cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.143112.v1/t6
title: "Figure 6a" of "J/psi suppression at forward rapidity in Au+Au collisions at sqrt(s_NN)=39 and 62.4 GeV"

description: $J/\psi$ $R_{AA}$ at $\sqrt{s_{NN}}$ = 39 and 62.4 GeV. Type A errors are point-to-point uncorrelated, Type B errors are point-to-point correlated, and Type C are global systematic from the uncertainty in the peripheral $$ value.
description: We present measurements of the $J/\psi$ invariant yields in $\sqrt{s_{NN}}$ = 39 and 62.4 GeV Au+Au collisions at forward rapidity (1.2 &lt; $|y|$ &lt; 2.2). Invariant yields are presented as a function of both collision centrality and transverse momentum. Nuclear modifications are obtained for central relative to peripheral Au+Au collisions ($R_{CP}$) and for various centrality selections in Au+Au relative to scaled $p$+$p$ cross sections obtained from other measurements ($R_{AA}$). The observed suppression patterns at 39 and 62.4 GeV are quite similar to those previously measured at 200 GeV. This similar suppression presents a challenge to theoretical models that contain various competing mechanisms with different energy dependencies, some of which cause suppression and others enhancement.
DOI: 10.17182/hepdata.143112.v1/t7
title: "Figure 6b" of "J/psi suppression at forward rapidity in Au+Au collisions at sqrt(s_NN)=39 and 62.4 GeV"

description: $J/\psi$ $R_{AA}$ at $\sqrt{s_{NN}}$ = 39 and 62.4 GeV.
description: We present measurements of the $J/\psi$ invariant yields in $\sqrt{s_{NN}}$ = 39 and 62.4 GeV Au+Au collisions at forward rapidity (1.2 &lt; $|y|$ &lt; 2.2). Invariant yields are presented as a function of both collision centrality and transverse momentum. Nuclear modifications are obtained for central relative to peripheral Au+Au collisions ($R_{CP}$) and for various centrality selections in Au+Au relative to scaled $p$+$p$ cross sections obtained from other measurements ($R_{AA}$). The observed suppression patterns at 39 and 62.4 GeV are quite similar to those previously measured at 200 GeV. This similar suppression presents a challenge to theoretical models that contain various competing mechanisms with different energy dependencies, some of which cause suppression and others enhancement.
DOI: 10.17182/hepdata.143115.v1/t1
title: "Figure 6" of "Heavy-quark production and elliptic flow in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$ GeV"

description: Invariant yield of candidate electrons measured in Au+Au collisions at $\sqrt{s_{NN}}$=62.4 GeV for different centrality bins. The yields are scaled by powers of 10 for clarity. The systematic uncertainty is shown as boxes and is, in many cases, comparable to the symbol size.
description: We present measurements of electrons and positrons from the semileptonic decays of heavy- flavor hadrons at midrapidity (|$y$| &lt; 0.35) in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 &lt; $p^{e}_{T}$ &lt; 5 GeV/$c$. The invariant yield per binary collision is slightly enhanced above the $p+p$ reference in Au+Au 0%-20%, 20%-40% and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The $v_{2}$ of electrons from heavy-flavor decays is nonzero when averaged between 1.3 &lt; $p^{e}_{T}$ &lt; 2.5 GeV/$c$ for 0%-40% centrality collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. For 20%-40% centrality collisions, the $v_{2}$ at $\sqrt{s_{NN}}$ = 62.4 GeV is smaller than that for heavy flavor decays at $\sqrt{s_{NN}}$ = 200 GeV. The $v_{2}$ of the electrons from heavy-flavor decay at the lower beam energy is also smaller than $v_{2}$ for pions. Both results indicate that the heavy-quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at $\sqrt{s_{NN}}$ = 200 GeV.
DOI: 10.17182/hepdata.143115.v1/t2
title: "Figure 9" of "Heavy-quark production and elliptic flow in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$ GeV"

description: Cocktail prediction for photonic electron invariant yield. Invariant yield of (black dots) candidate electrons and (solid lines) electrons calculated from different photonic sources in Au+Au collisions at $\sqrt{s_{NN}}$=62.4 GeV for MB events.
description: We present measurements of electrons and positrons from the semileptonic decays of heavy- flavor hadrons at midrapidity (|$y$| &lt; 0.35) in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 &lt; $p^{e}_{T}$ &lt; 5 GeV/$c$. The invariant yield per binary collision is slightly enhanced above the $p+p$ reference in Au+Au 0%-20%, 20%-40% and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The $v_{2}$ of electrons from heavy-flavor decays is nonzero when averaged between 1.3 &lt; $p^{e}_{T}$ &lt; 2.5 GeV/$c$ for 0%-40% centrality collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. For 20%-40% centrality collisions, the $v_{2}$ at $\sqrt{s_{NN}}$ = 62.4 GeV is smaller than that for heavy flavor decays at $\sqrt{s_{NN}}$ = 200 GeV. The $v_{2}$ of the electrons from heavy-flavor decay at the lower beam energy is also smaller than $v_{2}$ for pions. Both results indicate that the heavy-quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at $\sqrt{s_{NN}}$ = 200 GeV.
DOI: 10.17182/hepdata.143115.v1/t3
title: "Figure 11" of "Heavy-quark production and elliptic flow in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$ GeV"

