Measurements of phi meson production in relativistic heavy-ion collisions at RHIC

Abelev, B.I.; Aggarwal, M.M.; Ahammed, Z.; Anderson, B.D.; Arkhipkin, D.; Averichev, G.S.; Bai, Y.; Balewski, J.; Barannikova, O.; Barnby, L.S.

doi:10.1103/PhysRevC.79.064903

Measurements of phi meson production in relativistic heavy-ion collisions at RHIC

STAR

Collaboration

Sep, 2008

21 pages

Published in:

Phys.Rev.C 79 (2009) 064903

e-Print:

0809.4737 [nucl-ex]

DOI:

10.1103/PhysRevC.79.064903

Experiments:

BNL-RHIC-STAR

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Abstract: (arXiv)

We present results for the measurement of

\phi

meson production via its charged kaon decay channel

\phi \to K^+K^-

in Au+Au collisions at

\sqrt{s_{_{NN}}}=62.4

, 130, 200 GeV, and in p+p and d+Au collisions at

\sqrt{s_{_{NN}}}=200

GeV from the STAR experiment at RHIC. The mid-rapidity (

|y|<0.5

)

\phi

meson spectra in central Au+Au collisions are found to be well described by a single exponential distribution. On the other hand, the spectra from p+p, d+Au and peripheral Au+Au collisions show power-law tails at intermediate and high transverse momenta (

p_{T}

) and are described better by Levy distributions. The constant

\phi/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

\phi

production at RHIC. The

\Omega/\phi

yield ratio as a function of

p_{T}

is consistent with a model based on the recombination of thermal

s

quarks up to

p_{T}\sim 4

GeV/c, but disagrees at higher transverse momenta. The measured nuclear modification factor,

R_{dAu}

, for the

\phi

meson increases above unity at intermediate

p_{T}

, similar to that for pions and protons, while

R_{AA}

is suppressed due to jet quenching in central Au+Au collisions. Number of constituent quark scaling of both

R_{cp}

and

v_{2}

for the

\phi

meson with respect to other hadrons in Au+Au collisions at

\sqrt{s_{_{NN}}}

=200 GeV at intermediate

p_{T}

is observed. These observations support quark coalescence as being the dominant mechanism of hadronization in the intermediate

p_{T}

region at RHIC.

Note:

21 pages, 21 figures, 4 tables

25.75.Dw
p p: interaction
heavy ion: scattering
deuteron
gold
Phi(1020): hadroproduction
Phi(1020): hadronic decay
yield: (Phi(1020) K-)
quark: coalescence
quark: constituent

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