cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.145190.v1/t109
title: "Figure 45d pt.2" of "Detailed measurement of the $e^+ e^-$ pair continuum in $p+p$ and Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV and implications for direct photon production"

description: Invariant mass spectrum of $e^{+}e^{-}$ pairs in MB Au+Au for different $p_{T}$ ranges compared to predictions from Elena Bratkovskaya (1.5&lt;$p_{T}$&lt;2.0 GeV/$c$). Invariant mass spectra of $e^{+}e^{−}$ pairs in Min. Bias Au + Au collisions for different $p_{T}$ windows collisions compared to the expectations from the calculations of Cassing and Bratkovskaya [20, 27, 86, 87], separately showing the partonic and the hadronic yields calculated with different implementations of the $\rho$ spectral function, namely according to collisional broadening, with or without a dropping mass scenario. The calculations which include the dropping mass scenario have been added to the cocktail of hadronic decays (which is calculated by the HSD model itself) and charmed meson decays products.
description: PHENIX has measured the $e^{+}e^{-}$ pair continuum in $\sqrt{s_{NN}}$=200 GeV Au+Au and $p+p$ collisions over a wide range of mass and transverse momenta. The $e^{+}e^{-}$ yield is compared to the expectations from hadronic sources, based on PHENIX measurements. In the intermediate mass region, between the masses of the $\phi$ and the $J/\psi$ meson, the yield is consistent with expectations from correlated $c\bar c$ production, though other mechanisms are not ruled out. In the low mass region (below the $\phi$) the $p+p$ inclusive mass spectrum is well described by known contributions from light meson decays. In contrast, the Au+Au minimum bias inclusive mass spectrum in this region shows an enhancement by a factor of $4.7\pm 0.4^{stat}\pm 1.5^{syst}\pm 0.9^{model}$ At low mass ($m_{ee}$&lt;0.3 GeV/$c^{2}$) and high $p_{T}$ (1&lt;$p_{T}$&lt;5 GeV/$c$) an enhanced $e^{+}e^{-}$ pair yield is observed that is consistent with production of virtual direct photons. This excess is used to infer the yield of real direct photons. In central Au+Au collisions, the excess of the direct photon yield over the $p+p$ is exponential in $p_{T}$, with inverse slope $T = 221\pm 19^{stat}\pm 19^{syst}$ MeV. Hydrodynamical models with initial temperatures ranging from $T_{init} \cong$300--600 MeV at times of 0.6--0.15 fm/$c$ after the collision are in qualitative agreement with the direct photon data in Au+Au. For low $p_{T}$&lt;1 GeV/$c$ the low mass region shows a further significant enhancement that increases with centrality and has an inverse slope of $T\cong$100 MeV. Theoretical models under predict the low mass, low $p_{T}$ enhancement. Error values of 9.99E+9 represent upper limit errors.
DOI: 10.17182/hepdata.145190.v1/t110
title: "Figure 46a" of "Detailed measurement of the $e^+ e^-$ pair continuum in $p+p$ and Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV and implications for direct photon production"

