Skewness of elliptic flow fluctuations
Skewness of elliptic flow fluctuations
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DOI：
10.1103/physrevc.95.014913
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发表时间：
2016-08
影响因子：
3.1
通讯作者：
G. Giacalone;Li Yan;J. Noronha-Hostler;J. Ollitrault
中科院分区：
文献类型：
--
作者：
G. Giacalone;Li Yan;J. Noronha-Hostler;J. Ollitrault
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 and show that hydrodynamics naturally reproduces its magnitude and centrality dependence.
