cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.83737.v1/t134
title: "Table 134" of "Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $\mathbf{\sqrt{{\textit s}_\text{NN}}} = \mathbf{5.02}$ and $\mathbf{2.76}$ TeV"

description: $v_3\{2,|\Delta\eta| &gt; 2.\}$ for Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV and centrality 60-70$\%$ as a function of $p_\text{T}$.
description: Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV are reported in the pseudorapidity range $|\eta| &lt; 0.8$ and transverse momentum $0.2 &lt; p_\text{T} &lt; 50$ GeV/$c$. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) $\mu$b$^{-1}$ 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 $p_\text{T}$ 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 $v_n(p_\text{T}) \sim p_\text{T}^{n/3}$ is observed for all flow harmonics at low $p_\text{T}$ ($0.2 &lt; p_\text{T} &lt; 3$ GeV/$c$). At the same time, the ratios $v_n/v_m^{n/m}$ are observed to be essentially independent of $p_\text{T}$ for most centralities up to about $p_\text{T} = 10$ 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.
DOI: 10.17182/hepdata.83737.v1/t135
title: "Table 135" of "Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $\mathbf{\sqrt{{\textit s}_\text{NN}}} = \mathbf{5.02}$ and $\mathbf{2.76}$ TeV"

description: $v_4\{2,|\Delta\eta| &gt; 2.\}$ for Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV and centrality 60-70$\%$ as a function of $p_\text{T}$.
description: Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV are reported in the pseudorapidity range $|\eta| &lt; 0.8$ and transverse momentum $0.2 &lt; p_\text{T} &lt; 50$ GeV/$c$. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) $\mu$b$^{-1}$ 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 $p_\text{T}$ 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 $v_n(p_\text{T}) \sim p_\text{T}^{n/3}$ is observed for all flow harmonics at low $p_\text{T}$ ($0.2 &lt; p_\text{T} &lt; 3$ GeV/$c$). At the same time, the ratios $v_n/v_m^{n/m}$ are observed to be essentially independent of $p_\text{T}$ for most centralities up to about $p_\text{T} = 10$ 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.
DOI: 10.17182/hepdata.83737.v1/t136
title: "Table 137" of "Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $\mathbf{\sqrt{{\textit s}_\text{NN}}} = \mathbf{5.02}$ and $\mathbf{2.76}$ TeV"

description: ratio of $v_2\{2,|\Delta\eta| &gt; 1.\}$ at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV and centrality 5-10$\%$ as a function of $p_\text{T}$.
description: Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV are reported in the pseudorapidity range $|\eta| &lt; 0.8$ and transverse momentum $0.2 &lt; p_\text{T} &lt; 50$ GeV/$c$. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) $\mu$b$^{-1}$ 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 $p_\text{T}$ 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 $v_n(p_\text{T}) \sim p_\text{T}^{n/3}$ is observed for all flow harmonics at low $p_\text{T}$ ($0.2 &lt; p_\text{T} &lt; 3$ GeV/$c$). At the same time, the ratios $v_n/v_m^{n/m}$ are observed to be essentially independent of $p_\text{T}$ for most centralities up to about $p_\text{T} = 10$ 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.
DOI: 10.17182/hepdata.83737.v1/t137
title: "Table 138" of "Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $\mathbf{\sqrt{{\textit s}_\text{NN}}} = \mathbf{5.02}$ and $\mathbf{2.76}$ TeV"