description: Subtracted $p_{T}$ spectrum in 300-750 compared to calculations from Ralf Rapp. $p_{T}$ spectra of $e^{+}e^{−}$ pairs for 0.3 &lt; $m_{ee}$ &lt; 0.75 GeV/$c^{2}$ in Min. Bias Au + Au collisions compared to the expectations from the calculations of respectively R. Rapp and van Hees [15, 18, 83], Dusling and Zahed [19, 84, 85], Cassing and Bratkovskaya [20, 27, 86, 87]. The spectra are fully acceptance corrected. The curves show separately partonic and hadronic yields. For the curves of Rapp and van Hees [15, 18, 83] the two scenarios: Hadron Many Body Theory (HMBT) and Dropping Mass (DM) are shown. The sum is calculated with HMBT. The calculations are compared to the data from which the contributions of the cocktail of hadronic decays and charmed meson decays have been subtracted.
description: PHENIX has measured the $e^{+}e^{-}$ pair continuum in $\sqrt{s_{NN}}$=200 GeV Au+Au and $p+p$ collisions over a wide range of mass and transverse momenta. The $e^{+}e^{-}$ yield is compared to the expectations from hadronic sources, based on PHENIX measurements. In the intermediate mass region, between the masses of the $\phi$ and the $J/\psi$ meson, the yield is consistent with expectations from correlated $c\bar c$ production, though other mechanisms are not ruled out. In the low mass region (below the $\phi$) the $p+p$ inclusive mass spectrum is well described by known contributions from light meson decays. In contrast, the Au+Au minimum bias inclusive mass spectrum in this region shows an enhancement by a factor of $4.7\pm 0.4^{stat}\pm 1.5^{syst}\pm 0.9^{model}$ At low mass ($m_{ee}$&lt;0.3 GeV/$c^{2}$) and high $p_{T}$ (1&lt;$p_{T}$&lt;5 GeV/$c$) an enhanced $e^{+}e^{-}$ pair yield is observed that is consistent with production of virtual direct photons. This excess is used to infer the yield of real direct photons. In central Au+Au collisions, the excess of the direct photon yield over the $p+p$ is exponential in $p_{T}$, with inverse slope $T = 221\pm 19^{stat}\pm 19^{syst}$ MeV. Hydrodynamical models with initial temperatures ranging from $T_{init} \cong$300--600 MeV at times of 0.6--0.15 fm/$c$ after the collision are in qualitative agreement with the direct photon data in Au+Au. For low $p_{T}$&lt;1 GeV/$c$ the low mass region shows a further significant enhancement that increases with centrality and has an inverse slope of $T\cong$100 MeV. Theoretical models under predict the low mass, low $p_{T}$ enhancement. Error values of 9.99E+9 represent upper limit errors.
DOI: 10.17182/hepdata.145190.v1/t111
title: "Figure 46b" of "Detailed measurement of the $e^+ e^-$ pair continuum in $p+p$ and Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV and implications for direct photon production"

description: Subtracted $p_{T}$ spectrum in 300-750 compared to calculations from Kevin Dusling. $p_{T}$ spectra of $e^{+}e^{−}$ pairs for 0.3 &lt; $m_{ee}$ &lt; 0.75 GeV/$c^{2}$ in Min. Bias Au + Au collisions compared to the expectations from the calculations of respectively R. Rapp and van Hees [15, 18, 83], Dusling and Zahed [19, 84, 85], Cassing and Bratkovskaya [20, 27, 86, 87]. The spectra are fully acceptance corrected. The curves show separately partonic and hadronic yields. For the curves of Rapp and van Hees [15, 18, 83] the two scenarios: Hadron Many Body Theory (HMBT) and Dropping Mass (DM) are shown. The sum is calculated with HMBT. The calculations are compared to the data from which the contributions of the cocktail of hadronic decays and charmed meson decays have been subtracted.
description: PHENIX has measured the $e^{+}e^{-}$ pair continuum in $\sqrt{s_{NN}}$=200 GeV Au+Au and $p+p$ collisions over a wide range of mass and transverse momenta. The $e^{+}e^{-}$ yield is compared to the expectations from hadronic sources, based on PHENIX measurements. In the intermediate mass region, between the masses of the $\phi$ and the $J/\psi$ meson, the yield is consistent with expectations from correlated $c\bar c$ production, though other mechanisms are not ruled out. In the low mass region (below the $\phi$) the $p+p$ inclusive mass spectrum is well described by known contributions from light meson decays. In contrast, the Au+Au minimum bias inclusive mass spectrum in this region shows an enhancement by a factor of $4.7\pm 0.4^{stat}\pm 1.5^{syst}\pm 0.9^{model}$ At low mass ($m_{ee}$&lt;0.3 GeV/$c^{2}$) and high $p_{T}$ (1&lt;$p_{T}$&lt;5 GeV/$c$) an enhanced $e^{+}e^{-}$ pair yield is observed that is consistent with production of virtual direct photons. This excess is used to infer the yield of real direct photons. In central Au+Au collisions, the excess of the direct photon yield over the $p+p$ is exponential in $p_{T}$, with inverse slope $T = 221\pm 19^{stat}\pm 19^{syst}$ MeV. Hydrodynamical models with initial temperatures ranging from $T_{init} \cong$300--600 MeV at times of 0.6--0.15 fm/$c$ after the collision are in qualitative agreement with the direct photon data in Au+Au. For low $p_{T}$&lt;1 GeV/$c$ the low mass region shows a further significant enhancement that increases with centrality and has an inverse slope of $T\cong$100 MeV. Theoretical models under predict the low mass, low $p_{T}$ enhancement. Error values of 9.99E+9 represent upper limit errors.
DOI: 10.17182/hepdata.145190.v1/t112
title: "Figure 46c pt.1" of "Detailed measurement of the $e^+ e^-$ pair continuum in $p+p$ and Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV and implications for direct photon production"

