Scalings of Elliptic Flow for a Fluid at Finite Shear Viscosity

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dc.creatorFerini, G.
dc.creatorColonna, M.
dc.creatorDi Toro, M.
dc.creatorGreco, V.
dc.date2008-05-30
dc.date2008-06-27
dc.date.accessioned2026-07-07T12:30:06Z
dc.date.available2026-07-07T12:30:06Z
dc.descriptionWithin a parton cascade approach we investigate the scaling of the differential elliptic flow $v_2(p_T)$ with eccentricity $ε_x$ and system size and its sensitivity to finite shear viscosity. We present calculations for shear viscosity to entropy density ratio $η/s$ in the range from $1/4π$ up to $1/π$, finding that the $v_2$ saturation value varies by about a factor 2. Scaling of $v_2(p_T)/ε_x$ is seen also for finite $η/s$ which indicates that it does not prove a perfect hydrodynamical behavior, but is compatible with a plasma at finite $η/s$. Introducing a suitable freeze-out condition, we see a significant reduction of $v_2(p_T)$ especially at intermediate $p_T$ and for more peripheral collisions. This causes a breaking of the scaling for both $v_2(p_T)$ and the $p_T-$averaged $v_2$, while keeping the scaling of $v_2(p_T)/\la v_2\ra$. This is in better agreement with the experimental observations and shows as a first indication that the $η/s$ should be significantly lower than the pQCD estimates. We finally point out the necessity to include the hadronization via coalescence for a definite evaluation of $η/s$ from intermediate $p_T$ data.
dc.description5 pages, 5 figures. Two points in fig.4 has been changed
dc.identifierhttps://arxiv.org/abs/0805.4814
dc.identifierhttp://arxiv.org/abs/0805.4814
dc.identifierPhys.Lett.B670:325-329,2009
dc.identifierdoi:10.1016/j.physletb.2008.10.062
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/216042
dc.subjectNuclear Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.titleScalings of Elliptic Flow for a Fluid at Finite Shear Viscosity
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