cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.141340.v1/t18
title: "Figure 3b-2" of "Elliptic flow for $\phi$ mesons and (anti)deuterons in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV"

description: $v_2$ vs $KE_T$ for several identified particle species obtained in mid-central Au+Au collisions, and ${v_2}/{n_q}$ vs ${KE_T}/{n_q}$ for the same particle species.
description: Differential elliptic flow ($v_2$) for $\phi$ mesons and (anti)deuterons ($\bar{d}$)$d$ is measured for Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. The $v_2$ for $\phi$ mesons follows the trend of lighter $\pi^{\pm}$ and $K^{\pm}$ mesons, suggesting that ordinary hadrons interacting with standard hadronic cross sections are not the primary driver for elliptic flow development. The $v_2$ values for ($\bar{d}$)$d$ suggest that elliptic flow is additive for composite particles. This further validation of the universal scaling of $v_2$ per constituent quark for baryons and mesons suggests that partonic collectivity dominates the transverse expansion dynamics.
DOI: 10.17182/hepdata.141340.v1/t19
title: "Figure 3b-3" of "Elliptic flow for $\phi$ mesons and (anti)deuterons in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV"

description: $v_2$ vs $KE_T$ for several identified particle species obtained in mid-central Au+Au collisions, and ${v_2}/{n_q}$ vs ${KE_T}/{n_q}$ for the same particle species.
description: Differential elliptic flow ($v_2$) for $\phi$ mesons and (anti)deuterons ($\bar{d}$)$d$ is measured for Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. The $v_2$ for $\phi$ mesons follows the trend of lighter $\pi^{\pm}$ and $K^{\pm}$ mesons, suggesting that ordinary hadrons interacting with standard hadronic cross sections are not the primary driver for elliptic flow development. The $v_2$ values for ($\bar{d}$)$d$ suggest that elliptic flow is additive for composite particles. This further validation of the universal scaling of $v_2$ per constituent quark for baryons and mesons suggests that partonic collectivity dominates the transverse expansion dynamics.
DOI: 10.17182/hepdata.141340.v1/t20
title: "Figure 3b-4" of "Elliptic flow for $\phi$ mesons and (anti)deuterons in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV"

description: $v_2$ vs $KE_T$ for several identified particle species obtained in mid-central Au+Au collisions, and ${v_2}/{n_q}$ vs ${KE_T}/{n_q}$ for the same particle species.
description: Differential elliptic flow ($v_2$) for $\phi$ mesons and (anti)deuterons ($\bar{d}$)$d$ is measured for Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. The $v_2$ for $\phi$ mesons follows the trend of lighter $\pi^{\pm}$ and $K^{\pm}$ mesons, suggesting that ordinary hadrons interacting with standard hadronic cross sections are not the primary driver for elliptic flow development. The $v_2$ values for ($\bar{d}$)$d$ suggest that elliptic flow is additive for composite particles. This further validation of the universal scaling of $v_2$ per constituent quark for baryons and mesons suggests that partonic collectivity dominates the transverse expansion dynamics.
DOI: 10.17182/hepdata.141340.v1/t21
title: "Figure 3b-5" of "Elliptic flow for $\phi$ mesons and (anti)deuterons in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV"

description: $v_2$ vs $KE_T$ for several identified particle species obtained in mid-central Au+Au collisions, and ${v_2}/{n_q}$ vs ${KE_T}/{n_q}$ for the same particle species.
description: Differential elliptic flow ($v_2$) for $\phi$ mesons and (anti)deuterons ($\bar{d}$)$d$ is measured for Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. The $v_2$ for $\phi$ mesons follows the trend of lighter $\pi^{\pm}$ and $K^{\pm}$ mesons, suggesting that ordinary hadrons interacting with standard hadronic cross sections are not the primary driver for elliptic flow development. The $v_2$ values for ($\bar{d}$)$d$ suggest that elliptic flow is additive for composite particles. This further validation of the universal scaling of $v_2$ per constituent quark for baryons and mesons suggests that partonic collectivity dominates the transverse expansion dynamics.
DOI: 10.17182/hepdata.141362.v1/t1
title: "Figure 2a" of "Nuclear modification factors for hadrons at forward and backward rapidities in deuteron gold collisions at s(NN)**(1/2) = 200-GeV."

