cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.150018.v1/t6
title: "Figure 6f" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: $v_2$ for inclusive charged hadrons in Au+Au at $\sqrt{s_{NN}}$ = 200 GeV.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t7
title: "Figure 6g" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: $v_2$ for inclusive charged hadrons in Au+Au at $\sqrt{s_{NN}}$ = 200 GeV.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t9
title: "Figure 7a" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: $v_2$ for inclusive charged hadrons in Au+Au at $\sqrt{s_{NN}}$ = 62.4 GeV.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t10
title: "Figure 7b" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: $v_2$ for inclusive charged hadrons in Au+Au at $\sqrt{s_{NN}}$ = 62.4 GeV.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t11
title: "Figure 8a" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: $v_2$ for inclusive charged hadrons in Cu+Cu at $\sqrt{s_{NN}}$ = 62.4 GeV compared with 200 GeV.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t12
title: "Figure 8b" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: $v_2$ for inclusive charged hadrons in Cu+Cu at $\sqrt{s_{NN}}$ = 62.4 GeV compared with 200 GeV.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t13
title: "Figure 8c" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: $v_2$ for inclusive charged hadrons in Cu+Cu at $\sqrt{s_{NN}}$ = 62.4 GeV compared with 200 GeV.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t14
title: "Figure 9a" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: Comparison of integrated $v_2$ at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV. Au+Au reaction.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t15
title: "Figure 9b" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: Comparison of integrated $v_2$ at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV. Au+Au reaction.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t8
title: "Figure 6h" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: $v_2$ for inclusive charged hadrons in Au+Au at $\sqrt{s_{NN}}$ = 200 GeV.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t16
title: "Figure 10a" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: Comparison of integrated $v_2$ at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV. Cu+Cu reaction.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t17
title: "Figure 10b" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: Comparison of integrated $v_2$ at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV. Cu+Cu reaction.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t18
title: "Figure 11a-1" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: The comparison of integrated $v_2$ as a function of centrality.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t19
title: "Figure 11a-2" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: The comparison of the normalized $v_2$/$\epsilon$ vs. centrality.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.
DOI: 10.17182/hepdata.150018.v1/t20
title: "Figure 11b-1" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: The comparison of integrated $v_2$ as a function of centrality.
description: BNL-RHIC. We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{part}$. We observe that $v_2$ divided by eccentricity (ε) monotonically increases with $N_{part}$ and scales as $N^{1/3}_{part}$. The Cu+Cu data at 62.4 GeV falls below the other scaled $v_2$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy ${KE}_T$ = $m_T$ − $m$ between 0.1 &lt; ${KE}_T$/$n_q$ &lt; 1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of $v_2$/($n_q$⋅ε⋅$N^{1/3}_{part}$) vs. ${KE}_T$/$n_q$ for all measured particles.