cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.141853.v1/t7
title: "Figure 12b" of "A detailed study of high-p(T) neutral pion suppression and azimuthal anisotropy in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: $$ for $\pi^0$ yields integrated over 3 &lt; $p_T$ &lt; 5 GeV/$c$.
description: Measurements of neutral pion $(\pi^0)$ production at midrapidity in $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions as a function of transverse momentum, $p_T$, collision centrality, and angle with respect to reaction plane are presented. The data represent the final $\pi^0$ results from the PHENIX experiment for the first RHIC Au+Au run at design center-of-mass-energy. They include additional data obtained using the PHENIX Level-2 trigger with more than a factor of three increase in statistics over previously published results for $p_T$ &gt; 6 GeV/$c$. We evaluate the suppression in the yield of high-$p_T$ $\pi^0$'s relative to point-like scaling expectations using the nuclear modification factor $R_{AA}$. We present the $p_T$ dependence of $R_{AA}$ for nine bins in collision centrality. We separately integrate $R_{AA}$ over larger $p_T$ bins to show more precisely the centrality dependence of the high-$p_T$ suppression. We then evaluate the dependence of the high-$p_T$ suppression on the emission angle $\Delta\phi$ of the pions with respect to event reaction plane for $7$ bins in collision centrality. We show that the yields of high-$p_T$ $\pi^0$'s vary strongly with $\Delta\phi$, consistent with prior measurements. We show that this variation persists in the most peripheral bin accessible in this analysis. For the peripheral bins we observe no suppression for neutral pions produced aligned with the reaction plane while the yield of $\pi^0$'s produced perpendicular to the reaction plane is suppressed by more than a factor of $~ 2$. We analyze the combined centrality and $\Delta\phi$ dependence of the $\pi^0$ suppression in different $p_T$ bins using different possible descriptions of parton energy loss dependence on jet path-length averages to determine whether a single geometric picture can explain the observed suppression pattern.
DOI: 10.17182/hepdata.141853.v1/t8
title: "Figure 13a" of "A detailed study of high-p(T) neutral pion suppression and azimuthal anisotropy in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: $R_{AA}$ vs. $\Delta\phi$ for $\pi^0$ yields integrated over 5 &lt; $p_T$ &lt; 8 GeV/$c$.
description: Measurements of neutral pion $(\pi^0)$ production at midrapidity in $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions as a function of transverse momentum, $p_T$, collision centrality, and angle with respect to reaction plane are presented. The data represent the final $\pi^0$ results from the PHENIX experiment for the first RHIC Au+Au run at design center-of-mass-energy. They include additional data obtained using the PHENIX Level-2 trigger with more than a factor of three increase in statistics over previously published results for $p_T$ &gt; 6 GeV/$c$. We evaluate the suppression in the yield of high-$p_T$ $\pi^0$'s relative to point-like scaling expectations using the nuclear modification factor $R_{AA}$. We present the $p_T$ dependence of $R_{AA}$ for nine bins in collision centrality. We separately integrate $R_{AA}$ over larger $p_T$ bins to show more precisely the centrality dependence of the high-$p_T$ suppression. We then evaluate the dependence of the high-$p_T$ suppression on the emission angle $\Delta\phi$ of the pions with respect to event reaction plane for $7$ bins in collision centrality. We show that the yields of high-$p_T$ $\pi^0$'s vary strongly with $\Delta\phi$, consistent with prior measurements. We show that this variation persists in the most peripheral bin accessible in this analysis. For the peripheral bins we observe no suppression for neutral pions produced aligned with the reaction plane while the yield of $\pi^0$'s produced perpendicular to the reaction plane is suppressed by more than a factor of $~ 2$. We analyze the combined centrality and $\Delta\phi$ dependence of the $\pi^0$ suppression in different $p_T$ bins using different possible descriptions of parton energy loss dependence on jet path-length averages to determine whether a single geometric picture can explain the observed suppression pattern.