description: Invariant yield of heavy-flavor electrons measured in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV for different centrality bins. The yields are scaled by powers of 10 for clarity. The uncertainty bars (boxes) show the statistical (systematic) uncertainties.
description: We present measurements of electrons and positrons from the semileptonic decays of heavy- flavor hadrons at midrapidity (|$y$| &lt; 0.35) in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 &lt; $p^{e}_{T}$ &lt; 5 GeV/$c$. The invariant yield per binary collision is slightly enhanced above the $p+p$ reference in Au+Au 0%-20%, 20%-40% and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The $v_{2}$ of electrons from heavy-flavor decays is nonzero when averaged between 1.3 &lt; $p^{e}_{T}$ &lt; 2.5 GeV/$c$ for 0%-40% centrality collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. For 20%-40% centrality collisions, the $v_{2}$ at $\sqrt{s_{NN}}$ = 62.4 GeV is smaller than that for heavy flavor decays at $\sqrt{s_{NN}}$ = 200 GeV. The $v_{2}$ of the electrons from heavy-flavor decay at the lower beam energy is also smaller than $v_{2}$ for pions. Both results indicate that the heavy-quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at $\sqrt{s_{NN}}$ = 200 GeV.
DOI: 10.17182/hepdata.143115.v1/t10
title: "Figures 16d, 18" of "Heavy-quark production and elliptic flow in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$ GeV"

description: The $R_{AA}$ for electrons from heavy-flavor decays in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV for the indicated centralities. The error bars (boxes) represent the statistical (systematic) uncertainties. The global uncertainty due to the uncertainty in Ncoll for each centrality is given by the box on the right side of each plot.
description: We present measurements of electrons and positrons from the semileptonic decays of heavy- flavor hadrons at midrapidity (|$y$| &lt; 0.35) in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 &lt; $p^{e}_{T}$ &lt; 5 GeV/$c$. The invariant yield per binary collision is slightly enhanced above the $p+p$ reference in Au+Au 0%-20%, 20%-40% and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The $v_{2}$ of electrons from heavy-flavor decays is nonzero when averaged between 1.3 &lt; $p^{e}_{T}$ &lt; 2.5 GeV/$c$ for 0%-40% centrality collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. For 20%-40% centrality collisions, the $v_{2}$ at $\sqrt{s_{NN}}$ = 62.4 GeV is smaller than that for heavy flavor decays at $\sqrt{s_{NN}}$ = 200 GeV. The $v_{2}$ of the electrons from heavy-flavor decay at the lower beam energy is also smaller than $v_{2}$ for pions. Both results indicate that the heavy-quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at $\sqrt{s_{NN}}$ = 200 GeV.
DOI: 10.17182/hepdata.143115.v1/t11
title: "Figure 17a" of "Heavy-quark production and elliptic flow in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$ GeV"

description: The $R_{AA}$ values for electrons from heavy-flavor decay in Au+Au collisions at 62.4 GeV with the $R_{AA}$ results from $d$+Au, Cu+Cu, and Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV (data from [9, 21]). The error bars (boxes) represent the statistical (systematic) uncertainties. The $p_T$ ranges are as indicated: (a) 1 &lt; $p_T$ &lt; 3 GeV/c and (b) 3 &lt; $p_T$ &lt; 5 GeV/$c$.
description: We present measurements of electrons and positrons from the semileptonic decays of heavy- flavor hadrons at midrapidity (|$y$| &lt; 0.35) in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 &lt; $p^{e}_{T}$ &lt; 5 GeV/$c$. The invariant yield per binary collision is slightly enhanced above the $p+p$ reference in Au+Au 0%-20%, 20%-40% and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The $v_{2}$ of electrons from heavy-flavor decays is nonzero when averaged between 1.3 &lt; $p^{e}_{T}$ &lt; 2.5 GeV/$c$ for 0%-40% centrality collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. For 20%-40% centrality collisions, the $v_{2}$ at $\sqrt{s_{NN}}$ = 62.4 GeV is smaller than that for heavy flavor decays at $\sqrt{s_{NN}}$ = 200 GeV. The $v_{2}$ of the electrons from heavy-flavor decay at the lower beam energy is also smaller than $v_{2}$ for pions. Both results indicate that the heavy-quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at $\sqrt{s_{NN}}$ = 200 GeV.
DOI: 10.17182/hepdata.143115.v1/t12
title: "Figure 17b" of "Heavy-quark production and elliptic flow in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$ GeV"