description: $R_{cp}$ as a function of $p_T$ for Punch-Through Hadrons at forward rapidity and backward rapidity for different centrality classes. Systematic uncertainties which are point-to-point uncorrelated (sys-uncorr) and correlated (sys-corr) are shown.
description: We report on charged hadron production in deuteron-gold reactions at $\sqrt{s_{NN}}$ = 200 GeV. Our measurements in the deuteron-direction cover 1.4 &lt; $\eta$ &lt; 2.2, referred to as forward rapidity, and in the gold-direction -2.0 &lt; $\eta$ &lt; -1.4, referred to as backward rapidity, and a transverse momentum range $p_T$ = 0.5 - 4.0 GeV/$c$. We compare the relative yields for different deuteron-gold collision centrality classes. We observe a suppression relative to binary collision scaling at forward rapidity, sensitive to low momentum fraction $(x)$ partons in the gold nucleus, and an enhancement at backward rapidity, sensitive to high momentum fraction partons in the gold nucleus.
DOI: 10.17182/hepdata.141362.v1/t2
title: "Figure 2b" of "Nuclear modification factors for hadrons at forward and backward rapidities in deuteron gold collisions at s(NN)**(1/2) = 200-GeV."

description: $R_{cp}$ as a function of $p_T$ for Hadron Decay Muons at forward rapidity and backward rapidity for different centrality classes. Systematic uncertainties which are point-to-point uncorrelated (sys-uncorr) and correlated (sys-corr) are shown.
description: We report on charged hadron production in deuteron-gold reactions at $\sqrt{s_{NN}}$ = 200 GeV. Our measurements in the deuteron-direction cover 1.4 &lt; $\eta$ &lt; 2.2, referred to as forward rapidity, and in the gold-direction -2.0 &lt; $\eta$ &lt; -1.4, referred to as backward rapidity, and a transverse momentum range $p_T$ = 0.5 - 4.0 GeV/$c$. We compare the relative yields for different deuteron-gold collision centrality classes. We observe a suppression relative to binary collision scaling at forward rapidity, sensitive to low momentum fraction $(x)$ partons in the gold nucleus, and an enhancement at backward rapidity, sensitive to high momentum fraction partons in the gold nucleus.
DOI: 10.17182/hepdata.141362.v1/t3
title: "Figure 3a" of "Nuclear modification factors for hadrons at forward and backward rapidities in deuteron gold collisions at s(NN)**(1/2) = 200-GeV."

description: $R_{cp}$ as a function of $\eta$ for 1.5 &lt; $p_T$ &lt; 4.0 GeV/$c$ for different centrality classes. Systematic uncertainties which are point-to-point uncorrelated (sys-uncorr) and correlated (sys-corr) are shown.
description: We report on charged hadron production in deuteron-gold reactions at $\sqrt{s_{NN}}$ = 200 GeV. Our measurements in the deuteron-direction cover 1.4 &lt; $\eta$ &lt; 2.2, referred to as forward rapidity, and in the gold-direction -2.0 &lt; $\eta$ &lt; -1.4, referred to as backward rapidity, and a transverse momentum range $p_T$ = 0.5 - 4.0 GeV/$c$. We compare the relative yields for different deuteron-gold collision centrality classes. We observe a suppression relative to binary collision scaling at forward rapidity, sensitive to low momentum fraction $(x)$ partons in the gold nucleus, and an enhancement at backward rapidity, sensitive to high momentum fraction partons in the gold nucleus.
DOI: 10.17182/hepdata.141362.v1/t4
title: "Figure 3b" of "Nuclear modification factors for hadrons at forward and backward rapidities in deuteron gold collisions at s(NN)**(1/2) = 200-GeV."