description: ratio of $v_3\{2,|\Delta\eta| &gt; 1.\}$ at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV and centrality 5-10$\%$ as a function of $p_\text{T}$.
description: Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV are reported in the pseudorapidity range $|\eta| &lt; 0.8$ and transverse momentum $0.2 &lt; p_\text{T} &lt; 50$ GeV/$c$. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) $\mu$b$^{-1}$ 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 $p_\text{T}$ 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 $v_n(p_\text{T}) \sim p_\text{T}^{n/3}$ is observed for all flow harmonics at low $p_\text{T}$ ($0.2 &lt; p_\text{T} &lt; 3$ GeV/$c$). At the same time, the ratios $v_n/v_m^{n/m}$ are observed to be essentially independent of $p_\text{T}$ for most centralities up to about $p_\text{T} = 10$ 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.
DOI: 10.17182/hepdata.83737.v1/t138
title: "Table 139" of "Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $\mathbf{\sqrt{{\textit s}_\text{NN}}} = \mathbf{5.02}$ and $\mathbf{2.76}$ TeV"

description: ratio of $v_4\{2,|\Delta\eta| &gt; 1.\}$ at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV and centrality 5-10$\%$ as a function of $p_\text{T}$.
description: Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV are reported in the pseudorapidity range $|\eta| &lt; 0.8$ and transverse momentum $0.2 &lt; p_\text{T} &lt; 50$ GeV/$c$. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) $\mu$b$^{-1}$ 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 $p_\text{T}$ 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 $v_n(p_\text{T}) \sim p_\text{T}^{n/3}$ is observed for all flow harmonics at low $p_\text{T}$ ($0.2 &lt; p_\text{T} &lt; 3$ GeV/$c$). At the same time, the ratios $v_n/v_m^{n/m}$ are observed to be essentially independent of $p_\text{T}$ for most centralities up to about $p_\text{T} = 10$ 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.
DOI: 10.17182/hepdata.83737.v1/t139
title: "Table 140" of "Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $\mathbf{\sqrt{{\textit s}_\text{NN}}} = \mathbf{5.02}$ and $\mathbf{2.76}$ TeV"

description: ratio of $v_2\{2,|\Delta\eta| &gt; 1.\}$ at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV and centrality 20-30$\%$ as a function of $p_\text{T}$.
description: Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV are reported in the pseudorapidity range $|\eta| &lt; 0.8$ and transverse momentum $0.2 &lt; p_\text{T} &lt; 50$ GeV/$c$. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) $\mu$b$^{-1}$ 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 $p_\text{T}$ 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 $v_n(p_\text{T}) \sim p_\text{T}^{n/3}$ is observed for all flow harmonics at low $p_\text{T}$ ($0.2 &lt; p_\text{T} &lt; 3$ GeV/$c$). At the same time, the ratios $v_n/v_m^{n/m}$ are observed to be essentially independent of $p_\text{T}$ for most centralities up to about $p_\text{T} = 10$ 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.
DOI: 10.17182/hepdata.83737.v1/t140
title: "Table 141" of "Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $\mathbf{\sqrt{{\textit s}_\text{NN}}} = \mathbf{5.02}$ and $\mathbf{2.76}$ TeV"

description: ratio of $v_3\{2,|\Delta\eta| &gt; 1.\}$ at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV and centrality 20-30$\%$ as a function of $p_\text{T}$.
description: Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV are reported in the pseudorapidity range $|\eta| &lt; 0.8$ and transverse momentum $0.2 &lt; p_\text{T} &lt; 50$ GeV/$c$. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) $\mu$b$^{-1}$ 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 $p_\text{T}$ 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 $v_n(p_\text{T}) \sim p_\text{T}^{n/3}$ is observed for all flow harmonics at low $p_\text{T}$ ($0.2 &lt; p_\text{T} &lt; 3$ GeV/$c$). At the same time, the ratios $v_n/v_m^{n/m}$ are observed to be essentially independent of $p_\text{T}$ for most centralities up to about $p_\text{T} = 10$ 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.
DOI: 10.17182/hepdata.83737.v1/t141
title: "Table 142" of "Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $\mathbf{\sqrt{{\textit s}_\text{NN}}} = \mathbf{5.02}$ and $\mathbf{2.76}$ TeV"