description: Subtracted $p_{T}$ spectrum in 300-750 compared to calculations from Elena Bratkovskaya. $p_{T}$ spectra of $e^{+}e^{−}$ pairs for 0.3 &lt; $m_{ee}$ &lt; 0.75 GeV/$c^{2}$ in Min. Bias Au + Au collisions compared to the expectations from the calculations of respectively R. Rapp and van Hees [15, 18, 83], Dusling and Zahed [19, 84, 85], Cassing and Bratkovskaya [20, 27, 86, 87]. The spectra are fully acceptance corrected. The curves show separately partonic and hadronic yields. For the curves of Rapp and van Hees [15, 18, 83] the two scenarios: Hadron Many Body Theory (HMBT) and Dropping Mass (DM) are shown. The sum is calculated with HMBT. The calculations are compared to the data from which the contributions of the cocktail of hadronic decays and charmed meson decays have been subtracted.
description: PHENIX has measured the $e^{+}e^{-}$ pair continuum in $\sqrt{s_{NN}}$=200 GeV Au+Au and $p+p$ collisions over a wide range of mass and transverse momenta. The $e^{+}e^{-}$ yield is compared to the expectations from hadronic sources, based on PHENIX measurements. In the intermediate mass region, between the masses of the $\phi$ and the $J/\psi$ meson, the yield is consistent with expectations from correlated $c\bar c$ production, though other mechanisms are not ruled out. In the low mass region (below the $\phi$) the $p+p$ inclusive mass spectrum is well described by known contributions from light meson decays. In contrast, the Au+Au minimum bias inclusive mass spectrum in this region shows an enhancement by a factor of $4.7\pm 0.4^{stat}\pm 1.5^{syst}\pm 0.9^{model}$ At low mass ($m_{ee}$&lt;0.3 GeV/$c^{2}$) and high $p_{T}$ (1&lt;$p_{T}$&lt;5 GeV/$c$) an enhanced $e^{+}e^{-}$ pair yield is observed that is consistent with production of virtual direct photons. This excess is used to infer the yield of real direct photons. In central Au+Au collisions, the excess of the direct photon yield over the $p+p$ is exponential in $p_{T}$, with inverse slope $T = 221\pm 19^{stat}\pm 19^{syst}$ MeV. Hydrodynamical models with initial temperatures ranging from $T_{init} \cong$300--600 MeV at times of 0.6--0.15 fm/$c$ after the collision are in qualitative agreement with the direct photon data in Au+Au. For low $p_{T}$&lt;1 GeV/$c$ the low mass region shows a further significant enhancement that increases with centrality and has an inverse slope of $T\cong$100 MeV. Theoretical models under predict the low mass, low $p_{T}$ enhancement. Error values of 9.99E+9 represent upper limit errors.
DOI: 10.17182/hepdata.145190.v1/t113
title: "Figure 46c pt.2" of "Detailed measurement of the $e^+ e^-$ pair continuum in $p+p$ and Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV and implications for direct photon production"

