Phys. Rev. C 79, 064903 (2009) [20 pages]
Measurements of  meson production in relativistic heavy-ion collisions at the BNL Relativistic Heavy Ion Collider (RHIC)
Abstract
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(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
8Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
9University of Illinois at Chicago, Chicago, Illinois 60607, USA
10Creighton University, Omaha, Nebraska 68178, USA
11Nuclear Physics Institute AS CR, CZ-25068 Řež/Prague, Czech Republic
12Laboratory for High Energy (JINR), Dubna, Russia
13Particle Physics Laboratory (JINR), Dubna, Russia
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
20University of Kentucky, Lexington, Kentucky, 40506-0055, USA
21Institute of Modern Physics, Lanzhou, People's Republic of China
22Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
23Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
24Max-Planck-Institut für Physik, Munich, Germany
25Michigan State University, East Lansing, Michigan 48824, USA
26Moscow Engineering Physics Institute, Moscow, Russia
27City College of New York, New York City, New York 10031, USA
28NIKHEF and Utrecht University, Amsterdam, The Netherlands
29Ohio State University, Columbus, Ohio 43210, 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
39Shanghai Institute of Applied Physics, Shanghai 201800, People's Republic of China
40SUBATECH, Nantes, France
41Texas A&M University, College Station, Texas 77843, USA
42University of Texas, Austin, Texas 78712, USA
43Tsinghua University, Beijing 100084, People's Republic of China
44United States Naval Academy, Annapolis, Maryland 21402, USA
45Valparaiso University, Valparaiso, Indiana 46383, USA
46Variable Energy Cyclotron Centre, Kolkata 700064, India
47Warsaw University of Technology, Warsaw, Poland
48University of Washington, Seattle, Washington 98195, USA
49Wayne State University, Detroit, Michigan 48201, USA
50Institute of Particle Physics, CCNU (HZNU), Wuhan 430079, People's Republic of China
51Yale University, New Haven, Connecticut 06520, USA
52University of Zagreb, Zagreb, HR-10002, Croatia
Received 17 September 2008; published 15 June 2009
We present results for the measurement of meson production via its charged kaon decay channel  K+K- in Au+Au collisions at ![sqrt(s[sub NN])](http://scitation.aip.org/servlet/GetImg?key=PRVCAN000079000006064903000001%3A0%3A0%3A28&t=a&d=a) =62.4,130, and 200 GeV, and in p+p and d+Au collisions at =200 GeV from the STAR experiment at the BNL Relativistic Heavy Ion Collider (RHIC). The midrapidity (|y|<0.5) meson transverse momentum (pT) spectra in central Au+Au collisions are found to be well described by a single exponential distribution. On the other hand, the pT spectra from p+p, d+Au, and peripheral Au+Au collisions show power-law tails at intermediate and high pT and are described better by Levy distributions. The constant /K- yield ratio vs beam species, collision centrality, and colliding energy is in contradiction with expectations from models having kaon coalescence as the dominant mechanism for production at RHIC. The  / yield ratio as a function of pT is consistent with a model based on the recombination of thermal s quarks up to pT~4 GeV/c, but disagrees at higher transverse momenta. The measured nuclear modification factor, RdAu, for the meson increases above unity at intermediate pT, similar to that for pions and protons, while RAA is suppressed due to the energy loss effect in central Au+Au collisions. Number of constituent quark scaling of both Rcp and v2 for the meson with respect to other hadrons in Au+Au collisions at =200 GeV at intermediate pT is observed. These observations support quark coalescence as being the dominant mechanism of hadronization in the intermediate pT region at RHIC.
©2009 The American Physical Society
| URL: |
http://link.aps.org/doi/10.1103/PhysRevC.79.064903
|
| DOI: |
10.1103/PhysRevC.79.064903 |
| PACS: |
25.75.Dw
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