cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.143520.v1/t9
title: "Figure 7" of "Correlated production of p and anti-p in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: Conditional yields per trigger for baryon and meson triggers with associated mesons. Triggers have 2.5 &lt; $p_T$ &lt; 4.0 GeV/$c$ and associated particles have 1.8 &lt; $p_T$ &lt; 2.5 GeV/$c$. There is an additional 13.6% normalization error.
description: Correlations between $p$ and $\bar{p}$ at transverse momenta typical of enhanced baryon production in Au+Au collisions are reported. The PHENIX experiment measured same and opposite sign baryon pairs in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Correlated production of $p$ and $\bar{p}$ with the trigger particle from the range 2.5 &lt; $p_T$ &lt; 4.0 GeV/$c$ and the associated particle with 1.8 &lt; $p_T$ &lt; 2.5 GeV/$c$ is observed to be nearly independent of the centrality of the collisions. Same sign pairs show no correlation at any centrality. The conditional yield of mesons triggered by baryons (and anti-baryons) and mesons in the same $p_T$ range rises with increasing centrality, except for the most central collisions, where baryons show a significantly smaller number of associated mesons. These data are consistent with a picture in which hard scattered partons produce correlated $p$ and $\bar{p}$ in the $p_T$ region of the baryon excess.
DOI: 10.17182/hepdata.143521.v1/t2
title: "Figure 7" of "Low-momentum direct photon measurement in Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}=200$ GeV"

description: The direct photon spectra for Minimum Bias and 0-40% centrality in $\sqrt{s_{NN}}$ = 200 GeV Cu+Cu collisions.
description: We have measured direct photons for $p_T$ &lt; 5 GeV/$c$ in minimum bias and 0% - 40% most central events at midrapidity for Cu+Cu collisions at $\sqrt{s_{NN}}$ = 200 GeV. The $e^+e^−$ contribution from quasi-real direct virtual photons has been determined as an excess over the known hadronic contributions in the $e^+e^−$ mass distribution. A clear enhancement of photons over the binary scaled $p$+$p$ fit is observed for $p_T$ &lt; 4 GeV/$c$ in Cu+Cu data. The $p_T$ spectra are consistent with the Au+Au data covering a similar number of participants. The inverse slopes of the exponential fits to the excess after subtraction of the $p$+$p$ baseline are 285 $\pm$ 53(stat) $\pm$ 57(syst) MeV/$c$ and 333 $\pm$ 72(stat) $\pm$ 45(syst) MeV/$c$ for minimum bias and 0% - 40% most central events, respectively. The rapidity density, $dN/dy$, of photons demonstrates the same power law as a function of $dN_{ch}/d$\eta$ observed in Au+Au at the same collision energy.
DOI: 10.17182/hepdata.143521.v1/t1
title: "Figure 6" of "Low-momentum direct photon measurement in Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}=200$ GeV"

description: Direct photon fraction measured with the virtual photon method for different systems in $\sqrt{s_{NN}}$ = 200 GeV Cu+Cu collisions.
description: We have measured direct photons for $p_T$ &lt; 5 GeV/$c$ in minimum bias and 0% - 40% most central events at midrapidity for Cu+Cu collisions at $\sqrt{s_{NN}}$ = 200 GeV. The $e^+e^−$ contribution from quasi-real direct virtual photons has been determined as an excess over the known hadronic contributions in the $e^+e^−$ mass distribution. A clear enhancement of photons over the binary scaled $p$+$p$ fit is observed for $p_T$ &lt; 4 GeV/$c$ in Cu+Cu data. The $p_T$ spectra are consistent with the Au+Au data covering a similar number of participants. The inverse slopes of the exponential fits to the excess after subtraction of the $p$+$p$ baseline are 285 $\pm$ 53(stat) $\pm$ 57(syst) MeV/$c$ and 333 $\pm$ 72(stat) $\pm$ 45(syst) MeV/$c$ for minimum bias and 0% - 40% most central events, respectively. The rapidity density, $dN/dy$, of photons demonstrates the same power law as a function of $dN_{ch}/d$\eta$ observed in Au+Au at the same collision energy.
DOI: 10.17182/hepdata.143522.v1/t1
title: "Figure 2" of "The polarized gluon contribution to the proton spin from the double helicity asymmetry in inclusive pi^0 production in polarized p+p collisions at sqrt(s)=200 GeV"

