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K[superscript *0] production in Cu + Cu and Au + Au collisions at √s[subscript NN]=62.4 GeV and 200 GeV

Author(s)
Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross Cameron; Hays-Wehle, James Prewitt; Jones, Christopher LaDon; Kocoloski, Adam Philip; Leight, William Axel; Sakuma, Tai; Seele, Joseph Patrick; Surrow, Bernd; Hoffman, Alan Michael; Milner, Richard G; Redwine, Robert P; van Nieuwenhuizen, Gerrit J; Walker, Matthew H; ... Show more Show less
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Abstract
We report on K[superscript *0] production at midrapidity in Au + Au and Cu + Cu collisions at √s[subscript NN]=62.4 and 200 GeV collected by the Solenoid Tracker at the Relativistic Heavy Ion Collider detector. The K[superscript *0] is reconstructed via the hadronic decays K[superscript *0]→K+π− and K[superscript *0̅] →K[superscript −]π[superscript +]. Transverse momentum, pT, spectra are measured over a range of pT extending from 0.2 GeV/c up to 5 GeV/c. The center-of-mass energy and system size dependence of the rapidity density, dN/dy, and the average transverse momentum, ⟨pT⟩, are presented. The measured N(K[superscript *0])/N(K) and N(φ)/N(K[superscript *0]) ratios favor the dominance of rescattering of decay daughters of K*0 over the hadronic regeneration for the K[superscript *0] production. In the intermediate pT region (2.0<pT<4.0 GeV/c), the elliptic flow parameter, v[subscript 2], and the nuclear modification factor, RCP, agree with the expectations from the quark coalescence model of particle production.
Date issued
2011-09
URI
http://hdl.handle.net/1721.1/71136
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review C
Publisher
American Physical Society
Citation
Aggarwal, M. M. et al. "K*0 production in Cu + Cu and Au + Au collisions at √sNN=62.4 GeV and 200 GeV." Physical Review C 84, 034909 (2011). ©2011 American Physical Society
Version: Final published version
ISSN
0556-2813
1089-490X

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