DOI: 10.17182/hepdata.141853.v1/t9
title: "Figure 13b" of "A detailed study of high-p(T) neutral pion suppression and azimuthal anisotropy in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: $$ for $\pi^0$ yields integrated over 5 &lt; $p_T$ &lt; 8 GeV/$c$.
description: Measurements of neutral pion $(\pi^0)$ production at midrapidity in $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions as a function of transverse momentum, $p_T$, collision centrality, and angle with respect to reaction plane are presented. The data represent the final $\pi^0$ results from the PHENIX experiment for the first RHIC Au+Au run at design center-of-mass-energy. They include additional data obtained using the PHENIX Level-2 trigger with more than a factor of three increase in statistics over previously published results for $p_T$ &gt; 6 GeV/$c$. We evaluate the suppression in the yield of high-$p_T$ $\pi^0$'s relative to point-like scaling expectations using the nuclear modification factor $R_{AA}$. We present the $p_T$ dependence of $R_{AA}$ for nine bins in collision centrality. We separately integrate $R_{AA}$ over larger $p_T$ bins to show more precisely the centrality dependence of the high-$p_T$ suppression. We then evaluate the dependence of the high-$p_T$ suppression on the emission angle $\Delta\phi$ of the pions with respect to event reaction plane for $7$ bins in collision centrality. We show that the yields of high-$p_T$ $\pi^0$'s vary strongly with $\Delta\phi$, consistent with prior measurements. We show that this variation persists in the most peripheral bin accessible in this analysis. For the peripheral bins we observe no suppression for neutral pions produced aligned with the reaction plane while the yield of $\pi^0$'s produced perpendicular to the reaction plane is suppressed by more than a factor of $~ 2$. We analyze the combined centrality and $\Delta\phi$ dependence of the $\pi^0$ suppression in different $p_T$ bins using different possible descriptions of parton energy loss dependence on jet path-length averages to determine whether a single geometric picture can explain the observed suppression pattern.
DOI: 10.17182/hepdata.141854.v1/t1
title: "Table 1" of "Search for the $Z\gamma$ decay mode of new high-mass resonances in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector"

description: The main sources of systematic uncertainty for the $X\to Z \gamma$ search. The gluon-gluon fusion spin-0 signal samples produced at $m_{X} = [220-3400]$ GeV are used to evaluate the systematic uncertainty. The ranges for the uncertainties span the variations among different categories and different $m_{X}$ resonance masses. The uncertainty due to the spurious signal uncertainty is reported as the absolute number of events. In the table, "ID" for photon and electrons refers to identification efficiency uncertainties, "ISO" refers to isolation efficiency uncertainties, "TRIG" refers to trigger efficiency uncertainties, "RECO" refers to muon reconstruction efficiency uncertainty and "TTVA" refers to muon track-to-vertex-association efficiency uncertainty.
description: CERN-LHC, ATLAS. Measurements of the fiducial and total cross sections for Z production using the electron and muon final states in proton-proton collisions at a centre-of-mass energy of 13 TeV with 3.2 fb^-1 of data collected in 2015. Measurements of single and double fiducial and total cross-section ratios for ttbar and Z production at 13, 8, and 7TeV.
DOI: 10.17182/hepdata.141854.v1/t2
title: "Table 2" of "Search for the $Z\gamma$ decay mode of new high-mass resonances in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector"

description: The observed (expected) upper limits of $\sigma(pp\to X)\cdot\mathcal{B}(X\to Z\gamma)$ for spin-0 and spin-2 heavy resonances at 95\% CL. $m_{X}$ varies from 220 GeV to 3400~\GeV.
description: CERN-LHC, ATLAS. Measurements of the fiducial and total cross sections for Z production using the electron and muon final states in proton-proton collisions at a centre-of-mass energy of 13 TeV with 3.2 fb^-1 of data collected in 2015. Measurements of single and double fiducial and total cross-section ratios for ttbar and Z production at 13, 8, and 7TeV.