description: ratio of $v_4\{2,|\Delta\eta| &gt; 1.\}$ at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV and centrality 20-30$\%$ as a function of $p_\text{T}$.
description: Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV are reported in the pseudorapidity range $|\eta| &lt; 0.8$ and transverse momentum $0.2 &lt; p_\text{T} &lt; 50$ GeV/$c$. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) $\mu$b$^{-1}$ 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 $p_\text{T}$ 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 $v_n(p_\text{T}) \sim p_\text{T}^{n/3}$ is observed for all flow harmonics at low $p_\text{T}$ ($0.2 &lt; p_\text{T} &lt; 3$ GeV/$c$). At the same time, the ratios $v_n/v_m^{n/m}$ are observed to be essentially independent of $p_\text{T}$ for most centralities up to about $p_\text{T} = 10$ 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.
DOI: 10.17182/hepdata.83737.v1/t142
title: "Table 143" of "Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $\mathbf{\sqrt{{\textit s}_\text{NN}}} = \mathbf{5.02}$ and $\mathbf{2.76}$ TeV"

description: ratio of $v_2\{2,|\Delta\eta| &gt; 1.\}$ at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV and centrality 40-50$\%$ as a function of $p_\text{T}$.
description: Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV are reported in the pseudorapidity range $|\eta| &lt; 0.8$ and transverse momentum $0.2 &lt; p_\text{T} &lt; 50$ GeV/$c$. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) $\mu$b$^{-1}$ 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 $p_\text{T}$ 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 $v_n(p_\text{T}) \sim p_\text{T}^{n/3}$ is observed for all flow harmonics at low $p_\text{T}$ ($0.2 &lt; p_\text{T} &lt; 3$ GeV/$c$). At the same time, the ratios $v_n/v_m^{n/m}$ are observed to be essentially independent of $p_\text{T}$ for most centralities up to about $p_\text{T} = 10$ 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.
DOI: 10.17182/hepdata.83737.v1/t143
title: "Table 144" of "Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $\mathbf{\sqrt{{\textit s}_\text{NN}}} = \mathbf{5.02}$ and $\mathbf{2.76}$ TeV"

description: ratio of $v_3\{2,|\Delta\eta| &gt; 1.\}$ at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV and centrality 40-50$\%$ as a function of $p_\text{T}$.
description: Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV are reported in the pseudorapidity range $|\eta| &lt; 0.8$ and transverse momentum $0.2 &lt; p_\text{T} &lt; 50$ GeV/$c$. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) $\mu$b$^{-1}$ 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 $p_\text{T}$ 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 $v_n(p_\text{T}) \sim p_\text{T}^{n/3}$ is observed for all flow harmonics at low $p_\text{T}$ ($0.2 &lt; p_\text{T} &lt; 3$ GeV/$c$). At the same time, the ratios $v_n/v_m^{n/m}$ are observed to be essentially independent of $p_\text{T}$ for most centralities up to about $p_\text{T} = 10$ 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.
DOI: 10.17182/hepdata.83737.v1/t144
title: "Table 145" of "Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $\mathbf{\sqrt{{\textit s}_\text{NN}}} = \mathbf{5.02}$ and $\mathbf{2.76}$ TeV"

description: ratio of $v_4\{2,|\Delta\eta| &gt; 1.\}$ at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV and centrality 40-50$\%$ as a function of $p_\text{T}$.
description: Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ and 2.76 TeV are reported in the pseudorapidity range $|\eta| &lt; 0.8$ and transverse momentum $0.2 &lt; p_\text{T} &lt; 50$ GeV/$c$. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) $\mu$b$^{-1}$ 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 $p_\text{T}$ 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 $v_n(p_\text{T}) \sim p_\text{T}^{n/3}$ is observed for all flow harmonics at low $p_\text{T}$ ($0.2 &lt; p_\text{T} &lt; 3$ GeV/$c$). At the same time, the ratios $v_n/v_m^{n/m}$ are observed to be essentially independent of $p_\text{T}$ for most centralities up to about $p_\text{T} = 10$ 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.