Phys. Rev. C
71,
064902
(2005)
[15 pages]
K(892)* resonance production in Au+Au and p+p collisions at √sNN=200 GeV
J. Adams et al. STAR Collaboration
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J. Adams3, M. M. Aggarwal29, Z. Ahammed43, J. Amonett20, B. D. Anderson20, D. Arkhipkin13, G. S. Averichev12, S. K. Badyal19, Y. Bai27, J. Balewski17, O. Barannikova32, L. S. Barnby3, J. Baudot18, S. Bekele28, V. V. Belaga12, R. Bellwied46, J. Berger14, B. I. Bezverkhny48, S. Bharadwaj33, A. Bhasin19, A. K. Bhati29, V. S. Bhatia29, H. Bichsel45, A. Billmeier46, L. C. Bland4, C. O. Blyth3, B. E. Bonner34, M. Botje27, A. Boucham38, A. V. Brandin25, A. Bravar4, M. Bystersky11, R. V. Cadman1, X. Z. Cai37, H. Caines48, M. Calderón de la Barca Sánchez17, J. Castillo21, D. Cebra7, Z. Chajecki44, P. Chaloupka11, S. Chattopadhyay43, H. F. Chen36, Y. Chen8, J. Cheng41, M. Cherney10, A. Chikanian48, W. Christie4, J. P. Coffin18, T. M. Cormier46, J. G. Cramer45, H. J. Crawford6, D. Das43, S. Das43, M. M. de Moura35, A. A. Derevschikov31, L. Didenko4, T. Dietel14, S. M. Dogra19, W. J. Dong8, X. Dong36, J. E. Draper7, F. Du48, A. K. Dubey15, V. B. Dunin12, J. C. Dunlop4, M. R. Dutta Mazumdar43, V. Eckardt23, W. R. Edwards21, L. G. Efimov12, V. Emelianov25, J. Engelage6, G. Eppley34, B. Erazmus38, M. Estienne38, P. Fachini4, J. Faivre18, R. Fatemi17, J. Fedorisin12, K. Filimonov21, P. Filip11, E. Finch48, V. Fine4, Y. Fisyak4, K. Fomenko12, J. Fu41, C. A. Gagliardi39, L. Gaillard3, J. Gans48, M. S. Ganti43, L. Gaudichet38, F. Geurts34, V. Ghazikhanian8, P. Ghosh43, J. E. Gonzalez8, O. Grachov46, O. Grebenyuk27, D. Grosnick42, S. M. Guertin8, Y. Guo46, A. Gupta19, T. D. Gutierrez7, T. J. Hallman4, A. Hamed46, D. Hardtke21, J. W. Harris48, M. Heinz2, T. W. Henry39, S. Hepplemann30, B. Hippolyte18, A. Hirsch32, E. Hjort21, G. W. Hoffmann40, H. Z. Huang8, S. L. Huang36, E. W. Hughes5, T. J. Humanic28, G. Igo8, A. Ishihara40, P. Jacobs21, W. W. Jacobs17, M. Janik44, H. Jiang8, P. G. Jones3, E. G. Judd6, S. Kabana2, K. Kang41, M. Kaplan9, D. Keane20, V. Yu. Khodyrev31, J. Kiryluk22, A. Kisiel44, E. M. Kislov12, J. Klay21, S. R. Klein21, D. D. Koetke42, T. Kollegger14, M. Kopytine20, L. Kotchenda25, M. Kramer26, P. Kravtsov25, V. I. Kravtsov31, K. Krueger1, C. Kuhn18, A. I. Kulikov12, A. Kumar29, R. Kh. Kutuev13, A. A. Kuznetsov12, M. A. C. Lamont48, J. M. Landgraf4, S. Lange14, F. Laue4, J. Lauret4, A. Lebedev4, R. Lednicky12, S. Lehocka12, M. J. LeVine4, C. Li36, Q. Li46, Y. Li41, G. Lin48, S. J. Lindenbaum26, M. A. Lisa28, F. Liu47, L. Liu47, Q. J. Liu45, Z. Liu47, T. Ljubicic4, W. J. Llope34, H. Long8, R. S. Longacre4, M. Lopez-Noriega28, W. A. Love4, Y. Lu47, T. Ludlam4, D. Lynn4, G. L. Ma37, J. G. Ma8, Y. G. Ma37, D. Magestro28, S. Mahajan19, D. P. Mahapatra15, R. Majka48, L. K. Mangotra19, R. Manweiler42, S. Margetis20, C. Markert20, L. Martin38, J. N. Marx21, H. S. Matis21, Yu. A. Matulenko31, C. J. McClain1, T. S. McShane10, F. Meissner21, Yu. Melnick31, A. Meschanin31, M. L. Miller22, N. G. Minaev31, C. Mironov20, A. Mischke27, D. K. Mishra15, J. Mitchell34, B. Mohanty43, L. Molnar32, C. F. Moore40, D. A. Morozov31, M. G. Munhoz35, B. K. Nandi43, S. K. Nayak19, T. K. Nayak43, J. M. Nelson3, P. K. Netrakanti43, V. A. Nikitin13, L. V. Nogach31, S. B. Nurushev31, G. Odyniec21, A. Ogawa4, V. Okorokov25, M. Oldenburg21, D. Olson21, S. K. Pal43, Y. Panebratsev12, S. Y. Panitkin4, A. I. Pavlinov46, T. Pawlak44, T. Peitzmann27, V. Perevoztchikov4, C. Perkins6, W. Peryt44, V. A. Petrov13, S. C. Phatak15, R. Picha7, M. Planinic49, J. Pluta44, N. Porile32, J. Porter45, A. M. Poskanzer21, M. Potekhin4, E. Potrebenikova12, B. V. K. S. Potukuchi19, D. Prindle45, C. Pruneau46, J. Putschke23, G. Rakness30, R. Raniwala33, S. Raniwala33, O. Ravel38, R. L. Ray40, S. V. Razin12, D. Reichhold32, J. G. Reid45, G. Renault38, F. Retiere21, A. Ridiger25, H. G. Ritter21, J. B. Roberts34, O. V. Rogachevskiy12, J. L. Romero7, A. Rose46, C. Roy38, L. Ruan36, R. Sahoo15, I. Sakrejda21, S. Salur48, J. Sandweiss48, M. Sarsour17, I. Savin13, P. S. Sazhin12, J. Schambach40, R. P. Scharenberg32, N. Schmitz23, K. Schweda21, J. Seger10, P. Seyboth23, E. Shahaliev12, M. Shao36, W. Shao5, M. Sharma29, W. Q. Shen37, K. E. Shestermanov31, S. S. Shimanskiy12, E. Sichtermann21, F. Simon23, R. N. Singaraju43, G. Skoro12, N. Smirnov48, R. Snellings27, G. Sood42, P. Sorensen21, J. Sowinski17, J. Speltz18, H. M. Spinka1, B. Srivastava32, A. Stadnik12, T. D. S. Stanislaus42, R. Stock14, A. Stolpovsky46, M. Strikhanov25, B. Stringfellow32, A. A. P. Suaide35, E. Sugarbaker28, C. Suire4, M. Sumbera11, B. Surrow22, T. J. M. Symons21, A. Szanto de Toledo35, P. Szarwas44, A. Tai8, J. Takahashi35, A. H. Tang27, T. Tarnowsky32, D. Thein8, J. H. Thomas21, S. Timoshenko25, M. Tokarev12, T. A. Trainor45, S. Trentalange8, R. E. Tribble39, O. D. Tsai8, J. Ulery32, T. Ullrich4, D. G. Underwood1, A. Urkinbaev12, G. Van Buren4, M. van Leeuwen21, A. M. Vander Molen24, R. Varma16, I. M. Vasilevski13, A. N. Vasiliev31, R. Vernet18, S. E. Vigdor17, Y. P. Viyogi43, S. Vokal12, S. A. Voloshin46, M. Vznuzdaev25, W. T. Waggoner10, F. Wang32, G. Wang20, G. Wang5, X. L. Wang36, Y. Wang40, Y. Wang41, Z. M. Wang36, H. Ward40, J. W. Watson20, J. C. Webb17, R. Wells28, G. D. Westfall24, A. Wetzler21, C. Whitten Jr.8, H. Wieman21, S. W. Wissink17, R. Witt2, J. Wood8, J. Wu36, N. Xu21, Z. Xu4, Z. Z. Xu36, E. Yamamoto21, P. Yepes34, V. I. Yurevich12, Y. V. Zanevsky12, H. Zhang4, W. M. Zhang20, Z. P. Zhang36, R. Zoulkarneev13, Y. Zoulkarneeva13, and A. N. Zubarev12 (STAR Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439, USA
2University of Bern, CH-3012 Bern, Switzerland
3University of Birmingham, Birmingham, United Kingdom
4Brookhaven National Laboratory, Upton, New York 11973, USA
5California Institute of Technology, Pasadena, California 91125, USA
6University of California, Berkeley, California 94720, USA
7University of California, Davis, California 95616, USA
8University of California, Los Angeles, California 90095, USA
9Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
10Creighton University, Omaha, Nebraska 68178, USA
11Nuclear Physics Institute AS CR, 250 68 Rez/Prague, Czech Republic
12Laboratory for High Energy (JINR), Dubna, Russia
13Particle Physics Laboratory (JINR), Dubna, Russia
14University of Frankfurt, Frankfurt, Germany
15Institute of Physics, Bhubaneswar 751005, India
16Indian Institute of Technology, Mumbai, India
17Indiana University, Bloomington, Indiana 47408, USA
18Institut de Recherches Subatomiques, Strasbourg, France
19University of Jammu, Jammu 180001, India
20Kent State University, Kent, Ohio 44242, USA
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, Amsterdam, The Netherlands
28Ohio 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
33University of Rajasthan, Jaipur 302004, India
34Rice University, Houston, Texas 77251, USA
35Universidade de São Paulo, São Paulo, Brazil
36University of Science & Technology of China, Anhui 230027, China
37Shanghai Institute of Applied Physics, Shanghai 201800, China
38SUBATECH, Nantes, France
39Texas A&M University, College Station, Texas 77843, USA
40University of Texas, Austin, Texas 78712, USA
41Tsinghua University, Beijing 100084, China
42Valparaiso University, Valparaiso, Indiana 46383, USA
43Variable Energy Cyclotron Centre, Kolkata 700064, India
44Warsaw University of Technology, Warsaw, Poland
45University of Washington, Seattle, Washington 98195, USA
46Wayne State University, Detroit, Michigan 48201, USA
47Institute of Particle Physics, CCNU (HZNU), Wuhan 430079, China
48Yale University, New Haven, Connecticut 06520, USA
49University of Zagreb, Zagreb, HR-10002, Croatia
Received 9 December 2004; published 6 June 2005
The short-lived K(892)* resonance provides an efficient tool to probe properties of the hot and dense medium produced in relativistic heavy-ion collisions. We report measurements of K* in √sNN=200 GeV Au+Au and p+p collisions reconstructed via its hadronic decay channels K(892)*0→Kπ and K(892)*±→KS0π± using the STAR detector at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. The K*0 mass has been studied as a function of pT in minimum bias p+p and central Au+Au collisions. The K* pT spectra for minimum bias p+p interactions and for Au+Au collisions in different centralities are presented. The K*/K yield ratios for all centralities in Au+Au collisions are found to be significantly lower than the ratio in minimum bias p+p collisions, indicating the importance of hadronic interactions between chemical and kinetic freeze-outs. A significant nonzero K*0 elliptic flow (v2) is observed in Au+Au collisions and is compared to the KS0 and Λ v2. The nuclear modification factor of K* at intermediate pT is similar to that of KS0 but different from Λ. This establishes a baryon-meson effect over a mass effect in the particle production at intermediate pT (2<pT≤4 GeV/c).
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.71.064902
DOI:
10.1103/PhysRevC.71.064902
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