description: Asymmetry in $\pi^0$ production as a function of $p_T$. Not included in the table: 8.3% common scale uncertainty (scales both the value and and the stat. uncertainty by the same factor), and 7x10$^{-4}$ common shift uncertainty.
description: The double helicity asymmetry in neutral pion production for $p_T$ = 1 to 12 GeV/$c$ has been measured with the PHENIX experiment in order to access the gluon spin contribution, $\Delta$$G$, to the proton spin. Measured asymmetries are consistent with zero, and at a theory scale of $\mu^2$ = 4 GeV$^2$ give $\Delta$$G^{[0.02,0.3]}$ = 0.1 to 0.2, with a constraint of -0.7 &lt; $\Delta$$G^{[0.02,0.3]}$ &lt; 0.5 at $\Delta\chi^2$ = 9 ($~3\sigma$) for our sampled gluon momentum fraction ($x$) range, 0.02 to 0.3. The results are obtained using predictions for our measured asymmetries generated from four representative fits to polarized deep inelastic scattering data. We also consider the dependence of the $\Delta$$G$ constraint on the choice of theoretical scale, a dominant uncertainty in these predictions.
DOI: 10.17182/hepdata.143522.v1/t2
title: "Figure 3" of "The polarized gluon contribution to the proton spin from the double helicity asymmetry in inclusive pi^0 production in polarized p+p collisions at sqrt(s)=200 GeV"

description: $\pi^0$ asymmetry, combined Run-5 and Run-6
description: The double helicity asymmetry in neutral pion production for $p_T$ = 1 to 12 GeV/$c$ has been measured with the PHENIX experiment in order to access the gluon spin contribution, $\Delta$$G$, to the proton spin. Measured asymmetries are consistent with zero, and at a theory scale of $\mu^2$ = 4 GeV$^2$ give $\Delta$$G^{[0.02,0.3]}$ = 0.1 to 0.2, with a constraint of -0.7 &lt; $\Delta$$G^{[0.02,0.3]}$ &lt; 0.5 at $\Delta\chi^2$ = 9 ($~3\sigma$) for our sampled gluon momentum fraction ($x$) range, 0.02 to 0.3. The results are obtained using predictions for our measured asymmetries generated from four representative fits to polarized deep inelastic scattering data. We also consider the dependence of the $\Delta$$G$ constraint on the choice of theoretical scale, a dominant uncertainty in these predictions.
DOI: 10.17182/hepdata.143523.v1/t1
title: "Figure 2" of "Measurement of direct photon production in p + p collisions at s**(1/2) = 200-GeV."

description: Direct photon spectra with NLO pQCD calculations for three theory scales, $\mu$ and a comparison to the NLO pQCD calculations for $\mu$ = $p_T$.
description: Cross sections for mid-rapidity production of direct photons in $p$+$p$ collisions at the Relativistic Heavy Ion Collider (RHIC) are reported for 3 &lt; $p_T$ &lt; 16 GeV/$c$. Next-to-leading order (NLO) perturbative QCD (pQCD) describes the data well for $p_T$ &gt; 5 GeV/$c$, where the uncertainties of the measurement and theory are comparable. We also report on the effect of requiring the photons to be isolated from parton jet energy. The observed fraction of isolated photons is well described by pQCD for $p_T$ &gt; 7 GeV/$c$.
DOI: 10.17182/hepdata.143523.v1/t2
title: "Figure 3a" of "Measurement of direct photon production in p + p collisions at s**(1/2) = 200-GeV."