description: $R_{cp}$ as a function of $\eta$ for 1.5 &lt; $p_T$ &lt; 4.0 GeV/$c$ for different centrality classes. Systematic uncertainties which are point-to-point uncorrelated (sys-uncorr) and correlated (sys-corr) are shown.
description: We report on charged hadron production in deuteron-gold reactions at $\sqrt{s_{NN}}$ = 200 GeV. Our measurements in the deuteron-direction cover 1.4 &lt; $\eta$ &lt; 2.2, referred to as forward rapidity, and in the gold-direction -2.0 &lt; $\eta$ &lt; -1.4, referred to as backward rapidity, and a transverse momentum range $p_T$ = 0.5 - 4.0 GeV/$c$. We compare the relative yields for different deuteron-gold collision centrality classes. We observe a suppression relative to binary collision scaling at forward rapidity, sensitive to low momentum fraction $(x)$ partons in the gold nucleus, and an enhancement at backward rapidity, sensitive to high momentum fraction partons in the gold nucleus.
DOI: 10.17182/hepdata.141377.v1/t1
title: "Table 1" of "Ground and excited charmonium state production in p+p collisions at sqrt(s)=200 GeV"

description: Foreground, background counts in the $J/\psi$ mass region, and the signal count.
description: We report on charmonium measurements [$J/\psi$ (1S), $\psi^{\prime}$ (2S), and $\chi_c$ (1P)] in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV. We find that the fraction of $J/\psi$ coming from the feed-down decay of $\psi^{\prime}$ and $\chi_c$ in the midrapidity region ($|\eta|$ &lt; 0.35) is 9.6 $\pm$ 2.4% and 32 $\pm$ 9%, respectively. We also report new, higher statistics $p_T$ and rapidity dependencies of the $J/\psi$ yield via dielectron decay in the same midrapidity range and at forward rapidity (1.2 &lt; $|\eta|$ &lt; 2.4) via dimuon decay. These results are compared with measurements from other experiments and discussed in the context of current charmonium production models.
DOI: 10.17182/hepdata.141377.v1/t2
title: "Table 2" of "Ground and excited charmonium state production in p+p collisions at sqrt(s)=200 GeV"

description: Foreground, background counts in the $J/\psi$ mass region, and the signal count.
description: We report on charmonium measurements [$J/\psi$ (1S), $\psi^{\prime}$ (2S), and $\chi_c$ (1P)] in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV. We find that the fraction of $J/\psi$ coming from the feed-down decay of $\psi^{\prime}$ and $\chi_c$ in the midrapidity region ($|\eta|$ &lt; 0.35) is 9.6 $\pm$ 2.4% and 32 $\pm$ 9%, respectively. We also report new, higher statistics $p_T$ and rapidity dependencies of the $J/\psi$ yield via dielectron decay in the same midrapidity range and at forward rapidity (1.2 &lt; $|\eta|$ &lt; 2.4) via dimuon decay. These results are compared with measurements from other experiments and discussed in the context of current charmonium production models.
DOI: 10.17182/hepdata.141377.v1/t3
title: "Table 6a" of "Ground and excited charmonium state production in p+p collisions at sqrt(s)=200 GeV"

description: $\psi^{\prime}(J/\psi)$ dielectron yield ratio measured at $|y|$ &lt; 0.35 followed by point-to-point uncorrelated (uncorr.) (statistical and uncorrelated systematic uncertainties) and correlated systematic (corr.) uncertainties.
description: We report on charmonium measurements [$J/\psi$ (1S), $\psi^{\prime}$ (2S), and $\chi_c$ (1P)] in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV. We find that the fraction of $J/\psi$ coming from the feed-down decay of $\psi^{\prime}$ and $\chi_c$ in the midrapidity region ($|\eta|$ &lt; 0.35) is 9.6 $\pm$ 2.4% and 32 $\pm$ 9%, respectively. We also report new, higher statistics $p_T$ and rapidity dependencies of the $J/\psi$ yield via dielectron decay in the same midrapidity range and at forward rapidity (1.2 &lt; $|\eta|$ &lt; 2.4) via dimuon decay. These results are compared with measurements from other experiments and discussed in the context of current charmonium production models.
DOI: 10.17182/hepdata.141377.v1/t4
title: "Table 6b" of "Ground and excited charmonium state production in p+p collisions at sqrt(s)=200 GeV"

