Blast-wave description of ${\rm Y}$ elliptic flow at energies available at the CERN Large Hadron Collider

Abstract

A simultaneous blast-wave fit to particle yields and elliptic flow ($v_2$) measured as a function of transverse momentum in Pb-Pb collisions at LHC energies is presented. A compact formula for the calculation of $v_2(p_T)$ for an elliptic freeze-out surface is used which follows from the Cooper-Frye ansatz without further assumptions. Over the full available $p_T$ range, the ${\rm Y}$ elliptic flow data is described by the prediction based on the fit to lighter particles. This prediction shows that, due to the large ${\rm Y}$ mass, a sizable elliptic flow is only expected at transverse momenta above 10 GeV/$c$.

Comments: 9 pages, 5 figures, published version