description: Ratio of isolated direct photons to all direct photons from the $\pi^0$-tagging method.
description: Cross sections for mid-rapidity production of direct photons in $p$+$p$ collisions at the Relativistic Heavy Ion Collider (RHIC) are reported for 3 &lt; $p_T$ &lt; 16 GeV/$c$. Next-to-leading order (NLO) perturbative QCD (pQCD) describes the data well for $p_T$ &gt; 5 GeV/$c$, where the uncertainties of the measurement and theory are comparable. We also report on the effect of requiring the photons to be isolated from parton jet energy. The observed fraction of isolated photons is well described by pQCD for $p_T$ &gt; 7 GeV/$c$.
DOI: 10.17182/hepdata.143523.v1/t3
title: "Figure 3b" of "Measurement of direct photon production in p + p collisions at s**(1/2) = 200-GeV."

description: Ratio of isolated direct photons to all direct photons from the $\pi^0$-tagging method.
description: Cross sections for mid-rapidity production of direct photons in $p$+$p$ collisions at the Relativistic Heavy Ion Collider (RHIC) are reported for 3 &lt; $p_T$ &lt; 16 GeV/$c$. Next-to-leading order (NLO) perturbative QCD (pQCD) describes the data well for $p_T$ &gt; 5 GeV/$c$, where the uncertainties of the measurement and theory are comparable. We also report on the effect of requiring the photons to be isolated from parton jet energy. The observed fraction of isolated photons is well described by pQCD for $p_T$ &gt; 7 GeV/$c$.
DOI: 10.17182/hepdata.143605.v1/t1
title: "Figure 1a" of "Transverse momentum and centrality dependence of dihadron correlations in Au+Au collisions at sqrt(s_NN)=200 GeV: Jet-quenching and the response of partonic matter"

description: Per-trigger yield versus $\Delta\phi$ for various trigger and partner $p_T$ ($p_T^A$ $\otimes$ $p_T^B$), in $p$+$p$ and 0-20% Au+Au collisions. <i>The systematic errors on $v_2$ are represented by "sys. corr." and are dominated by the reaction plane resolution. The fit that accounts for the overlap of the near- and away-side Gaussians at $\Delta\phi_{min}$ gives systematically lower $b_0$ values that that for ZYAM, and is assigned as the differences as one-sided systematic errors on $b_0$ represented by "sys. uncorr.".</i>
description: Azimuthal angle ($\Delta\phi$) correlations are presented for charged hadrons from dijets for 0.4 &lt; $p_T$ &lt; 10 GeV/$c$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. With increasing $p_T$, the away-side distribution evolves from a broad to a concave shape, then to a convex shape. Comparisons to $p$+$p$ data suggest that the away-side can be divided into a partially suppressed "head" region centered at $\Delta\phi$ ~ $\pi$, and an enhanced "shoulder" region centered at $\Delta\phi$ ~ $\pi$ +/- 1.1. The $p_T$ spectrum for the "head" region softens toward central collisions, consistent with the onset of jet quenching. The spectral slope for the "shoulder" region is independent of centrality and trigger $p_T$, which offers constraints on energy transport mechanisms and suggests that the "shoulder" region contains the medium response to energetic jets.
DOI: 10.17182/hepdata.143605.v1/t2
title: "Figure 1b" of "Transverse momentum and centrality dependence of dihadron correlations in Au+Au collisions at sqrt(s_NN)=200 GeV: Jet-quenching and the response of partonic matter"

