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The anisotropy coefficient $v_2$, for unidentified and identified chargedhadrons [pions ($\pi$), kaons ($K$) and protons ($p$)] measured in Au+Aucollisions at $\sqrt{s_{NN}}= 0.20$ TeV (RHIC) and Pb+Pb collisions at$\sqrt{s_{NN}}= 2.76$ TeV (LHC), are compared for several collisioncentralities ($\text{cent}$) and particle transverse momenta $p_T$. In contrastto the measurements for charged hadrons, the comparisons indicate a sizableincrease of $v_2(p_T)$ for $\pi,K$ and $p$, as well as a blueshift of proton$v_2(p_T)$, from RHIC to LHC. When this blueshift is accounted for, the LHCdata [for $\pi$, $K$, $p$] show excellent scaling of $v_2({KE}_T)$ with thenumber of valence quarks ($n_q$), for a broad range of transverse kineticenergies (${KE}_T$) and collision centralities. These observations suggest alarger mean sound speed $<c_s(T)>$ for the plasma created in LHC collisions,and significant radial flow generation after its hadronization.

Does quark number scaling breakdown in Pb+Pb collisions at Root_s = 2.76 TeV?