Phys. Rev. C
71,
064906
(2005)
[10 pages]
Event-wise 〈pt〉 fluctuations in Au-Au collisions at √sNN=130 GeV
J. Adams et al. STAR Collaboration
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J. Adams3, C. Adler12, M. M. Aggarwal25, Z. Ahammed28, J. Amonett17, B. D. Anderson17, M. Anderson5, D. Arkhipkin11, G. S. Averichev10, S. K. Badyal16, J. Balewski13, O. Barannikova28,10, L. S. Barnby17, J. Baudot15, S. Bekele24, V. V. Belaga10, R. Bellwied41, J. Berger12, B. I. Bezverkhny43, S. Bhardwaj29, P. Bhaskar38, A. K. Bhati25, H. Bichsel40, A. Billmeier41, L. C. Bland2, C. O. Blyth3, B. E. Bonner30, M. Botje23, A. Boucham34, A. Brandin21, A. Bravar2, R. V. Cadman1, X. Z. Cai33, H. Caines43, M. Calderón de la Barca Sánchez2, J. Carroll18, J. Castillo18, M. Castro41, D. Cebra45, P. Chaloupka9, S. Chattopadhyay38, H. F. Chen32, Y. Chen6, S. P. Chernenko10, M. Cherney8, A. Chikanian43, B. Choi36, W. Christie2, J. P. Coffin15, T. M. Cormier41, J. G. Cramer40, H. J. Crawford4, D. Das38, S. Das38, A. A. Derevschikov27, L. Didenko2, T. Dietel12, X. Dong32,18, J. E. Draper5, F. Du43, A. K. Dubey14, V. B. Dunin10, J. C. Dunlop2, M. R. Dutta Majumdar38, V. Eckardt19, L. G. Efimov10, V. Emelianov21, J. Engelage4, G. Eppley30, B. Erazmus34, M. Estienne34, P. Fachini2, V. Faine2, J. Faivre15, R. Fatemi13, K. Filimonov18, P. Filip9, E. Finch43, Y. Fisyak2, D. Flierl12, K. J. Foley2, J. Fu42, C. A. Gagliardi35, M. S. Ganti38, T. D. Gutierrez5, N. Gagunashvili10, J. Gans43, L. Gaudichet34, M. Germain15, F. Geurts30, V. Ghazikhanian6, P. Ghosh38, J. E. Gonzalez6, O. Grachov41, V. Grigoriev21, S. Gronstal8, D. Grosnick37, M. Guedon15, S. M. Guertin6, A. Gupta16, E. Gushin21, T. J. Hallman2, D. Hardtke18, J. W. Harris43, M. Heinz43, T. W. Henry35, S. Heppelmann26, T. Herston28, B. Hippolyte43, A. Hirsch28, E. Hjort18, G. W. Hoffmann36, M. Horsley43, H. Z. Huang6, S. L. Huang32, T. J. Humanic24, G. Igo6, A. Ishihara36, P. Jacobs18, W. W. Jacobs13, M. Janik39, I. Johnson18, P. G. Jones3, E. G. Judd4, S. Kabana43, M. Kaneta18, M. Kaplan7, D. Keane17, J. Kiryluk6, A. Kisiel39, J. Klay18, S. R. Klein18, A. Klyachko13, D. D. Koetke37, T. Kollegger12, A. S. Konstantinov27, M. Kopytine17, L. Kotchenda21, A. D. Kovalenko10, M. Kramer22, P. Kravtsov21, K. Krueger1, C. Kuhn15, A. I. Kulikov10, A. Kumar25, G. J. Kunde43, C. L. Kunz7, R. Kh. Kutuev11, A. A. Kuznetsov10, M. A. C. Lamont3, J. M. Landgraf2, S. Lange12, C. P. Lansdell36, B. Lasiuk43, F. Laue2, J. Lauret2, A. Lebedev2, R. Lednický10, V. M. Leontiev27, M. J. LeVine2, C. Li32, Q. Li41, S. J. Lindenbaum22, M. A. Lisa24, F. Liu42, L. Liu42, Z. Liu42, Q. J. Liu40, T. Ljubicic2, W. J. Llope30, H. Long6, R. S. Longacre2, M. Lopez-Noriega24, W. A. Love2, T. Ludlam2, D. Lynn2, J. Ma46, Y. G. Ma33, D. Magestro24, S. Mahajan16, L. K. Mangotra16, D. P. Mahapatra14, R. Majka43, R. Manweiler37, S. Margetis17, C. Markert43, L. Martin34, J. Marx18, H. S. Matis18, Yu. A. Matulenko27, T. S. McShane8, F. Meissner18, Yu. Melnick27, A. Meschanin27, M. Messer2, M. L. Miller43, Z. Milosevich7, N. G. Minaev27, C. Mironov17, D. Mishra14, J. Mitchell30, B. Mohanty38, L. Molnar28, C. F. Moore36, M. J. Mora-Corral19, V. Morozov18, M. M. de