Phys. Rev. Lett.
89,
092302
(2002)
[6 pages]
Measurement of Λ and Λ̅ Particles in Au+Au Collisions at √sNN=130 GeV
K. Adcox et al. PHENIX Collaboration
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K. Adcox40, S. S. Adler3, N. N. Ajitanand27, Y. Akiba14, J. Alexander27, L. Aphecetche34, Y. Arai14, S. H. Aronson3, R. Averbeck28, T. C. Awes29, K. N. Barish5, P. D. Barnes19, J. Barrette21, B. Bassalleck25, S. Bathe22, V. Baublis30, A. Bazilevsky12,32, S. Belikov12,13, F. G. Bellaiche29, S. T. Belyaev16, M. J. Bennett19, Y. Berdnikov35, S. Botelho33, M. L. Brooks19, D. S. Brown26, N. Bruner25, D. Bucher22, H. Buesching22, V. Bumazhnov12, G. Bunce3,32, J. Burward-Hoy28, S. Butsyk28,30, T. A. Carey19, P. Chand2, J. Chang5, W. C. Chang1, L. L. Chavez25, S. Chernichenko12, C. Y. Chi8, J. Chiba14, M. Chiu8, R. K. Choudhury2, T. Christ28, T. Chujo3,39, M. S. Chung15,19, P. Chung27, V. Cianciolo29, B. A. Cole8, D. G. D’Enterria34, G. David3, H. Delagrange34, A. Denisov12, A. Deshpande32, E. J. Desmond3, O. Dietzsch33, B. V. Dinesh2, A. Drees28, A. Durum12, D. Dutta2, K. Ebisu24, Y. V. Efremenko29, K. El Chenawi40, H. En’yo17,31, S. Esumi39, L. Ewell3, T. Ferdousi5, D. E. Fields25, S. L. Fokin16, Z. Fraenkel42, A. Franz3, A. D. Frawley9, S. -Y. Fung5, S. Garpman20,*, T. K. Ghosh40, A. Glenn36, A. L. Godoi33, Y. Goto32, S. V. Greene40, M. Grosse Perdekamp32, S. K. Gupta2, W. Guryn3, H. -Å. Gustafsson20, J. S. Haggerty3, H. Hamagaki7, A. G. Hansen19, H. Hara24, E. P. Hartouni18, R. Hayano38, N. Hayashi31, X. He10, T. K. Hemmick28, J. M. Heuser28, M. Hibino41, J. C. Hill13, D. S. Ho43, K. Homma11, B. Hong15, A. Hoover26, T. Ichihara31,32, K. Imai17,31, M. S. Ippolitov16, M. Ishihara31,32, B. V. Jacak28,32, W. Y. Jang15, J. Jia28, B. M. Johnson3, S. C. Johnson18,28, K. S. Joo23, S. Kametani41, J. H. Kang43, M. Kann30, S. S. Kapoor2, S. Kelly8, B. Khachaturov42, A. Khanzadeev30, J. Kikuchi41, D. J. Kim43, H. J. Kim43, S. Y. Kim43, Y. G. Kim43, W. W. Kinnison19, E. Kistenev3, A. Kiyomichi39, C. Klein-Boesing22, S. Klinksiek25, L. Kochenda30, V. Kochetkov12, D. Koehler25, T. Kohama11, D. Kotchetkov5, A. Kozlov42, P. J. Kroon3, K. Kurita31,32, M. J. Kweon15, Y. Kwon43, G. S. Kyle26, R. Lacey27, J. G. Lajoie13, J. Lauret27, A. Lebedev13,16, D. M. Lee19, M. J. Leitch19, X. H. Li5, Z. Li6,31, D. J. Lim43, M. X. Liu19, X. Liu6, Z. Liu6, C. F. Maguire40, J. Mahon3, Y. I. Makdisi3, V. I. Manko16, Y. Mao6,31, S. K. Mark21, S. Markacs8, G. Martinez34, M. D. Marx28, A. Masaike17, F. Matathias28, T. Matsumoto7,41, P. L. McGaughey19, E. Melnikov12, M. Merschmeyer22, F. Messer28, M. Messer3, Y. Miake39, T. E. Miller40, A. Milov42, S. Mioduszewski3,36, R. E. Mischke19, G. C. Mishra10, J. T. Mitchell3, A. K. Mohanty2, D. P. Morrison3, J. M. Moss19, F. Mühlbacher28, D. Mukhopadhyay42, M. Muniruzzaman5, J. Murata31, S. Nagamiya14, Y. Nagasaka24, J. L. Nagle8, Y. Nakada17, B. K. Nandi5, J. Newby36, L. Nikkinen21, P. Nilsson20, S. Nishimura7, A. S. Nyanin16, J. Nystrand20, E. O’Brien3, C. A. Ogilvie13, H. Ohnishi3,11, I. D. Ojha4,40, M. Ono39, V. Onuchin12, A. Oskarsson20, L. Österman20, I. Otterlund20, K. Oyama7,38, L. Paffrath3,*, D. Pal42, A. P. T. Palounek19, V. S. Pantuev28, V. Papavassiliou26, S. F. Pate26, T. Peitzmann22, A. N. Petridis13, C. Pinkenburg3,27, R. P. Pisani3, P. Pitukhin12, F. Plasil29, M. Pollack28,36, K. Pope36, M. L. Purschke3, I. Ravinovich42, K. F. Read29,36, K. Reygers22, V. Riabov30,35, Y. Riabov30, M. Rosati13, A. A. Rose40, S. S. Ryu43, N. Saito31,32, A. Sakaguchi11, T. Sakaguchi7,41, H. Sako39, T. Sakuma31,37, V. Samsonov30, T. C. Sangster18, R. Santo22, H. D. Sato17,31, S. Sato39, S. Sawada14, B. R. Schlei19, Y. Schutz34, V. Semenov12, R. Seto5, T. K. Shea3, I. Shein12, T. -A. Shibata31,37, K. Shigaki14, T. Shiina19, Y. H. Shin43, I. G. Sibiriak16, D. Silvermyr20, K. S. Sim15, J. Simon-Gillo19, C. P. Singh4, V. Singh4, M. Sivertz3, A. Soldatov12, R. A. Soltz18, S. Sorensen29,36, P. W. Stankus29, N. Starinsky21, P. Steinberg8, E. Stenlund20, A. Ster44, S. P. Stoll3, M. Sugioka31,37, T. Sugitate11, J. P. Sullivan19, Y. Sumi11, Z. Sun6, M. Suzuki39, E. M. Takagui33, A. Taketani31, M. Tamai41, K. H. Tanaka14, Y. Tanaka24, E. Taniguchi31,37, M. J. Tannenbaum3, J. Thomas28, J. H. Thomas18, T. L. Thomas25, W. Tian6,36, J. Tojo17,31, H. Torii17,31, R. S. Towell19, I. Tserruya42, H. Tsuruoka39, A. A. Tsvetkov16, S. K. Tuli4, H. Tydesjö20, N. Tyurin12, T. Ushiroda24, H. W. van Hecke19, C. Velissaris26, J. Velkovska28, M. Velkovsky28, A. A. Vinogradov16, M. A. Volkov16, A. Vorobyov30, E. Vznuzdaev30, H. Wang5, Y. Watanabe31,32, S. N. White3, C. Witzig3, F. K. Wohn13, C. L. Woody3, W. Xie5,42, K. Yagi39, S. Yokkaichi31, G. R. Young29, I. E. Yushmanov16, W. A. Zajc8, Z. Zhang28, S. Zhou6, and S. Zhou42 (PHENIX Collaboration)
1Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
2Bhabha Atomic Research Centre, Bombay 400 085, India
3Brookhaven National Laboratory, Upton, New York 11973-5000
4Department of Physics, Banaras Hindu University, Varanasi 221005, India
5University of California–Riverside, Riverside, California 92521
6China Institute of Atomic Energy (CIAE), Beijing, People’s Republic of China
7Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
8Columbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533
9Florida State University, Tallahassee, Florida 32306
10Georgia State University, Atlanta, Georgia 30303
11Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
12Institute for High Energy Physics (IHEP), Protvino, Russia
13Iowa State University, Ames, Iowa 50011
14KEK, High Energy Accelerator Research Organization, Tsukuba-shi, Ibaraki-ken 305-0801, Japan
15Korea University, Seoul, 136-701, Korea
16Russian Research Center “Kurchatov Institute,” Moscow, Russia
17Kyoto University, Kyoto 606, Japan
18Lawrence Livermore National Laboratory, Livermore, California 94550
19Los Alamos National Laboratory, Los Alamos, New Mexico 87545
20Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden
21McGill University, Montreal, Quebec H3A 2T8, Canada
22Institut für Kernphysik, University of Münster, D-48149 Münster, Germany
23Myongji University, Yongin, Kyonggido 449-728, Korea
24Nagasaki Institute of Applied Science, Nagasaki-shi, Nagasaki 851-0193, Japan
25University of New Mexico, Albuquerque, New Mexico 87131
26New Mexico State University, Las Cruces, New Mexico 88003
27Chemistry Department, State University of New York–Stony Brook, Stony Brook, New York 11794
28Department of Physics and Astronomy, State University of New York–Stony Brook, Stony Brook, New York 11794
29Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
30PNPI, Petersburg Nuclear Physics Institute, Gatchina, Russia
31RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan
32RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000
33Universidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo CEP05315-970, Brazil
34SUBATECH (Ecole des Mines de Nantes, IN2P3/CNRS, Universite de Nantes), BP 20722-44307, Nantes Cedex 3, France
35St. Petersburg State Technical University, St. Petersburg, Russia
36University of Tennessee, Knoxville, Tennessee 37996
37Department of Physics, Tokyo Institute of Technology, Tokyo, 152-8551, Japan
38University of Tokyo, Tokyo, Japan
39Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
40Vanderbilt University, Nashville, Tennessee 37235
41Waseda University, Advanced Research Institute for Science and Engineering, 17 Kikui-cho, Shinjuku-ku, Tokyo 162-0044, Japan
42Weizmann Institute, Rehovot 76100, Israel
43Yonsei University, IPAP, Seoul 120-749, Korea
44KFKI Research Institute for Particle and Nuclear Physics (RMKI), Budapest, Hungary
Received 17 April 2002; published 12 August 2002
We present results on the measurement of Λ and Λ̅ production in Au+Au collisions at √sNN=130 GeV with the PHENIX detector at the Relativistic Heavy Ion Collider. The transverse momentum spectra were measured for minimum bias and for the 5% most central events. The Λ̅ /Λ ratios are constant as a function of pT and the number of participants. The measured net Λ density is significantly larger than predicted by models based on hadronic strings (e.g., HIJING) but in approximate agreement with models which include the gluon-junction mechanism.
© 2002 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.092302
DOI:
10.1103/PhysRevLett.89.092302
*Deceased. †Not a participating institution.
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