SUBATECH, Nantes, France
⁴²Texas A&M University, College Station, Texas 77843, USA
⁴³University of Texas, Austin, Texas 78712, USA
⁴⁴Tsinghua University, Beijing 100084, People's Republic of China
⁴⁵United States Naval Academy, Annapolis, Maryland 21402, USA
⁴⁶Valparaiso University, Valparaiso, Indiana 46383, USA
⁴⁷Variable Energy Cyclotron Centre, Kolkata 700064, India
⁴⁸Warsaw University of Technology, Warsaw, Poland
⁴⁹University of Washington, Seattle, Washington 98195, USA
⁵⁰Wayne State University, Detroit, Michigan 48201, USA
⁵¹Institute of Particle Physics, CCNU (HZNU), Wuhan 430079, People's Republic of China
⁵²Yale University, New Haven, Connecticut 06520, USA
⁵³University of Zagreb, Zagreb, HR-10002, Croatia

The results of midrapidity (0<y<0.8) neutral pion spectra over an extended transverse momentum range (1<p_T<12  GeV/c) in =200  GeV  Au+Au collisions, measured by the STAR experiment, are presented. The neutral pions are reconstructed from photons measured either by the STAR Barrel Electro-Magnetic Calorimeter or by the Time Projection Chamber via tracking of conversion electron-positron pairs. Our measurements are compared to previously published ^± and ⁰ results. The nuclear modification factors R_CP and R_AA of ⁰ are also presented as a function of p_T. In the most central Au+Au collisions, the binary collision scaled ⁰ yield at high p_T is suppressed by a factor of about 5 compared to the expectation from the yield of p+p collisions. Such a large suppression is in agreement with previous observations for light quark mesons and is consistent with the scenario that partons suffer considerable energy loss in the dense medium formed in central nucleus-nucleus collisions at the Relativistic Heavy Ion Collider.

©2009 The American Physical Society

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