DOI: 10.17182/hepdata.141854.v1/t3
title: "Table 3" of "Search for the $Z\gamma$ decay mode of new high-mass resonances in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector"

description: Impacts of grouped dominant systematic uncertainties. The impact corresponds to the relative variation of the asymptotic expected upper limit of $\sigma(pp \rightarrow X) \times BR(X \rightarrow Z\gamma)$ from $m_{X}=220$ GeV to $m_{X}=3.4$ TeV when re-evaluating the quantity by fixing the corresponding nuisance parameters to the best-fit values, while keeping others free to float. The impact of total systematic uncertainties are performed in the last row.
description: CERN-LHC, ATLAS. Measurements of the fiducial and total cross sections for Z production using the electron and muon final states in proton-proton collisions at a centre-of-mass energy of 13 TeV with 3.2 fb^-1 of data collected in 2015. Measurements of single and double fiducial and total cross-section ratios for ttbar and Z production at 13, 8, and 7TeV.
DOI: 10.17182/hepdata.141854.v1/t4
title: "Table 4" of "Search for the $Z\gamma$ decay mode of new high-mass resonances in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector"

description: Observed (solid line) and expected (dashed line) 95\% CL limits on the product of the production cross section times the branching ratio of a narrow width spin-0 resonance $X$ produced via gluon-gluon initial states decaying to a $Z$ boson and a photon, $\sigma(pp\to X)\cdot\mathcal{B}(X\to Z\gamma)$, as a function of the resonance mass $m_{X}$. Observed (expected) results are derived from ensemble tests for $m_{X}&gt;1850 (900)$~\GeV. The green and yellow solid bands correspond to the $\pm1\sigma$ and $\pm2\sigma$ intervals for the expected upper limits. The limits in the $m_{X}$ ranges from 220 GeV to 3400 GeV and are obtained from the combined $ee\gamma$ and $\mu\mu\gamma$ channels.
description: CERN-LHC, ATLAS. Measurements of the fiducial and total cross sections for Z production using the electron and muon final states in proton-proton collisions at a centre-of-mass energy of 13 TeV with 3.2 fb^-1 of data collected in 2015. Measurements of single and double fiducial and total cross-section ratios for ttbar and Z production at 13, 8, and 7TeV.
DOI: 10.17182/hepdata.141854.v1/t5
title: "Table 5" of "Search for the $Z\gamma$ decay mode of new high-mass resonances in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector"

description: Observed (solid line) and expected (dashed line) 95\% CL limits on the product of the production cross section times the branching ratio of a narrow width spin-2 resonance $X$ produced via gluon-gluon initial states decaying to a $Z$ boson and a photon, $\sigma(pp\to X)\cdot\mathcal{B}(X\to Z\gamma)$, as a function of the resonance mass $m_{X}$. Observed (expected) results are derived from ensemble tests for $m_{X}&gt;1850 (900)$~\GeV. The green and yellow solid bands correspond to the $\pm1\sigma$ and $\pm2\sigma$ intervals for the expected upper limit respectively. The limits in the $m_{X}$ ranges from 220 GeV to 3400 GeV and are obtained from the combined $ee\gamma$ and $\mu\mu\gamma$ channels..
description: CERN-LHC, ATLAS. Measurements of the fiducial and total cross sections for Z production using the electron and muon final states in proton-proton collisions at a centre-of-mass energy of 13 TeV with 3.2 fb^-1 of data collected in 2015. Measurements of single and double fiducial and total cross-section ratios for ttbar and Z production at 13, 8, and 7TeV.
