Abstract
Using event-by-event hydrodynamic calculations, we find that the fluctuations of the elliptic flow in the reaction plane have a negative skew. We compare the skewness of 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 observed in Pb+Pb collisions at the CERN Large Hadron Collider. We describe how the skewness can be measured experimentally and show that hydrodynamics naturally reproduces its magnitude and centrality dependence.
- Received 11 August 2016
DOI:https://doi.org/10.1103/PhysRevC.95.014913
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