Phys. Rev. Lett.
97,
162301
(2006)
[6 pages]
Direct Observation of Dijets in Central Au+Au Collisions at √sNN=200 GeV
J. Adams et al. STAR Collaboration
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J. Adams2, M. M. Aggarwal29, Z. Ahammed44, J. Amonett19, B. D. Anderson19, M. Anderson6, D. Arkhipkin12, G. S. Averichev11, Y. Bai27, J. Balewski16, O. Barannikova32, L. S. Barnby2, J. Baudot17, S. Bekele28, V. V. Belaga11, A. Bellingeri-Laurikainen39, R. Bellwied47, B. I. Bezverkhny49, S. Bhardwaj34, A. Bhasin18, A. K. Bhati29, H. Bichsel46, J. Bielcik49, J. Bielcikova49, L. C. Bland3, C. O. Blyth2, S-L. Blyth21, B. E. Bonner35, M. Botje27, J. Bouchet39, A. V. Brandin25, A. Bravar3, M. Bystersky10, R. V. Cadman1, X. Z. Cai38, H. Caines49, M. Calderón de la Barca Sánchez6, J. Castillo27, O. Catu49, D. Cebra6, Z. Chajecki28, P. Chaloupka10, S. Chattopadhyay44, H. F. Chen37, J. H. Chen38, Y. Chen7, J. Cheng42, M. Cherney9, A. Chikanian49, H. A. Choi33, W. Christie3, J. P. Coffin17, T. M. Cormier47, M. R. Cosentino36, J. G. Cramer46, H. J. Crawford5, D. Das44, S. Das44, M. Daugherity41, M. M. de Moura36, T. G. Dedovich11, M. DePhillips3, A. A. Derevschikov31, L. Didenko3, T. Dietel13, P. Djawotho16, S. M. Dogra18, W. J. Dong7, X. Dong37, J. E. Draper6, F. Du49, V. B. Dunin11, J. C. Dunlop3, M. R. Dutta Mazumdar44, V. Eckardt23, W. R. Edwards21, L. G. Efimov11, V. Emelianov25, J. Engelage5, G. Eppley35, B. Erazmus39, M. Estienne17, P. Fachini3, R. Fatemi22, J. Fedorisin11, K. Filimonov21, P. Filip12, E. Finch49, V. Fine3, Y. Fisyak3, J. Fu48, C. A. Gagliardi40, L. Gaillard2, J. Gans49, M. S. Ganti44, V. Ghazikhanian7, P. Ghosh44, J. E. Gonzalez7, Y. G. Gorbunov9, H. Gos45, O. Grebenyuk27, D. Grosnick43, S. M. Guertin7, K. S. F. F. Guimaraes36, Y. Guo47, N. Gupta18, T. D. Gutierrez6, B. Haag6, T. J. Hallman3, A. Hamed47, J. W. Harris49, W. He16, M. Heinz49, T. W. Henry40, S. Hepplemann30, B. Hippolyte17, A. Hirsch32, E. Hjort21, G. W. Hoffmann41, M. J. Horner21, H. Z. Huang7, S. L. Huang37, E. W. Hughes4, T. J. Humanic28, G. Igo7, P. Jacobs21, W. W. Jacobs16, P. Jakl10, F. Jia20, H. Jiang7, P. G. Jones2, E. G. Judd5, S. Kabana39, K. Kang42, J. Kapitan10, M. Kaplan8, D. Keane19, A. Kechechyan11, V. Yu. Khodyrev31, B. C. Kim33, J. Kiryluk22, A. Kisiel45, E. M. Kislov11, S. R. Klein21, D. D. Koetke43, T. Kollegger13, M. Kopytine19, L. Kotchenda25, V. Kouchpil10, K. L. Kowalik21, M. Kramer26, P. Kravtsov25, V. I. Kravtsov31, K. Krueger1, C. Kuhn17, A. I. Kulikov11, A. Kumar29, A. A. Kuznetsov11, M. A. C. Lamont49, J. M. Landgraf3, S. Lange13, S. LaPointe47, F. Laue3, J. Lauret3, A. Lebedev3, R. Lednicky12, C-H. Lee33, S. Lehocka11, M. J. LeVine3, C. Li37, Q. Li47, Y. Li42, G. Lin49, S. J. Lindenbaum26, M. A. Lisa28, F. Liu48, H. Liu37, J. Liu35, L. Liu48, Z. Liu48, T. Ljubicic3, W. J. Llope35, H. Long7, R. S. Longacre3, M. Lopez-Noriega28, W. A. Love3, Y. Lu48, T. Ludlam3, D. Lynn3, G. L. Ma38, J. G. Ma7, Y. G. Ma38, D. Magestro28, D. P. Mahapatra