An estimate of QGP viscosity from STAR data on phi mesons

Chaudhuri, A.K.

An estimate of QGP viscosity from STAR data on phi mesons

A.K. Chaudhuri
(
- Calcutta, VECC
)

Jan, 2009

4 pages

e-Print:

0901.0460 [nucl-th]

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Abstract: (arXiv)

In the Israel-Stewart's theory of dissipative hydrodynamics, with a lattice based equation of state, where the confinement-deconfinement transition is a cross-over at

T_{co}

=196 MeV, we have simulated

\phi

meson production in Au+Au collisions at

\sqrt{s}

=200 GeV. STAR data on the centrality dependence of mean

p_T

are explained only in evolution of viscous fluid with viscosity to entropy ratio

\eta/s

=0.25. A host of STAR data, e.g.

\phi

multiplicity, integrated

v_2

, mean

p_T

,

p_T

spectra are consistent with formation of viscous (

\eta/s

=0.25) QGP fluid in central Au+Au collisions, thermalised at

\tau_i

=0.2 fm, and with initial central energy density

\epsilon_i

=5.1

GeV/fm^3

.

47.75.+f
25.75.Ld
25.75.-q
heavy ion: scattering
quark gluon: plasma
fluid: viscosity
Phi(1020): hadroproduction
energy: density
STAR
equation of state

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