description: Per-trigger yield versus $\Delta\phi$ for various trigger and partner $p_T$ ($p_T^A$ $\otimes$ $p_T^B$), in $p$+$p$ and 0-20% Au+Au collisions. <i>The systematic errors on $v_2$ are represented by "sys. corr." and are dominated by the reaction plane resolution. The fit that accounts for the overlap of the near- and away-side Gaussians at $\Delta\phi_{min}$ gives systematically lower $b_0$ values that that for ZYAM, and is assigned as the differences as one-sided systematic errors on $b_0$ represented by "sys. uncorr.".</i>
description: Azimuthal angle ($\Delta\phi$) correlations are presented for charged hadrons from dijets for 0.4 &lt; $p_T$ &lt; 10 GeV/$c$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. With increasing $p_T$, the away-side distribution evolves from a broad to a concave shape, then to a convex shape. Comparisons to $p$+$p$ data suggest that the away-side can be divided into a partially suppressed "head" region centered at $\Delta\phi$ ~ $\pi$, and an enhanced "shoulder" region centered at $\Delta\phi$ ~ $\pi$ +/- 1.1. The $p_T$ spectrum for the "head" region softens toward central collisions, consistent with the onset of jet quenching. The spectral slope for the "shoulder" region is independent of centrality and trigger $p_T$, which offers constraints on energy transport mechanisms and suggests that the "shoulder" region contains the medium response to energetic jets.
DOI: 10.17182/hepdata.143605.v1/t3
title: "Figure 2" of "Transverse momentum and centrality dependence of dihadron correlations in Au+Au collisions at sqrt(s_NN)=200 GeV: Jet-quenching and the response of partonic matter"

description: $R_{HS}$ versus $p_T^B$ for $p$+$p$ and Au+Au collisions for four trigger selections. <i>The systematic errors on $v_2$ are represented by "sys. corr." and are dominated by the reaction plane resolution. The fit that accounts for the overlap of the near- and away-side Gaussians at $\Delta\phi_{min}$ gives systematically lower $b_0$ values that that for ZYAM, and is assigned as the differences as one-sided systematic errors on $b_0$ represented by "sys. uncorr.".</i>
description: Azimuthal angle ($\Delta\phi$) correlations are presented for charged hadrons from dijets for 0.4 &lt; $p_T$ &lt; 10 GeV/$c$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. With increasing $p_T$, the away-side distribution evolves from a broad to a concave shape, then to a convex shape. Comparisons to $p$+$p$ data suggest that the away-side can be divided into a partially suppressed "head" region centered at $\Delta\phi$ ~ $\pi$, and an enhanced "shoulder" region centered at $\Delta\phi$ ~ $\pi$ +/- 1.1. The $p_T$ spectrum for the "head" region softens toward central collisions, consistent with the onset of jet quenching. The spectral slope for the "shoulder" region is independent of centrality and trigger $p_T$, which offers constraints on energy transport mechanisms and suggests that the "shoulder" region contains the medium response to energetic jets.
DOI: 10.17182/hepdata.143605.v1/t4
title: "Figure 3a" of "Transverse momentum and centrality dependence of dihadron correlations in Au+Au collisions at sqrt(s_NN)=200 GeV: Jet-quenching and the response of partonic matter"

description: $I_{AA}$ versus $p_T^B$ for four trigger $p_T$ bins in HR+SR ($|\Delta\phi - \pi|$ &lt; $\pi/2$) and HR ($|\Delta\phi - \pi|$ &lt; $\pi/6$).
description: Azimuthal angle ($\Delta\phi$) correlations are presented for charged hadrons from dijets for 0.4 &lt; $p_T$ &lt; 10 GeV/$c$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. With increasing $p_T$, the away-side distribution evolves from a broad to a concave shape, then to a convex shape. Comparisons to $p$+$p$ data suggest that the away-side can be divided into a partially suppressed "head" region centered at $\Delta\phi$ ~ $\pi$, and an enhanced "shoulder" region centered at $\Delta\phi$ ~ $\pi$ +/- 1.1. The $p_T$ spectrum for the "head" region softens toward central collisions, consistent with the onset of jet quenching. The spectral slope for the "shoulder" region is independent of centrality and trigger $p_T$, which offers constraints on energy transport mechanisms and suggests that the "shoulder" region contains the medium response to energetic jets.
DOI: 10.17182/hepdata.143605.v1/t5
title: "Figure 3b" of "Transverse momentum and centrality dependence of dihadron correlations in Au+Au collisions at sqrt(s_NN)=200 GeV: Jet-quenching and the response of partonic matter"