Moura41, M. G. Munhoz31, B. K. Nandi38, S. K. Nayak16, T. K. Nayak38, J. M. Nelson3, P. Nevski2, V. A. Nikitin11, L. V. Nogach27, B. Norman17, S. B. Nurushev27, G. Odyniec18, A. Ogawa2, V. Okorokov21, M. Oldenburg18, D. Olson18, G. Paic24, S. U. Pandey41, S. K. Pal38, Y. Panebratsev47, S. Y. Panitkin2, A. I. Pavlinov41, T. Pawlak39, V. Perevoztchikov2, W. Peryt39, V. A. Petrov11, S. C. Phatak14, R. Picha5, M. Planinic44, J. Pluta39, N. Porile28, J. Porter2, A. M. Poskanzer18, M. Potekhin2, E. Potrebenikova10, B. V. K. S. Potukuchi16, D. Prindle40, C. Pruneau41, J. Putschke19, G. Rai18, G. Rakness13, R. Raniwala29, S. Raniwala29, O. Ravel34, R. L. Ray36, S. V. Razin10,13, D. Reichhold28, J. G. Reid40, G. Renault34, F. Retiere18, A. Ridiger21, H. G. Ritter18, J. B. Roberts30, O. V. Rogachevski10, J. L. Romero5, A. Rose41, C. Roy34, L. J. Ruan32,12, R. Sahoo14, I. Sakrejda18, S. Salur43, J. Sandweiss43, I. Savin11, J. Schambach36, R. P. Scharenberg28, N. Schmitz19, L. S. Schroeder18, K. Schweda18, J. Seger8, D. Seliverstov21, P. Seyboth19, E. Shahaliev10, M. Shao32, M. Sharma25, K. E. Shestermanov27, S. S. Shimanskii10, R. N. Singaraju38, F. Simon19, G. Skoro10, N. Smirnov43, R. Snellings23, G. Sood25, P. Sorensen6, J. Sowinski13, H. M. Spinka1, B. Srivastava28, S. Stanislaus37, R. Stock12, A. Stolpovsky41, M. Strikhanov21, B. Stringfellow28, C. Struck12, A. A. P. Suaide41, E. Sugarbaker24, C. Suire48, M. Šumbera9, B. Surrow2, T. J. M. Symons18, A. Szanto de Toledo31, P. Szarwas39, A. Tai6, J. Takahashi31, A. H. Tang2,23, D. Thein6, J. H. Thomas18, V. Tikhomirov21, M. Tokarev10, M. B. Tonjes20, T. A. Trainor40, S. Trentalange6, R. E. Tribble35, M. D. Trivedi38, V. Trofimov21, O. Tsai6, T. Ullrich2, D. G. Underwood1, G. Van Buren2, A. M. VanderMolen20, A. N. Vasiliev27, M. Vasiliev35, S. E. Vigdor13, Y. P. Viyogi38, W. Waggoner8, F. Wang28, G. Wang17, X. L. Wang32, Z. M. Wang32, H. Ward36, J. W. Watson17, R. Wells24, G. D. Westfall20, C. Whitten, Jr.6, H. Wieman18, R. Willson24, S. W. Wissink13, R. Witt43, J. Wood6, J. Wu32, N. Xu18, Z. Xu2, Z. Z. Xu32, A. E. Yakutin27, E. Yamamoto18, J. Yang6, P. Yepes30, V. I. Yurevich10, Y. V. Zanevski10, I. Zborovský9, H. Zhang43,2, H. Y. Zhang17, W. M. Zhang17, Z. P. Zhang32, P. A. Żołnierczuk13, R. Zoulkarneev11, J. Zoulkarneeva11, and A. N. Zubarev10 (STAR Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439, USA
2Brookhaven National Laboratory, Upton, New York 11973, USA
3University of Birmingham, Birmingham, United Kingdom
4University of California, Berkeley, California 94720, USA
5University of California, Davis, California 95616, USA
6University of California, Los Angeles, California 90095, USA
7Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
8Creighton University, Omaha, Nebraska 68178, USA
9Nuclear Physics Institute AS CR, Řež/Prague, Czech Republic
10Laboratory for High Energy (JINR), Dubna, Russia
11Particle Physics Laboratory (JINR), Dubna, Russia
12University of Frankfurt, Frankfurt, Germany
13Indiana University, Bloomington, Indiana 47408, USA
14Insitute of Physics, Bhubaneswar 751005, India