description: $\psi^{\prime}(J/\psi)$ dielectron yield ratio measured at $|y|$ &lt; 0.35 followed by point-to-point uncorrelated (uncorr.) (statistical and uncorrelated systematic uncertainties) and correlated systematic (corr.) uncertainties.
description: We report on charmonium measurements [$J/\psi$ (1S), $\psi^{\prime}$ (2S), and $\chi_c$ (1P)] in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV. We find that the fraction of $J/\psi$ coming from the feed-down decay of $\psi^{\prime}$ and $\chi_c$ in the midrapidity region ($|\eta|$ &lt; 0.35) is 9.6 $\pm$ 2.4% and 32 $\pm$ 9%, respectively. We also report new, higher statistics $p_T$ and rapidity dependencies of the $J/\psi$ yield via dielectron decay in the same midrapidity range and at forward rapidity (1.2 &lt; $|\eta|$ &lt; 2.4) via dimuon decay. These results are compared with measurements from other experiments and discussed in the context of current charmonium production models.
DOI: 10.17182/hepdata.141377.v1/t5
title: "Table 15a" of "Ground and excited charmonium state production in p+p collisions at sqrt(s)=200 GeV"

description: $J/\psi$ counts obtained from the dimuon decay analysis of four different data sets, determined using the fit function. The S and N following 2006 and 2008 indicate the data sets for the south and north forward arms.
description: We report on charmonium measurements [$J/\psi$ (1S), $\psi^{\prime}$ (2S), and $\chi_c$ (1P)] in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV. We find that the fraction of $J/\psi$ coming from the feed-down decay of $\psi^{\prime}$ and $\chi_c$ in the midrapidity region ($|\eta|$ &lt; 0.35) is 9.6 $\pm$ 2.4% and 32 $\pm$ 9%, respectively. We also report new, higher statistics $p_T$ and rapidity dependencies of the $J/\psi$ yield via dielectron decay in the same midrapidity range and at forward rapidity (1.2 &lt; $|\eta|$ &lt; 2.4) via dimuon decay. These results are compared with measurements from other experiments and discussed in the context of current charmonium production models.
DOI: 10.17182/hepdata.141377.v1/t6
title: "Table 15b" of "Ground and excited charmonium state production in p+p collisions at sqrt(s)=200 GeV"

description: $J/\psi$ counts obtained from the dimuon decay analysis of four different data sets, determined using the fit function. The S and N following 2006 and 2008 indicate the data sets for the south and north forward arms.
description: We report on charmonium measurements [$J/\psi$ (1S), $\psi^{\prime}$ (2S), and $\chi_c$ (1P)] in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV. We find that the fraction of $J/\psi$ coming from the feed-down decay of $\psi^{\prime}$ and $\chi_c$ in the midrapidity region ($|\eta|$ &lt; 0.35) is 9.6 $\pm$ 2.4% and 32 $\pm$ 9%, respectively. We also report new, higher statistics $p_T$ and rapidity dependencies of the $J/\psi$ yield via dielectron decay in the same midrapidity range and at forward rapidity (1.2 &lt; $|\eta|$ &lt; 2.4) via dimuon decay. These results are compared with measurements from other experiments and discussed in the context of current charmonium production models.
DOI: 10.17182/hepdata.141377.v1/t10
title: "Figure 20" of "Ground and excited charmonium state production in p+p collisions at sqrt(s)=200 GeV"

description: Transverse momentum dependence of the $J/\psi$ dimuon differential cross section obtained in the muon arms in 2006 and 2008 Runs. Uncertainties are point-to-point uncorrelated (uncorr.) (statistical and uncorrelated systematic uncertainties) and correlated systematic (corr.) uncertainties. The global uncertainty is 10%.
description: We report on charmonium measurements [$J/\psi$ (1S), $\psi^{\prime}$ (2S), and $\chi_c$ (1P)] in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV. We find that the fraction of $J/\psi$ coming from the feed-down decay of $\psi^{\prime}$ and $\chi_c$ in the midrapidity region ($|\eta|$ &lt; 0.35) is 9.6 $\pm$ 2.4% and 32 $\pm$ 9%, respectively. We also report new, higher statistics $p_T$ and rapidity dependencies of the $J/\psi$ yield via dielectron decay in the same midrapidity range and at forward rapidity (1.2 &lt; $|\eta|$ &lt; 2.4) via dimuon decay. These results are compared with measurements from other experiments and discussed in the context of current charmonium production models.
DOI: 10.17182/hepdata.141377.v1/t11
title: "Figure 21" of "Ground and excited charmonium state production in p+p collisions at sqrt(s)=200 GeV"

