Skewness of elliptic flow fluctuations

Giuliano Giacalone, Li Yan, Jacquelyn Noronha-Hostler, Jean-Yves Ollitrault
2017 Physical Review C  
Using event-by-event hydrodynamic calculations, we find that the fluctuations of the elliptic flow (v_2) in the reaction plane have a negative skew. We compare the skewness of v_2 fluctuations to that of initial eccentricity fluctuations. We show that skewness is the main effect lifting the degeneracy between higher-order cumulants, with negative skew corresponding to the hierarchy v_2{4}>v_2{6} observed in Pb+Pb collisions at the LHC. We describe how the skewness can be measured experimentally
more » ... and show that hydrodynamics naturally reproduces its magnitude and centrality dependence.
doi:10.1103/physrevc.95.014913 fatcat:t25bg2uggzczxn26fz4funeiye