15Institut de Recherches Subatomiques, Strasbourg, France
16University of Jammu, Jammu 180001, India
17Kent State University, Kent, Ohio 44242, USA
18Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
19Max-Planck-Institut für Physik, Munich, Germany
20Michigan State University, East Lansing, Michigan 48824, USA
21Moscow Engineering Physics Institute, Moscow, Russia
22City College of New York, New York, New York 10031, USA
23NIKHEF, Amsterdam, The Netherlands
24Ohio State University, Columbus, Ohio 43210, USA
25Panjab University, Chandigarh 160014, India
26Pennsylvania State University, University Park, Pennsylvania 16802, USA
27Institute of High Energy Physics, Protvino, Russia
28Purdue University, West Lafayette, Indiana 47907, USA
29University of Rajasthan, Jaipur 302004, India
30Rice University, Houston, Texas 77251, USA
31Universidade de Sao Paulo, Sao Paulo, Brazil
32University of Science & Technology of China, Anhui 230027, China
33Shanghai Institute of Nuclear Research, Shanghai 201800, China
34SUBATECH, Nantes, France
35Texas A&M, College Station, Texas 77843, USA
36University of Texas, Austin, Texas 78712, USA
37Valparaiso University, Valparaiso, Indiana 46383, USA
38Variable Energy Cyclotron Centre, Kolkata 700064, India
39Warsaw University of Technology, Warsaw, Poland
40University of Washington, Seattle, Washington 98195, USA
41Wayne State University, Detroit, Michigan 48201, USA
42Institute of Particle Physics, CCNU (HZNU), Wuhan, 430079 China
43Yale University, New Haven, Connecticut 06520, USA
44University of Zagreb, HR-10002 Zagreb, Croatia
45University of California, Davis, California 95616, USA
46University of California, Los Angeles, California 90095, USA
47Laboratory for High Energy (JINR), Dubna, Russia
48Brookhaven National Laboratory, Upton, New York 11973, USA
Received 29 August 2003; revised 25 April 2005; published 29 June 2005
We present the first large-acceptance measurement of event-wise mean transverse momentum 〈pt〉 fluctuations for Au-Au collisions at nucleon-nucleon center-of-momentum collision energy √sNN = 130 GeV. The observed nonstatistical 〈pt〉 fluctuations substantially exceed in magnitude fluctuations expected from the finite number of particles produced in a typical collision. The r.m.s. fractional width excess of the event-wise 〈pt〉 distribution is 13.7±0.1(stat) ±1.3(syst)% relative to a statistical reference, for the 15% most-central collisions and for charged hadrons within pseudorapidity range |η|<1,2π azimuth, and 0.15≤pt ≤ 2 GeV/c. The width excess varies smoothly but nonmonotonically with collision centrality and does not display rapid changes with centrality which might indicate the presence of critical fluctuations. The reported 〈pt〉 fluctuation excess is qualitatively larger than those observed at lower energies and differs markedly from theoretical expectations. Contributions to 〈pt〉 fluctuations from semihard parton scattering in the initial state and dissipation in the bulk colored medium are discussed.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.71.064906
DOI:
10.1103/PhysRevC.71.064906
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