An estimate of QGP viscosity from STAR data on $ϕ$ mesons

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dc.creatorChaudhuri, A. K.
dc.date2009-01-05
dc.date2009-03-20
dc.date.accessioned2026-07-07T12:54:11Z
dc.date.available2026-07-07T12:54:11Z
dc.descriptionIn 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 analysed the STAR data on $ϕ$ meson production in Au+Au collisions at $\sqrt{s}$=200 GeV. From a simultaneous fit to $ϕ$ mesons multiplicity, mean $p_T$ and integrated $v_2$, we obtain a phenomenological estimate of QGP viscosity, $η/s =0.15 \pm 0.05 \pm 0.03$, the first error is due to the experimental uncertainty in STAR measurements, the second reflects the uncertainties in initial and final conditions of the fluid. A host of STAR data, e.g. $ϕ$ multiplicity, integrated $v_2$, mean $p_T$, $p_T$ spectra ($p_T <$3 GeV), in central Au+Au collisions, are consistent with the estimate of viscosity.
dc.description5 pages, 4 figures. Extensively revised version. QGP viscosity is determined as, $η/s$=0.15 \pm 0.05 \pm 0.03, the first error reflect the uncertainty in STAR measurements, the 2nd is due to uncertainty in initial and final condition of the fluid
dc.identifierhttps://arxiv.org/abs/0901.0460
dc.identifierhttp://arxiv.org/abs/0901.0460
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/223843
dc.subjectNuclear Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.titleAn estimate of QGP viscosity from STAR data on $ϕ$ mesons
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