Skewness of elliptic flow fluctuations

Giacalone, Giuliano; Yan, Li; Noronha-Hostler, Jacquelyn; Ollitrault, Jean-Yves

doi:10.1103/physrevc.95.014913

Cited by 62 publications

(91 citation statements)

References 47 publications

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“…The Elliptic Power distribution, proposed in [26,27], was motivated mainly by this observation and it was shown to provide a good description of P (v 2 ) in a wide centrality range [32]. Moreover, γ 1 has been predicted to increase in absolute value from central to peripheral collisions [30], being roughly proportional to v 2 {RP} and being inversely proportional to the square root of the system size [28]. γ 1 can be estimated from the fine-splitting among two-and multi-particle cumulants [30] …”

Section: Jhep07(2018)103mentioning

confidence: 99%

“…(1.2), although the two have been estimated to coincide within a few percents [30]. The derivation of eq.…”

Section: Jhep07(2018)103mentioning

confidence: 99%

“…(1.7) relies on a Taylor expansion of the generating function in powers of the moments, truncated at the order of the skewness. It is experimentally possible to test the validity of this approximation through the universal equality that it implies [30,33] …”

Section: Jhep07(2018)103mentioning

confidence: 99%

“…Moreover, γ 1 has been predicted to increase in absolute value from central to peripheral collisions [30], being roughly proportional to v 2 {RP} and being inversely proportional to the square root of the system size [28]. γ 1 can be estimated from the fine-splitting among two-and multi-particle cumulants [30] …”

Section: Jhep07(2018)103mentioning

confidence: 99%

“…Its quantitative determination would therefore improve the characterization of these deviations. For dimensional reasons, it is convenient to use a standardised skewness (γ 1 ), defined as [30] …”

Section: Jhep07(2018)103mentioning

confidence: 99%

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Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ and 2.76 TeV

Acharya

Acosta

Adamová

et al. 2018

J. High Energ. Phys.

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Measurements of anisotropic flow coefficients with two-and multi-particle cumulants for inclusive charged particles in Pb-Pb collisions at √ s NN = 5.02 and 2.76 TeV are reported in the pseudorapidity range |η| < 0.8 and transverse momentum 0.2 < p T < 50 GeV/c. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) µb −1 in the centrality range 0-80%, is analysed. Flow coefficients up to the sixth flow harmonic (v 6 ) are reported and a detailed comparison among results at the two energies is carried out. The p T dependence of anisotropic flow coefficients and its evolution with respect to centrality and harmonic number n are investigated. An approximate power-law scaling of the form v n (p T ) ∼ p n/3 T is observed for all flow harmonics at low p T (0.2 < p T < 3 GeV/c). At the same time, the ratios v n /v n/m m are observed to be essentially independent of p T for most centralities up to about p T = 10 GeV/c. Analysing the differences among higher-order cumulants of elliptic flow (v 2 ), which have different sensitivities to flow fluctuations, a measurement of the standardised skewness of the event-by-event v 2 distribution P (v 2 ) is reported and constraints on its higher moments are provided. The Elliptic Power distribution is used to parametrise P (v 2 ), extracting its parameters from fits to cumulants. The measurements are compared to different model predictions in order to discriminate among initial-state models and to constrain the temperature dependence of the shear viscosity to entropy-density ratio.

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Section: Jhep07(2018)103mentioning

confidence: 99%

“…(1.2), although the two have been estimated to coincide within a few percents [30]. The derivation of eq.…”

Section: Jhep07(2018)103mentioning

confidence: 99%

Section: Jhep07(2018)103mentioning

confidence: 99%

Section: Jhep07(2018)103mentioning

confidence: 99%

Section: Jhep07(2018)103mentioning

confidence: 99%

See 3 more Smart Citations

Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ and 2.76 TeV

Acharya

Acosta

Adamová

et al. 2018

J. High Energ. Phys.

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Elliptic Flow in Relativistic Heavy-Ion Collisions

Aggarwal

2020

Springer Proceedings in Physics

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Higher-order moments of the elliptic flow distribution in PbPb collisions at $$ \sqrt{s_{\textrm{NN}}} $$ = 5.02 TeV

Tumasyan,

Adam,

Andrejkovic

et al. 2024

J. High Energ. Phys.

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The hydrodynamic flow-like behavior of charged hadrons in high-energy lead-lead collisions is studied through multiparticle correlations. The elliptic anisotropy values based on different orders of multiparticle cumulants, v2{2k}, are measured up to the tenth order (k = 5) as functions of the collision centrality at a nucleon-nucleon center-of-mass energy of $$ \sqrt{s_{\textrm{NN}}} $$ s NN = 5.02 TeV. The data were recorded by the CMS experiment at the LHC and correspond to an integrated luminosity of 0.607 nb−1. A hierarchy is observed between the coefficients, with v2{2} > v2{4} ≳ v2{6} ≳ v2{8} ≳ v2{10}. Based on these results, centrality-dependent moments for the fluctuation-driven event-by-event v2 distribution are determined, including the skewness, kurtosis and, for the first time, superskewness. Assuming a hydrodynamic expansion of the produced medium, these moments directly probe the initial-state geometry in high-energy nucleus-nucleus collisions.

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Skewness of elliptic flow fluctuations

Cited by 62 publications

References 47 publications

Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ and 2.76 TeV

Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ and 2.76 TeV

Elliptic Flow in Relativistic Heavy-Ion Collisions

Higher-order moments of the elliptic flow distribution in PbPb collisions at $$ \sqrt{s_{\textrm{NN}}} $$ = 5.02 TeV

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