description: Rapidity dependence of the $J/\psi$ yield combining dielectron ($|y|$ &lt; 0.35 - full squares) with dimuon channels (1.2 &lt; $|y|$ &lt; 2.4 - full circles) along with the fits used to estimate the total cross section. Uncertainties are point-to-point uncorrelated (uncorr.) (statistical and uncorrelated systematic uncertainties) and correlated systematic (corr.) uncertainties. The global uncertainty is 10%.
description: We report on charmonium measurements [$J/\psi$ (1S), $\psi^{\prime}$ (2S), and $\chi_c$ (1P)] in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV. We find that the fraction of $J/\psi$ coming from the feed-down decay of $\psi^{\prime}$ and $\chi_c$ in the midrapidity region ($|\eta|$ &lt; 0.35) is 9.6 $\pm$ 2.4% and 32 $\pm$ 9%, respectively. We also report new, higher statistics $p_T$ and rapidity dependencies of the $J/\psi$ yield via dielectron decay in the same midrapidity range and at forward rapidity (1.2 &lt; $|\eta|$ &lt; 2.4) via dimuon decay. These results are compared with measurements from other experiments and discussed in the context of current charmonium production models.
DOI: 10.17182/hepdata.141377.v1/t7
title: "Figure 8a" of "Ground and excited charmonium state production in p+p collisions at sqrt(s)=200 GeV"

description: Transverse momentum dependence of $J/\psi$ and $\psi^{\prime}$ yields in $|y|$ &lt; 0.35, and ${\psi^{\prime}}/{J/\psi}$ ratio together with ratios obtained in other experiments. Uncertainties are point-to-point uncorrelated (uncorr.) (statistical and uncorrelated systematic uncertainties) and correlated systematic (corr.) uncertainties. The global uncertainty is 10%.
description: We report on charmonium measurements [$J/\psi$ (1S), $\psi^{\prime}$ (2S), and $\chi_c$ (1P)] in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV. We find that the fraction of $J/\psi$ coming from the feed-down decay of $\psi^{\prime}$ and $\chi_c$ in the midrapidity region ($|\eta|$ &lt; 0.35) is 9.6 $\pm$ 2.4% and 32 $\pm$ 9%, respectively. We also report new, higher statistics $p_T$ and rapidity dependencies of the $J/\psi$ yield via dielectron decay in the same midrapidity range and at forward rapidity (1.2 &lt; $|\eta|$ &lt; 2.4) via dimuon decay. These results are compared with measurements from other experiments and discussed in the context of current charmonium production models.
DOI: 10.17182/hepdata.141377.v1/t8
title: "Figure 8b-1" of "Ground and excited charmonium state production in p+p collisions at sqrt(s)=200 GeV"

description: Transverse momentum dependence of $J/\psi$ and $\psi^{\prime}$ yields in $|y|$ &lt; 0.35, and ${\psi^{\prime}}/{J/\psi}$ ratio together with ratios obtained in other experiments. Uncertainties are point-to-point uncorrelated (uncorr.) (statistical and uncorrelated systematic uncertainties) and correlated systematic (corr.) uncertainties. The global uncertainty is 10%.
description: We report on charmonium measurements [$J/\psi$ (1S), $\psi^{\prime}$ (2S), and $\chi_c$ (1P)] in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV. We find that the fraction of $J/\psi$ coming from the feed-down decay of $\psi^{\prime}$ and $\chi_c$ in the midrapidity region ($|\eta|$ &lt; 0.35) is 9.6 $\pm$ 2.4% and 32 $\pm$ 9%, respectively. We also report new, higher statistics $p_T$ and rapidity dependencies of the $J/\psi$ yield via dielectron decay in the same midrapidity range and at forward rapidity (1.2 &lt; $|\eta|$ &lt; 2.4) via dimuon decay. These results are compared with measurements from other experiments and discussed in the context of current charmonium production models.
DOI: 10.17182/hepdata.141377.v1/t9
title: "Figure 8b-2" of "Ground and excited charmonium state production in p+p collisions at sqrt(s)=200 GeV"