14, R. Majka49, L. K. Mangotra18, R. Manweiler43, S. Margetis19, C. Markert19, L. Martin39, H. S. Matis21, Yu. A. Matulenko31, C. J. McClain1, T. S. McShane9, Yu. Melnick31, A. Meschanin31, M. L. Miller22, N. G. Minaev31, S. Mioduszewski40, C. Mironov19, A. Mischke27, D. K. Mishra14, J. Mitchell35, B. Mohanty44, L. Molnar32, C. F. Moore41, D. A. Morozov31, M. G. Munhoz36, B. K. Nandi15, C. Nattrass49, T. K. Nayak44, J. M. Nelson2, P. K. Netrakanti44, V. A. Nikitin12, L. V. Nogach31, S. B. Nurushev31, G. Odyniec21, A. Ogawa3, V. Okorokov25, M. Oldenburg21, D. Olson21, M. Pachr10, S. K. Pal44, Y. Panebratsev11, S. Y. Panitkin3, A. I. Pavlinov47, T. Pawlak45, T. Peitzmann27, V. Perevoztchikov3, C. Perkins5, W. Peryt45, V. A. Petrov47, S. C. Phatak14, R. Picha6, M. Planinic50, J. Pluta45, N. Poljak50, N. Porile32, J. Porter46, A. M. Poskanzer21, M. Potekhin3, E. Potrebenikova11, B. V. K. S. Potukuchi18, D. Prindle46, C. Pruneau47, J. Putschke21, G. Rakness30, R. Raniwala34, S. Raniwala34, R. L. Ray41, S. V. Razin11, J. Reinnarth39, D. Relyea4, F. Retiere21, A. Ridiger25, H. G. Ritter21, J. B. Roberts35, O. V. Rogachevskiy11, J. L. Romero6, A. Rose21, C. Roy39, L. Ruan21, M. J. Russcher27, R. Sahoo14, I. Sakrejda21, S. Salur49, J. Sandweiss49, M. Sarsour40, P. S. Sazhin11, J. Schambach41, R. P. Scharenberg32, N. Schmitz23, K. Schweda21, J. Seger9, I. Selyuzhenkov47, P. Seyboth23, A. Shabetai21, E. Shahaliev11, M. Shao37, M. Sharma29, W. Q. Shen38, S. S. Shimanskiy11, E Sichtermann21, F. Simon22, R. N. Singaraju44, N. Smirnov49, R. Snellings27, G. Sood43, P. Sorensen3, J. Sowinski16, J. Speltz17, H. M. Spinka1, B. Srivastava32, A. Stadnik11, T. D. S. Stanislaus43, R. Stock13, A. Stolpovsky47, M. Strikhanov25, B. Stringfellow32, A. A. P. Suaide36, E. Sugarbaker28, M. Sumbera10, Z. Sun20, B. Surrow22, M. Swanger9, T. J. M. Symons21, A. Szanto de Toledo36, A. Tai7, J. Takahashi36, A. H. Tang3, T. Tarnowsky32, D. Thein7, J. H. Thomas21, A. R. Timmins2, S. Timoshenko25, M. Tokarev11, S. Trentalange7, R. E. Tribble40, O. D. Tsai7, J. Ulery32, T. Ullrich3, D. G. Underwood1, G. Van Buren3, N. van der Kolk27, M. van Leeuwen21, A. M. Vander Molen24, R. Varma15, I. M. Vasilevski12, A. N. Vasiliev31, R. Vernet17, S. E. Vigdor16, Y. P. Viyogi44, S. Vokal11, S. A. Voloshin47, W. T. Waggoner9, F. Wang32, G. Wang19, J. S. Wang20, X. L. Wang37, Y. Wang42, J. W. Watson19, J. C. Webb16, G. D. Westfall24, A. Wetzler21, C. Whitten, Jr.7, H. Wieman21, S. W. Wissink16, R. Witt49, J. Wood7, J. Wu37, N. Xu21, Q. H. Xu21, Z. Xu3, P. Yepes35, I-K. Yoo33, V. I. Yurevich11, W. Zhan20, H. Zhang3, W. M. Zhang19, Y. Zhang37, Z. P. Zhang37, Y. Zhao37, C. Zhong38, R. Zoulkarneev12, Y. Zoulkarneeva12, A. N. Zubarev11, and J. X. Zuo38 (STAR Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439, USA
2University of Birmingham, Birmingham, United Kingdom
3Brookhaven National Laboratory, Upton, New York 11973, USA
4California Institute of Technology, Pasadena, California 91125, USA
