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Title: Measurement of K 0 S and K *0 in p+p, d+Au, and Cu+Cu collisions at sqrt S NN = 200 GeV

The PHENIX experiment at the Relativistic Heavy Ion Collider has performed a systematic study of K 0 S and K *0 meson production at midrapidity in p+p, d+Au, and Cu+Cu collisions at sqrt S NN = 200 GeV. The K 0 S and K *0 mesons are reconstructed via their K 0 S and π 0(→γγ)π 0 (→γγ) and K *0 → K ± π ± decay modes, respectively. The measured transverse-momentum spectra are used to determine the nuclear modification factor of K 0 S and K *0 mesons in d+Au and Cu+Cu collisions at different centralities. In the d+Au collisions, the nuclear modification factor of K 0 S and K *0 mesons is almost constant as a function of transverse momentum and is consistent with unity showing that cold-nuclear-matter effects do not play a significant role in the measured kinematic range. In Cu+Cu collisions, within the uncertainties no nuclear modification is registered in peripheral collisions. In central collisions, both mesons show suppression relative to the expectations from the p+p yield scaled by the number of binary nucleon-nucleon collisions in the Cu+Cu system. In the p T range 2–5 GeV/c, the strange mesons ( K 0 S, K *0) similarlymore » to the Φ meson with hidden strangeness, show an intermediate suppression between the more suppressed light quark mesons (π 0) and the nonsuppressed baryons (p, p-bar). At higher transverse momentum, p T > 5 GeV/c, production of all particles is similarly suppressed by a factor of ≈2. (auth)« less
 [1] ;  [2]
  1. Univ. of Colorado, Boulder, CO (United States)
  2. Columbia Univ., New York, NY (United States). et al.
Publication Date:
Report Number(s):
Journal ID: ISSN 0556-2813; PRVCAN; KB0201021
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 90; Journal Issue: 5; Journal ID: ISSN 0556-2813
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Brookhaven, NY (United States). Relativistic Heavy Ion Collider
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
PHENIX Collaboration
Country of Publication:
United States
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; measurement; Kos; K*0; p+p; d+Au; Cu+Cu; collisions; relativistic heavy ion collider
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1181612