Speaker
Naghmeh Mohammadi
(Nikhef National institute for subatomic physics (NL))
Description
Anisotropic flow plays a critical role in establishing the equation of state for the Quark Gluon Plasma. The results at the LHC have demonstrated that the matter created in heavy-ion collisions behaves as a nearly perfect fluid reflected in the low value of the shear viscosity over entropy density ratio ($\eta$/s). The higher flow harmonics are particularly sensitive to the value of $\eta$/s in hydrodynamic calculations. In this talk, we present the first ALICE results on $p_{\rm T}$ differential $v_{2}$, $v_{3}$, $v_{4}$ and $v_{5}$ for π$^{\pm}$, K$^\pm$, $\mathrm{p}$($\overline{\mathrm{p}}$) from the high statistics 2011 heavy-ion run. We investigate how all $v_{n}$ coefficients evolve with particle mass and centrality for 0-1%, 20-30% and 40-50% centrality percentiles. These new measurements aim at differentiating between models that use different initial conditions, constraining further the value of $\eta$/s and allowing to decouple the influence of the late hadronic stage from the hydrodynamic evolution of the system.
| On behalf of collaboration: | ALICE |
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Author
Naghmeh Mohammadi
(Nikhef National institute for subatomic physics (NL))