description: $I_{AA}$ versus $p_T^B$ for four trigger $p_T$ bins in HR+SR ($|\Delta\phi - \pi|$ &lt; $\pi/2$) and HR ($|\Delta\phi - \pi|$ &lt; $\pi/6$).
description: Azimuthal angle ($\Delta\phi$) correlations are presented for charged hadrons from dijets for 0.4 &lt; $p_T$ &lt; 10 GeV/$c$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. With increasing $p_T$, the away-side distribution evolves from a broad to a concave shape, then to a convex shape. Comparisons to $p$+$p$ data suggest that the away-side can be divided into a partially suppressed "head" region centered at $\Delta\phi$ ~ $\pi$, and an enhanced "shoulder" region centered at $\Delta\phi$ ~ $\pi$ +/- 1.1. The $p_T$ spectrum for the "head" region softens toward central collisions, consistent with the onset of jet quenching. The spectral slope for the "shoulder" region is independent of centrality and trigger $p_T$, which offers constraints on energy transport mechanisms and suggests that the "shoulder" region contains the medium response to energetic jets.
DOI: 10.17182/hepdata.143605.v1/t6
title: "Figure 4" of "Transverse momentum and centrality dependence of dihadron correlations in Au+Au collisions at sqrt(s_NN)=200 GeV: Jet-quenching and the response of partonic matter"

description: Truncated mean $$ in 1 &lt; $p_T^B$ &lt; 5 GeV/$c$ versus $N_{part}$ for the near-side, away-side shoulder, and head regions for Au+Au and $p$+$p$ for three trigger $p_T$ bins.
description: Azimuthal angle ($\Delta\phi$) correlations are presented for charged hadrons from dijets for 0.4 &lt; $p_T$ &lt; 10 GeV/$c$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. With increasing $p_T$, the away-side distribution evolves from a broad to a concave shape, then to a convex shape. Comparisons to $p$+$p$ data suggest that the away-side can be divided into a partially suppressed "head" region centered at $\Delta\phi$ ~ $\pi$, and an enhanced "shoulder" region centered at $\Delta\phi$ ~ $\pi$ +/- 1.1. The $p_T$ spectrum for the "head" region softens toward central collisions, consistent with the onset of jet quenching. The spectral slope for the "shoulder" region is independent of centrality and trigger $p_T$, which offers constraints on energy transport mechanisms and suggests that the "shoulder" region contains the medium response to energetic jets.
DOI: 10.17182/hepdata.143606.v1/t1
title: "Table 1" of "Systematic Studies of Elliptic Flow Measurements in Au+Au Collisions at sqrt(s_NN) = 200 GeV"

description: Centrality classes and average number of participant nucleons $\langle N_{part} \rangle$ obtained from a Glauber Monte Carlo simulation of the BBC and ZDC responses for Au+Au collision at $\sqrt{s_{NN}}$ = 200 GeV.
description: We present inclusive charged hadron elliptic flow ($v_2$) measured over the pseudorapidity range $|\eta|$ &lt; 0.35 in Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Results for $v_2$ are presented over a broad range of transverse momentum ($p_{T}$ = 0.2-8.0 GeV/$c$) and centrality (0-60%). To study nonflow effects that are correlations other than collective flow, as well as the fluctuations of $v_2$, we compare two different analysis methods: (1) the event-plane method from two independent subdetectors at forward ($|\eta|$ = 3.1–3.9) and beam ($|\eta|$ &gt; 6.5) pseudorapidities and (2) the two-particle cumulant method extracted using correlations between particles detected at midrapidity. The two event-plane results are consistent within systematic uncertainties over the measured $p_T$ and in centrality 0–40%. There is at most a 20% difference in the $v_2$ between the two event-plane methods in peripheral (40–60%) collisions. The comparisons between the two-particle cumulant results and the standard event-plane measurements are discussed.
DOI: 10.17182/hepdata.143606.v1/t2
title: "Figure 15" of "Systematic Studies of Elliptic Flow Measurements in Au+Au Collisions at sqrt(s_NN) = 200 GeV"

