Measurements of {phi} meson production in relativistic heavy-ion collisions at the BNL relativistic heavy ion collider (RHIC).

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Phys. Rev. C

DOI:https://doi.org/10.1103/PhysRevC.79.064903· OSTI ID:963278

Abelev, B I; Aggarwal, M M; Ahammed, Z; Anderson, B D; Arkhipkin, D; Krueger, K; Spinka, H; Underwood, D G

We present results for the measurement of {phi} meson production via its charged kaon decay channel {phi} {yields} K{sup +}K{sup -} in Au+Au collisions at {radical}S{sub NN} = 62.4, 130, and 200 GeV, and in p+p and d+Au collisions at {radical}s{sub NN} = 200 GeV from the STAR experiment at the BNL Relativistic Heavy Ion Collider (RHIC). The midrapidity (|y| < 0.5) {phi} meson transverse momentum (p{sub T}) spectra in central Au+Au collisions are found to be well described by a single exponential distribution. On the other hand, the p{sub T} spectra from p+p, d+Au, and peripheral Au+Au collisions show power-law tails at intermediate and high p{sub T} and are described better by Levy distributions. The constant {phi}/K{sup -} 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 {phi} production at RHIC. The {Omega}/{phi} yield ratio as a function of p{sub T} is consistent with a model based on the recombination of thermal s quarks up to p{sub T} {approx} 4 GeV/c, but disagrees at higher transverse momenta. The measured nuclear modification factor, R{sub dAu}, for the {phi} meson increases above unity at intermediate p{sub T}, similar to that for pions and protons, while R{sub AA} is suppressed due to the energy loss effect in central Au+Au collisions. Number of constituent quark scaling of both R{sub cp} and v{sub 2} for the {phi} meson with respect to other hadrons in Au+Au collisions at {radical}s{sub NN} = 200 GeV at intermediate p{sub T} is observed. These observations support quark coalescence as being the dominant mechanism of hadronization in the intermediate p{sub T} region at RHIC.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NSF; Sloan Foundation; Government of India; Swiss NSF; Polish State Committee for Scientific Research; Korea Science and Engineering Foundation
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 963278
• Report Number(s): ANL-HEP-PR-09-73
• Journal Information: Phys. Rev. C, Journal Name: Phys. Rev. C Journal Issue: 2009 Vol. 79; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
74 ATOMIC AND MOLECULAR PHYSICS
BNL
COALESCENCE
DECAY
HADRONS
HEAVY IONS
KAONS
MESONS
MODIFICATIONS
PIONS
PRODUCTION
PROTONS
QUARKS
RECOMBINATION
S QUARKS
SPECTRA
TRANSVERSE MOMENTUM