cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.150018.v1/t50
title: "Figure 16b-2" 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 the $v_2$ of particles, antiparticles, for a minimum bias sample at 200 GeV and central 62.4 GeV Au+Au collisions.
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/t51
title: "Figure 16b-3" 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 the $v_2$ of particles, antiparticles, for a minimum bias sample at 200 GeV and central 62.4 GeV Au+Au collisions.
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/t52
title: "Figure 17a" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: The ratio $v_2$/$n_q$ vs. $p_T$/$n_q$ for $\pi$/$K$/$p$ emitted from Au+Au at 62.4 and 200 GeV and Cu+Cu at 200 GeV collisions.
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/t53
title: "Figure 17b" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: The ratio $v_2$/$n_q$ vs. $p_T$/$n_q$ for $\pi$/$K$/$p$ emitted from Au+Au at 62.4 and 200 GeV and Cu+Cu at 200 GeV collisions.
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/t54
title: "Figure 17c" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: The ratio $v_2$/$n_q$ vs. $p_T$/$n_q$ for $\pi$/$K$/$p$ emitted from Au+Au at 62.4 and 200 GeV and Cu+Cu at 200 GeV collisions.
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/t55
title: "Figure 17d" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: The ratio $v_2$/$n_q$ vs. $p_T$/$n_q$ for $\pi$/$K$/$p$ emitted from Au+Au at 62.4 and 200 GeV and Cu+Cu at 200 GeV collisions.
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/t56
title: "Figure 17e" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: The ratio $v_2$/$n_q$ vs. $p_T$/$n_q$ for $\pi$/$K$/$p$ emitted from Au+Au at 62.4 and 200 GeV and Cu+Cu at 200 GeV collisions.
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/t57
title: "Figure 17f-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 ratio $v_2$/$n_q$ vs. $p_T$/$n_q$ for $\pi$/$K$/$p$ emitted from Au+Au at 62.4 and 200 GeV and Cu+Cu at 200 GeV collisions.
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/t58
title: "Figure 17f-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 ratio $v_2$/$n_q$ vs. $p_T$/$n_q$ for $\pi$/$K$/$p$ emitted from Au+Au at 62.4 and 200 GeV and Cu+Cu at 200 GeV collisions.
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/t59
title: "Figure 17g" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: The ratio $v_2$/$n_q$ vs. $p_T$/$n_q$ for $\pi$/$K$/$p$ emitted from Au+Au at 62.4 and 200 GeV and Cu+Cu at 200 GeV collisions.
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/t60
title: "Figure 17h" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: The ratio $v_2$/$n_q$ vs. $p_T$/$n_q$ for $\pi$/$K$/$p$ emitted from Au+Au at 62.4 and 200 GeV and Cu+Cu at 200 GeV collisions.
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/t61
title: "Figure 17i" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: The ratio $v_2$/$n_q$ vs. $p_T$/$n_q$ for $\pi$/$K$/$p$ emitted from Au+Au at 62.4 and 200 GeV and Cu+Cu at 200 GeV collisions.
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/t62
title: "Figure 18a" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: The ratio $v_2$/$n_q$ vs. ${KE}_T$/$n_q$ for $\pi$/$K$/$p$ emitted from Au+Au at 62.4 and 200 GeV and Cu+Cu at 200 GeV collisions.
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/t63
title: "Figure 18b" of "Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200 GeV"

description: The ratio $v_2$/$n_q$ vs. ${KE}_T$/$n_q$ for $\pi$/$K$/$p$ emitted from Au+Au at 62.4 and 200 GeV and Cu+Cu at 200 GeV collisions.
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.