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Skewness of elliptic flow fluctuations

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arxiv 1608.01823 v3 pith:B42LGDFC submitted 2016-08-05 nucl-th hep-phnucl-ex

classification nucl-thhep-phnucl-ex
keywords fluctuationsskewnessellipticflownegativeskewcalculationscentrality
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

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.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Collective dynamics in heavy and light-ion collisions -- II) Determining the origin of collective behavior in high-energy collisions

    hep-ph 2024-11 conditional novelty 7.0 of 10

    A new observable, W, built from ratios of flow cumulants and transverse energies in same-nucleus collisions at RHIC and LHC, is proposed and validated as a measure of how close a collision system is to hydrodynamic behavior.

  2. Explaining higher-order correlations between elliptic and triangular flow

    nucl-th 2025-11 unverdicted novelty 6.0 of 10

    Mixed harmonic cumulants of elliptic and triangular flow obey simple ratios set by reaction-plane elliptic flow, yielding new predictions for 10-particle cumulants.

  3. Collective dynamics in heavy and light-ion collisions -- I) Kinetic Theory vs. Hydrodynamics

    hep-ph 2024-11 conditional novelty 6.0 of 10

    Event-by-event simulations show elliptic flow in heavy and light ion collisions follows a universal opacity-dependent response curve; hydrodynamics is accurate only above opacity around 3, and oxygen collisions expose...

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