DOI: 10.17182/hepdata.141854.v1/t6
title: "Table 6" of "Search for the $Z\gamma$ decay mode of new high-mass resonances in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector"

description: Observed (solid line) and expected (dashed line) 95\% CL limits on the product of the production cross section times the branching ratio of a narrow width spin-2 resonance $X$ produced via $q\bar{q}$ initial states decaying to a $Z$ boson and a photon, $\sigma(pp\to X)\cdot\mathcal{B}(X\to Z\gamma)$, as a function of the resonance mass $m_{X}$. Observed (expected) results are derived from ensemble tests for $m_{X}&gt;1850 (900)$~\GeV. The green and yellow solid bands correspond to the $\pm1\sigma$ and $\pm2\sigma$ intervals for the expected upper limit respectively. The limits in the $m_{X}$ ranges from 220 GeV to 3400 GeV and are obtained from the combined $ee\gamma$ and $\mu\mu\gamma$ channels.
description: CERN-LHC, ATLAS. Measurements of the fiducial and total cross sections for Z production using the electron and muon final states in proton-proton collisions at a centre-of-mass energy of 13 TeV with 3.2 fb^-1 of data collected in 2015. Measurements of single and double fiducial and total cross-section ratios for ttbar and Z production at 13, 8, and 7TeV.
DOI: 10.17182/hepdata.141855.v1/t1
title: "Figure 1a" of "Common suppression pattern of eta and pi0 mesons at high transverse momentum in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: Invariant $\eta$ yields as a function of transverse momentum for 3 centralities and MB Au+Au at $\sqrt{s_{NN}}$ = 200 GeV.
description: Inclusive transverse momentum spectra of $\eta$ mesons have been measured within $p_T$ = 2-10 GeV/$c$ at mid-rapidity by the PHENIX experiment in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. In central Au+Au the $\eta$ yields are significantly suppressed compared to peripheral Au+Au, d+Au and p+p yields scaled by the corresponding number of nucleon-nucleon collisions. The magnitude, centrality and $p_T$ dependence of the suppression is common, within errors, for $\eta$ and $\pi^0$. The ratio of $\eta$ to $\pi^0$ spectra at high $p_T$ amounts to 0.40 &lt; $R_{\eta/\pi^0}$ &lt; 0.48 for the three systems in agreement with the world average measured in hadronic and nuclear reactions and, at large scaled momentum, in $e^+e^-$ collisions.
DOI: 10.17182/hepdata.141855.v1/t2
title: "Figure 1b" of "Common suppression pattern of eta and pi0 mesons at high transverse momentum in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: Invariant $\eta$ yields as a function of transverse momentum for 3 centralities and MB Au+Au at $\sqrt{s_{NN}}$ = 200 GeV.
description: Inclusive transverse momentum spectra of $\eta$ mesons have been measured within $p_T$ = 2-10 GeV/$c$ at mid-rapidity by the PHENIX experiment in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. In central Au+Au the $\eta$ yields are significantly suppressed compared to peripheral Au+Au, d+Au and p+p yields scaled by the corresponding number of nucleon-nucleon collisions. The magnitude, centrality and $p_T$ dependence of the suppression is common, within errors, for $\eta$ and $\pi^0$. The ratio of $\eta$ to $\pi^0$ spectra at high $p_T$ amounts to 0.40 &lt; $R_{\eta/\pi^0}$ &lt; 0.48 for the three systems in agreement with the world average measured in hadronic and nuclear reactions and, at large scaled momentum, in $e^+e^-$ collisions.
DOI: 10.17182/hepdata.141855.v1/t3
title: "Figure 2a" of "Common suppression pattern of eta and pi0 mesons at high transverse momentum in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: Nuclear modification factors for $\eta$ in Au+Au centralities.
description: Inclusive transverse momentum spectra of $\eta$ mesons have been measured within $p_T$ = 2-10 GeV/$c$ at mid-rapidity by the PHENIX experiment in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. In central Au+Au the $\eta$ yields are significantly suppressed compared to peripheral Au+Au, d+Au and p+p yields scaled by the corresponding number of nucleon-nucleon collisions. The magnitude, centrality and $p_T$ dependence of the suppression is common, within errors, for $\eta$ and $\pi^0$. The ratio of $\eta$ to $\pi^0$ spectra at high $p_T$ amounts to 0.40 &lt; $R_{\eta/\pi^0}$ &lt; 0.48 for the three systems in agreement with the world average measured in hadronic and nuclear reactions and, at large scaled momentum, in $e^+e^-$ collisions.