5University of California, Berkeley, California 94720, USA
6University of California, Davis, California 95616, USA
7University of California, Los Angeles, California 90095, USA
8Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
9Creighton University, Omaha, Nebraska 68178, USA
10Nuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech Republic
11Laboratory for High Energy (JINR), Dubna, Russia
12Particle Physics Laboratory (JINR), Dubna, Russia
13University of Frankfurt, Frankfurt, Germany
14Institute of Physics, Bhubaneswar 751005, India
15Indian Institute of Technology, Mumbai, India
16Indiana University, Bloomington, Indiana 47408, USA
17Institut de Recherches Subatomiques, Strasbourg, France
18University of Jammu, Jammu 180001, India
19Kent State University, Kent, Ohio 44242, USA
20Institute of Modern Physics, Lanzhou, 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, New York 10031, USA
27NIKHEF and Utrecht University, Amsterdam, The Netherlands
28The Ohio State University, Columbus, Ohio 43210, USA
29Panjab University, Chandigarh 160014, India
30Pennsylvania State University, University Park, Pennsylvania 16802, USA
31Institute of High Energy Physics, Protvino, Russia
32Purdue University, West Lafayette, Indiana 47907, USA
33Pusan National University, Pusan, Republic of Korea
34University of Rajasthan, Jaipur 302004, India
35Rice University, Houston, Texas 77251, USA
36Universidade de Sao Paulo, Sao Paulo, Brazil
37University of Science & Technology of China, Hefei 230026, China
38Shanghai Institute of Applied Physics, Shanghai 201800, China
39SUBATECH, Nantes, France
40Texas A&M University, College Station, Texas 77843, USA
41University of Texas, Austin, Texas 78712, USA
42Tsinghua University, Beijing 100084, China
43Valparaiso University, Valparaiso, Indiana 46383, USA
44Variable Energy Cyclotron Centre, Kolkata 700064, India
45Warsaw University of Technology, Warsaw, Poland
46University of Washington, Seattle, Washington 98195, USA
47Wayne State University, Detroit, Michigan 48201, USA
48Institute of Particle Physics, CCNU (HZNU), Wuhan 430079, China
49Yale University, New Haven, Connecticut 06520, USA
50University of Zagreb, Zagreb, HR-10002, Croatia
Received 28 April 2006; published 16 October 2006
The STAR Collaboration at the Relativistic Heavy Ion Collider reports measurements of azimuthal correlations of high transverse momentum (pT) charged hadrons in Au+Au collisions at higher pT than reported previously. As pT is increased, a narrow, back-to-back peak emerges above the decreasing background, providing a clear dijet signal for all collision centralities studied. Using these correlations, we perform a systematic study of dijet production and suppression in nuclear collisions, providing new constraints on the mechanisms underlying partonic energy loss in dense matter.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.162301
DOI:
10.1103/PhysRevLett.97.162301
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