description: The $R_{AA}$ values for electrons from heavy-flavor decay in Au+Au collisions at 62.4 GeV with the $R_{AA}$ results from $d$+Au, Cu+Cu, and Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV (data from [9, 21]). The error bars (boxes) represent the statistical (systematic) uncertainties. The $p_T$ ranges are as indicated: (a) 1 &lt; $p_T$ &lt; 3 GeV/c and (b) 3 &lt; $p_T$ &lt; 5 GeV/$c$.
description: We present measurements of electrons and positrons from the semileptonic decays of heavy- flavor hadrons at midrapidity (|$y$| &lt; 0.35) in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 &lt; $p^{e}_{T}$ &lt; 5 GeV/$c$. The invariant yield per binary collision is slightly enhanced above the $p+p$ reference in Au+Au 0%-20%, 20%-40% and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The $v_{2}$ of electrons from heavy-flavor decays is nonzero when averaged between 1.3 &lt; $p^{e}_{T}$ &lt; 2.5 GeV/$c$ for 0%-40% centrality collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. For 20%-40% centrality collisions, the $v_{2}$ at $\sqrt{s_{NN}}$ = 62.4 GeV is smaller than that for heavy flavor decays at $\sqrt{s_{NN}}$ = 200 GeV. The $v_{2}$ of the electrons from heavy-flavor decay at the lower beam energy is also smaller than $v_{2}$ for pions. Both results indicate that the heavy-quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at $\sqrt{s_{NN}}$ = 200 GeV.
DOI: 10.17182/hepdata.143115.v1/t4
title: "Figure 13" of "Heavy-quark production and elliptic flow in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$ GeV"

description: Invariant cross section of heavy-flavor electrons in $p$$+$$p$ collisions at $\sqrt{s_{_{NN}}}$ = 62.4 GeV. Candidate (inclusive), photonic, and heavy-flavor electron $v_{2}$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV for 20%-40% centrality. Fit parameters to p+p data in Fig 13.
description: We present measurements of electrons and positrons from the semileptonic decays of heavy- flavor hadrons at midrapidity (|$y$| &lt; 0.35) in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 &lt; $p^{e}_{T}$ &lt; 5 GeV/$c$. The invariant yield per binary collision is slightly enhanced above the $p+p$ reference in Au+Au 0%-20%, 20%-40% and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The $v_{2}$ of electrons from heavy-flavor decays is nonzero when averaged between 1.3 &lt; $p^{e}_{T}$ &lt; 2.5 GeV/$c$ for 0%-40% centrality collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. For 20%-40% centrality collisions, the $v_{2}$ at $\sqrt{s_{NN}}$ = 62.4 GeV is smaller than that for heavy flavor decays at $\sqrt{s_{NN}}$ = 200 GeV. The $v_{2}$ of the electrons from heavy-flavor decay at the lower beam energy is also smaller than $v_{2}$ for pions. Both results indicate that the heavy-quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at $\sqrt{s_{NN}}$ = 200 GeV.
DOI: 10.17182/hepdata.143115.v1/t5
title: "Figure 15a" of "Heavy-quark production and elliptic flow in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$ GeV"

description: Integrated invariant yield per binary collision vs $N_{coll}$ for heavy-flavor electrons in Au$+$Au collisions at $\sqrt{s_{_{NN}}}$ = 62.4 GeV for the indicated $p_{T}^{e}$ ranges. The data point at $N_{coll}$ =1 is for $p$$+$$p$ collisions.
description: We present measurements of electrons and positrons from the semileptonic decays of heavy- flavor hadrons at midrapidity (|$y$| &lt; 0.35) in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 &lt; $p^{e}_{T}$ &lt; 5 GeV/$c$. The invariant yield per binary collision is slightly enhanced above the $p+p$ reference in Au+Au 0%-20%, 20%-40% and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The $v_{2}$ of electrons from heavy-flavor decays is nonzero when averaged between 1.3 &lt; $p^{e}_{T}$ &lt; 2.5 GeV/$c$ for 0%-40% centrality collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. For 20%-40% centrality collisions, the $v_{2}$ at $\sqrt{s_{NN}}$ = 62.4 GeV is smaller than that for heavy flavor decays at $\sqrt{s_{NN}}$ = 200 GeV. The $v_{2}$ of the electrons from heavy-flavor decay at the lower beam energy is also smaller than $v_{2}$ for pions. Both results indicate that the heavy-quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at $\sqrt{s_{NN}}$ = 200 GeV.
DOI: 10.17182/hepdata.143115.v1/t6
title: "Figure 15b" of "Heavy-quark production and elliptic flow in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$ GeV"