description: Comparison of Res{$\Psi_n$;X} and Res{$\Psi_n$;Y} with Res{$\Psi_n$} for the BBC event plane and ZDC-SMD event plane as a function of centrality.
description: We present inclusive charged hadron elliptic flow ($v_2$) measured over the pseudorapidity range $|\eta|$ &lt; 0.35 in Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Results for $v_2$ are presented over a broad range of transverse momentum ($p_{T}$ = 0.2-8.0 GeV/$c$) and centrality (0-60%). To study nonflow effects that are correlations other than collective flow, as well as the fluctuations of $v_2$, we compare two different analysis methods: (1) the event-plane method from two independent subdetectors at forward ($|\eta|$ = 3.1–3.9) and beam ($|\eta|$ &gt; 6.5) pseudorapidities and (2) the two-particle cumulant method extracted using correlations between particles detected at midrapidity. The two event-plane results are consistent within systematic uncertainties over the measured $p_T$ and in centrality 0–40%. There is at most a 20% difference in the $v_2$ between the two event-plane methods in peripheral (40–60%) collisions. The comparisons between the two-particle cumulant results and the standard event-plane measurements are discussed.
DOI: 10.17182/hepdata.143606.v1/t3
title: "Figure 18a-1" of "Systematic Studies of Elliptic Flow Measurements in Au+Au Collisions at sqrt(s_NN) = 200 GeV"

description: Charged hadron $v_2$($p_T$) in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV from the two-particle cumulant method, the BBC event plane, and the ZDC-SMD event plane for the indicated centralities.
description: We present inclusive charged hadron elliptic flow ($v_2$) measured over the pseudorapidity range $|\eta|$ &lt; 0.35 in Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Results for $v_2$ are presented over a broad range of transverse momentum ($p_{T}$ = 0.2-8.0 GeV/$c$) and centrality (0-60%). To study nonflow effects that are correlations other than collective flow, as well as the fluctuations of $v_2$, we compare two different analysis methods: (1) the event-plane method from two independent subdetectors at forward ($|\eta|$ = 3.1–3.9) and beam ($|\eta|$ &gt; 6.5) pseudorapidities and (2) the two-particle cumulant method extracted using correlations between particles detected at midrapidity. The two event-plane results are consistent within systematic uncertainties over the measured $p_T$ and in centrality 0–40%. There is at most a 20% difference in the $v_2$ between the two event-plane methods in peripheral (40–60%) collisions. The comparisons between the two-particle cumulant results and the standard event-plane measurements are discussed.
DOI: 10.17182/hepdata.143606.v1/t4
title: "Figure 18a-2" of "Systematic Studies of Elliptic Flow Measurements in Au+Au Collisions at sqrt(s_NN) = 200 GeV"

description: Charged hadron $v_2$($p_T$) in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV from the two-particle cumulant method, the BBC event plane, and the ZDC-SMD event plane for the indicated centralities.
description: We present inclusive charged hadron elliptic flow ($v_2$) measured over the pseudorapidity range $|\eta|$ &lt; 0.35 in Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Results for $v_2$ are presented over a broad range of transverse momentum ($p_{T}$ = 0.2-8.0 GeV/$c$) and centrality (0-60%). To study nonflow effects that are correlations other than collective flow, as well as the fluctuations of $v_2$, we compare two different analysis methods: (1) the event-plane method from two independent subdetectors at forward ($|\eta|$ = 3.1–3.9) and beam ($|\eta|$ &gt; 6.5) pseudorapidities and (2) the two-particle cumulant method extracted using correlations between particles detected at midrapidity. The two event-plane results are consistent within systematic uncertainties over the measured $p_T$ and in centrality 0–40%. There is at most a 20% difference in the $v_2$ between the two event-plane methods in peripheral (40–60%) collisions. The comparisons between the two-particle cumulant results and the standard event-plane measurements are discussed.