Measurement of K0S and K*0 in p+p, d+Au, and Cu+Cu collisions at sqrt SNN = 200 GeV

Adare, A.; Aidala, C.

doi:10.1103/PhysRevC.90.054905

Title: Measurement of K⁰_S and K^*0 in p+p, d+Au, and Cu+Cu collisions at sqrt S_NN = 200 GeV

Journal Article · Sat Nov 01 04:00:00 UTC 2014 · Physical Review C, Nuclear Physics

DOI: https://doi.org/10.1103/PhysRevC.90.054905 · OSTI ID:1159734

Adare, A. ^[1]; Aidala, C. ^[2]

Univ. of Colorado, Boulder, CO (United States)
Columbia Univ., New York, NY (United States). et al.

The PHENIX experiment at the Relativistic Heavy Ion Collider has performed a systematic study of K⁰_S and K^*0 meson production at midrapidity in p+p, d+Au, and Cu+Cu collisions at sqrt S_NN = 200 GeV. The K⁰_S and K^*0 mesons are reconstructed via their K⁰_S and π⁰(→γγ)π⁰ (→γγ) and K^*0 → K ^±π^± decay modes, respectively. The measured transverse-momentum spectra are used to determine the nuclear modification factor of K⁰_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 K⁰_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 ( K⁰_S, K^*0) similarly to the Φ meson with hidden strangeness, show an intermediate suppression between the more suppressed light quark mesons (π⁰) 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)

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Research Organization:: Brookhaven National Laboratory (BNL), Brookhaven, NY (United States). Relativistic Heavy Ion Collider

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: PHENIX Collaboration

Grant/Contract Number:: AC02-98CH10886

OSTI ID:: 1159734

Report Number(s):: BNL--106189-2014-JA; KB0201021

Journal Information:: Physical Review C, Nuclear Physics, Journal Name: Physical Review C, Nuclear Physics Journal Issue: 5 Vol. 90; ISSN 0556-2813; ISSN PRVCAN

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Measurement of K⁰_S and K^*0 in p+p, d+Au, and Cu+Cu collisions at sqrt S_NN = 200 GeV