description: Integrated invariant yield per binary collision vs $N_{coll}$ for heavy-flavor electrons in Au$+$Au collisions at $\sqrt{s_{_{NN}}}$ = 62.4 GeV for the indicated $p_{T}^{e}$ ranges. The data point at $N_{coll}$ =1 is for $p$$+$$p$ collisions.
description: We present measurements of electrons and positrons from the semileptonic decays of heavy- flavor hadrons at midrapidity (|$y$| &lt; 0.35) in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 &lt; $p^{e}_{T}$ &lt; 5 GeV/$c$. The invariant yield per binary collision is slightly enhanced above the $p+p$ reference in Au+Au 0%-20%, 20%-40% and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The $v_{2}$ of electrons from heavy-flavor decays is nonzero when averaged between 1.3 &lt; $p^{e}_{T}$ &lt; 2.5 GeV/$c$ for 0%-40% centrality collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. For 20%-40% centrality collisions, the $v_{2}$ at $\sqrt{s_{NN}}$ = 62.4 GeV is smaller than that for heavy flavor decays at $\sqrt{s_{NN}}$ = 200 GeV. The $v_{2}$ of the electrons from heavy-flavor decay at the lower beam energy is also smaller than $v_{2}$ for pions. Both results indicate that the heavy-quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at $\sqrt{s_{NN}}$ = 200 GeV.
DOI: 10.17182/hepdata.143115.v1/t7
title: "Figures 16a, 19" of "Heavy-quark production and elliptic flow in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$ GeV"

description: The $R_{AA}$ for electrons from heavy-flavor decays in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV for the indicated centralities. The error bars (boxes) represent the statistical (systematic) uncertainties. The global uncertainty due to the uncertainty in Ncoll for each centrality is given by the box on the right side of each plot.
description: We present measurements of electrons and positrons from the semileptonic decays of heavy- flavor hadrons at midrapidity (|$y$| &lt; 0.35) in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 &lt; $p^{e}_{T}$ &lt; 5 GeV/$c$. The invariant yield per binary collision is slightly enhanced above the $p+p$ reference in Au+Au 0%-20%, 20%-40% and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The $v_{2}$ of electrons from heavy-flavor decays is nonzero when averaged between 1.3 &lt; $p^{e}_{T}$ &lt; 2.5 GeV/$c$ for 0%-40% centrality collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. For 20%-40% centrality collisions, the $v_{2}$ at $\sqrt{s_{NN}}$ = 62.4 GeV is smaller than that for heavy flavor decays at $\sqrt{s_{NN}}$ = 200 GeV. The $v_{2}$ of the electrons from heavy-flavor decay at the lower beam energy is also smaller than $v_{2}$ for pions. Both results indicate that the heavy-quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at $\sqrt{s_{NN}}$ = 200 GeV.
DOI: 10.17182/hepdata.143115.v1/t8
title: "Figure 16b" of "Heavy-quark production and elliptic flow in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$ GeV"

description: The $R_{AA}$ for electrons from heavy-flavor decays in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV for the indicated centralities. The error bars (boxes) represent the statistical (systematic) uncertainties. The global uncertainty due to the uncertainty in Ncoll for each centrality is given by the box on the right side of each plot.
description: We present measurements of electrons and positrons from the semileptonic decays of heavy- flavor hadrons at midrapidity (|$y$| &lt; 0.35) in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 &lt; $p^{e}_{T}$ &lt; 5 GeV/$c$. The invariant yield per binary collision is slightly enhanced above the $p+p$ reference in Au+Au 0%-20%, 20%-40% and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The $v_{2}$ of electrons from heavy-flavor decays is nonzero when averaged between 1.3 &lt; $p^{e}_{T}$ &lt; 2.5 GeV/$c$ for 0%-40% centrality collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. For 20%-40% centrality collisions, the $v_{2}$ at $\sqrt{s_{NN}}$ = 62.4 GeV is smaller than that for heavy flavor decays at $\sqrt{s_{NN}}$ = 200 GeV. The $v_{2}$ of the electrons from heavy-flavor decay at the lower beam energy is also smaller than $v_{2}$ for pions. Both results indicate that the heavy-quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at $\sqrt{s_{NN}}$ = 200 GeV.