DOI: 10.17182/hepdata.141855.v1/t4
title: "Figure 2b" of "Common suppression pattern of eta and pi0 mesons at high transverse momentum in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: Nuclear modification factors for $\eta$ in Au+Au centralities.
description: Inclusive transverse momentum spectra of $\eta$ mesons have been measured within $p_T$ = 2-10 GeV/$c$ at mid-rapidity by the PHENIX experiment in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. In central Au+Au the $\eta$ yields are significantly suppressed compared to peripheral Au+Au, d+Au and p+p yields scaled by the corresponding number of nucleon-nucleon collisions. The magnitude, centrality and $p_T$ dependence of the suppression is common, within errors, for $\eta$ and $\pi^0$. The ratio of $\eta$ to $\pi^0$ spectra at high $p_T$ amounts to 0.40 &lt; $R_{\eta/\pi^0}$ &lt; 0.48 for the three systems in agreement with the world average measured in hadronic and nuclear reactions and, at large scaled momentum, in $e^+e^-$ collisions.
DOI: 10.17182/hepdata.141855.v1/t5
title: "Figure 2c" of "Common suppression pattern of eta and pi0 mesons at high transverse momentum in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: Nuclear modification factors for $\eta$ in Au+Au centralities.
description: Inclusive transverse momentum spectra of $\eta$ mesons have been measured within $p_T$ = 2-10 GeV/$c$ at mid-rapidity by the PHENIX experiment in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. In central Au+Au the $\eta$ yields are significantly suppressed compared to peripheral Au+Au, d+Au and p+p yields scaled by the corresponding number of nucleon-nucleon collisions. The magnitude, centrality and $p_T$ dependence of the suppression is common, within errors, for $\eta$ and $\pi^0$. The ratio of $\eta$ to $\pi^0$ spectra at high $p_T$ amounts to 0.40 &lt; $R_{\eta/\pi^0}$ &lt; 0.48 for the three systems in agreement with the world average measured in hadronic and nuclear reactions and, at large scaled momentum, in $e^+e^-$ collisions.
DOI: 10.17182/hepdata.141855.v1/t10
title: "Figure 4c" of "Common suppression pattern of eta and pi0 mesons at high transverse momentum in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: $\eta/\pi^0$ ratio in Au+Au compared to the ratio in p+p and d+Au at $\sqrt{s_{NN}}$ = 200 GeV.
description: Inclusive transverse momentum spectra of $\eta$ mesons have been measured within $p_T$ = 2-10 GeV/$c$ at mid-rapidity by the PHENIX experiment in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. In central Au+Au the $\eta$ yields are significantly suppressed compared to peripheral Au+Au, d+Au and p+p yields scaled by the corresponding number of nucleon-nucleon collisions. The magnitude, centrality and $p_T$ dependence of the suppression is common, within errors, for $\eta$ and $\pi^0$. The ratio of $\eta$ to $\pi^0$ spectra at high $p_T$ amounts to 0.40 &lt; $R_{\eta/\pi^0}$ &lt; 0.48 for the three systems in agreement with the world average measured in hadronic and nuclear reactions and, at large scaled momentum, in $e^+e^-$ collisions.
DOI: 10.17182/hepdata.141855.v1/t6
title: "Figure 3a" of "Common suppression pattern of eta and pi0 mesons at high transverse momentum in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: $R_{AA} (p_T)$ measured in central Au+Au at $\sqrt{s_{NN}}$ = 200 GeV for $\eta, \pi^0$, and direct $\gamma$. Points with no error are the upper limit. Point-to-point uncorrelated uncertainties are called "sys-uncorr", point-to-point correlated uncertainties are called "sys-corr", and normalization uncertainties are called "sys-norm."
description: Inclusive transverse momentum spectra of $\eta$ mesons have been measured within $p_T$ = 2-10 GeV/$c$ at mid-rapidity by the PHENIX experiment in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. In central Au+Au the $\eta$ yields are significantly suppressed compared to peripheral Au+Au, d+Au and p+p yields scaled by the corresponding number of nucleon-nucleon collisions. The magnitude, centrality and $p_T$ dependence of the suppression is common, within errors, for $\eta$ and $\pi^0$. The ratio of $\eta$ to $\pi^0$ spectra at high $p_T$ amounts to 0.40 &lt; $R_{\eta/\pi^0}$ &lt; 0.48 for the three systems in agreement with the world average measured in hadronic and nuclear reactions and, at large scaled momentum, in $e^+e^-$ collisions.