description: Transverse momentum dependence of $J/\psi$ and $\psi^{\prime}$ yields in $|y|$ &lt; 0.35, and ${\psi^{\prime}}/{J/\psi}$ ratio together with ratios obtained in other experiments. Uncertainties are point-to-point uncorrelated (uncorr.) (statistical and uncorrelated systematic uncertainties) and correlated systematic (corr.) uncertainties. The global uncertainty is 10%.
description: We report on charmonium measurements [$J/\psi$ (1S), $\psi^{\prime}$ (2S), and $\chi_c$ (1P)] in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV. We find that the fraction of $J/\psi$ coming from the feed-down decay of $\psi^{\prime}$ and $\chi_c$ in the midrapidity region ($|\eta|$ &lt; 0.35) is 9.6 $\pm$ 2.4% and 32 $\pm$ 9%, respectively. We also report new, higher statistics $p_T$ and rapidity dependencies of the $J/\psi$ yield via dielectron decay in the same midrapidity range and at forward rapidity (1.2 &lt; $|\eta|$ &lt; 2.4) via dimuon decay. These results are compared with measurements from other experiments and discussed in the context of current charmonium production models.
DOI: 10.17182/hepdata.141453.v1/t1
title: "Figure 7a" of "Measurement of emission angle anisotropy via long-range angular correlations with high $p_T$ hadrons in $d$$+$Au and $p$$+$$p$ collisions at $\sqrt{s_{_{NN}}}=200$ GeV"

description: Fourier fit coefficients for CNT-MPCS (Au-going) correlations, as a function of collision system and $\pi^0$ $p_T$: (a) the negative of the dipole coefficient, $-c_1$; (b) the quadrupole coefficient $c_2$; (c) the ratio ${-c_2}/{c_1}$.
description: We present measurements of two-particle angular correlations between high-transverse-momentum ( 2&lt; $p_T$ &lt; 11 GeV/$c$) $\pi^0$ observed at midrapidity ($|\eta|$ &lt; 0.35) and particles produced either at forward (3.1 &lt; $\eta$ &lt; 3.9) or backward (−3.7 &lt; $\eta$ &lt; −3.1) rapidity in $d$+Au and $p$+$p$ collisions at $\sqrt{s_{NN}}$ = 200 GeV. The azimuthal angle correlations for particle pairs with this large rapidity gap in the Au-going direction exhibit a ridge-like structure that persists up to $p_T$ ≈ 6 GeV/$c$ and which strongly depends on collision centrality, which is a similar characteristic to the hydrodynamical particle flow in A+A collisions. The ridge-like structure is absent in the $d$-going direction as well as in $p$+$p$ collisions, in the transverse-momentum range studied. The results indicate that the ridge-like structure is shifted in the Au-going direction toward more central collisions, similar to the charged-particle pseudorapidity distributions.
DOI: 10.17182/hepdata.141453.v1/t2
title: "Figure 7b" of "Measurement of emission angle anisotropy via long-range angular correlations with high $p_T$ hadrons in $d$$+$Au and $p$$+$$p$ collisions at $\sqrt{s_{_{NN}}}=200$ GeV"

description: Fourier fit coefficients for CNT-MPCS (Au-going) correlations, as a function of collision system and $\pi^0$ $p_T$: Fractional systematic uncertainty on the quadrupole coefficient $c_2$ for $d$+Au.
description: We present measurements of two-particle angular correlations between high-transverse-momentum ( 2&lt; $p_T$ &lt; 11 GeV/$c$) $\pi^0$ observed at midrapidity ($|\eta|$ &lt; 0.35) and particles produced either at forward (3.1 &lt; $\eta$ &lt; 3.9) or backward (−3.7 &lt; $\eta$ &lt; −3.1) rapidity in $d$+Au and $p$+$p$ collisions at $\sqrt{s_{NN}}$ = 200 GeV. The azimuthal angle correlations for particle pairs with this large rapidity gap in the Au-going direction exhibit a ridge-like structure that persists up to $p_T$ ≈ 6 GeV/$c$ and which strongly depends on collision centrality, which is a similar characteristic to the hydrodynamical particle flow in A+A collisions. The ridge-like structure is absent in the $d$-going direction as well as in $p$+$p$ collisions, in the transverse-momentum range studied. The results indicate that the ridge-like structure is shifted in the Au-going direction toward more central collisions, similar to the charged-particle pseudorapidity distributions.