DOI: 10.17182/hepdata.141855.v1/t7
title: "Figure 3b" of "Common suppression pattern of eta and pi0 mesons at high transverse momentum in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: $R_{AA} (p_T)$ measured in central Au+Au at $\sqrt{s_{NN}}$ = 200 GeV for $\eta, \pi^0$, and direct $\gamma$. Points with no error are the upper limit. Point-to-point uncorrelated uncertainties are called "sys-uncorr", point-to-point correlated uncertainties are called "sys-corr", and normalization uncertainties are called "sys-norm."
description: Inclusive transverse momentum spectra of $\eta$ mesons have been measured within $p_T$ = 2-10 GeV/$c$ at mid-rapidity by the PHENIX experiment in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. In central Au+Au the $\eta$ yields are significantly suppressed compared to peripheral Au+Au, d+Au and p+p yields scaled by the corresponding number of nucleon-nucleon collisions. The magnitude, centrality and $p_T$ dependence of the suppression is common, within errors, for $\eta$ and $\pi^0$. The ratio of $\eta$ to $\pi^0$ spectra at high $p_T$ amounts to 0.40 &lt; $R_{\eta/\pi^0}$ &lt; 0.48 for the three systems in agreement with the world average measured in hadronic and nuclear reactions and, at large scaled momentum, in $e^+e^-$ collisions.
DOI: 10.17182/hepdata.141855.v1/t8
title: "Figure 4a" of "Common suppression pattern of eta and pi0 mesons at high transverse momentum in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: $\eta/\pi^0$ ratio in Au+Au compared to the ratio in p+p and d+Au at $\sqrt{s_{NN}}$ = 200 GeV.
description: Inclusive transverse momentum spectra of $\eta$ mesons have been measured within $p_T$ = 2-10 GeV/$c$ at mid-rapidity by the PHENIX experiment in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. In central Au+Au the $\eta$ yields are significantly suppressed compared to peripheral Au+Au, d+Au and p+p yields scaled by the corresponding number of nucleon-nucleon collisions. The magnitude, centrality and $p_T$ dependence of the suppression is common, within errors, for $\eta$ and $\pi^0$. The ratio of $\eta$ to $\pi^0$ spectra at high $p_T$ amounts to 0.40 &lt; $R_{\eta/\pi^0}$ &lt; 0.48 for the three systems in agreement with the world average measured in hadronic and nuclear reactions and, at large scaled momentum, in $e^+e^-$ collisions.
DOI: 10.17182/hepdata.141855.v1/t9
title: "Figure 4b" of "Common suppression pattern of eta and pi0 mesons at high transverse momentum in Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: $\eta/\pi^0$ ratio in Au+Au compared to the ratio in p+p and d+Au at $\sqrt{s_{NN}}$ = 200 GeV.
description: Inclusive transverse momentum spectra of $\eta$ mesons have been measured within $p_T$ = 2-10 GeV/$c$ at mid-rapidity by the PHENIX experiment in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. In central Au+Au the $\eta$ yields are significantly suppressed compared to peripheral Au+Au, d+Au and p+p yields scaled by the corresponding number of nucleon-nucleon collisions. The magnitude, centrality and $p_T$ dependence of the suppression is common, within errors, for $\eta$ and $\pi^0$. The ratio of $\eta$ to $\pi^0$ spectra at high $p_T$ amounts to 0.40 &lt; $R_{\eta/\pi^0}$ &lt; 0.48 for the three systems in agreement with the world average measured in hadronic and nuclear reactions and, at large scaled momentum, in $e^+e^-$ collisions.