description: Subtracted $p_{T}$ spectrum in 300-750 compared to calculations from Elena Bratkovskaya. $p_{T}$ spectra of $e^{+}e^{−}$ pairs for 0.3 &lt; $m_{ee}$ &lt; 0.75 GeV/$c^{2}$ in Min. Bias Au + Au collisions compared to the expectations from the calculations of respectively R. Rapp and van Hees [15, 18, 83], Dusling and Zahed [19, 84, 85], Cassing and Bratkovskaya [20, 27, 86, 87]. The spectra are fully acceptance corrected. The curves show separately partonic and hadronic yields. For the curves of Rapp and van Hees [15, 18, 83] the two scenarios: Hadron Many Body Theory (HMBT) and Dropping Mass (DM) are shown. The sum is calculated with HMBT. The calculations are compared to the data from which the contributions of the cocktail of hadronic decays and charmed meson decays have been subtracted.
description: PHENIX has measured the $e^{+}e^{-}$ pair continuum in $\sqrt{s_{NN}}$=200 GeV Au+Au and $p+p$ collisions over a wide range of mass and transverse momenta. The $e^{+}e^{-}$ yield is compared to the expectations from hadronic sources, based on PHENIX measurements. In the intermediate mass region, between the masses of the $\phi$ and the $J/\psi$ meson, the yield is consistent with expectations from correlated $c\bar c$ production, though other mechanisms are not ruled out. In the low mass region (below the $\phi$) the $p+p$ inclusive mass spectrum is well described by known contributions from light meson decays. In contrast, the Au+Au minimum bias inclusive mass spectrum in this region shows an enhancement by a factor of $4.7\pm 0.4^{stat}\pm 1.5^{syst}\pm 0.9^{model}$ At low mass ($m_{ee}$&lt;0.3 GeV/$c^{2}$) and high $p_{T}$ (1&lt;$p_{T}$&lt;5 GeV/$c$) an enhanced $e^{+}e^{-}$ pair yield is observed that is consistent with production of virtual direct photons. This excess is used to infer the yield of real direct photons. In central Au+Au collisions, the excess of the direct photon yield over the $p+p$ is exponential in $p_{T}$, with inverse slope $T = 221\pm 19^{stat}\pm 19^{syst}$ MeV. Hydrodynamical models with initial temperatures ranging from $T_{init} \cong$300--600 MeV at times of 0.6--0.15 fm/$c$ after the collision are in qualitative agreement with the direct photon data in Au+Au. For low $p_{T}$&lt;1 GeV/$c$ the low mass region shows a further significant enhancement that increases with centrality and has an inverse slope of $T\cong$100 MeV. Theoretical models under predict the low mass, low $p_{T}$ enhancement. Error values of 9.99E+9 represent upper limit errors.
DOI: 10.5281/zenodo.17527256
title: APPENDIX 1 in Discovery of two crania of Equus (Sussemionus) ovodovi Eisenmann & Vasiliev, 2011 (Mammalia, Perissodactyla) from the Late Pleistocene of Khakassia, Russia

description: APPENDIX 1. — Measures in mm of upper cheek teeth of Equus (Sussemionus) ovodovi Eisenmann & Vasiliev, 2011.
E. ovodovi, Fanatic CaveIAET-1IAET-2sindexsindexP2/-M3/ alveloar length160159.7157.5157P2/-M3/ occlusal length159.2159154.6155P2/occlusal length353634.333.5protocone length8.27.87.17.1occlusal breadth23.324.223.723.1crown height334546protocone index23.4321.6720.721.19P3/occlusal length2726.826.226.9protocone length10.410.58.79occlusal breadth25.125.824.524.5crown height3453protocone index38.5239.1833.2133.46P4/occlusal length26262625.3protocone length11.311.49.99.2occlusal breadth25.926.525.125.4crown heightprotocone index43.4643.8538.0836.36M1/occlusal length232422.822.5protocone length12.111.98.68.2occlusal breadth25.625.52524.8crown height4554protocone index52.6149.5837.7236.44M2/occlusal length23.723.32323.6protocone length1312.6109.8occlusal breadth25.525.424.624.7crown height4656protocone index54.8554.143.4841.53M3/occlusal length2726.726.626protocone length1212.310.810.4occlusal breadth2323.722.222.2crown height4960protocone index44.4446.0740.640
description: Published as part of Eisenmann, Véra & Vasiliev, Sergei K., 2025, Discovery of two crania of Equus (Sussemionus) ovodovi Eisenmann & Vasiliev, 2011 (Mammalia, Perissodactyla) from the Late Pleistocene of Khakassia, Russia, pp. 719 in Geodiversitas 47 (19) on page 719, DOI: 10.5252/geodiversitas2025v47a19, http://zenodo.org/record/17520509
DOI: 10.5281/zenodo.17527257
title: APPENDIX 1 in Discovery of two crania of Equus (Sussemionus) ovodovi Eisenmann & Vasiliev, 2011 (Mammalia, Perissodactyla) from the Late Pleistocene of Khakassia, Russia

description: APPENDIX 1. — Measures in mm of upper cheek teeth of Equus (Sussemionus) ovodovi Eisenmann & Vasiliev, 2011.
E. ovodovi, Fanatic CaveIAET-1IAET-2sindexsindexP2/-M3/ alveloar length160159.7157.5157P2/-M3/ occlusal length159.2159154.6155P2/occlusal length353634.333.5protocone length8.27.87.17.1occlusal breadth23.324.223.723.1crown height334546protocone index23.4321.6720.721.19P3/occlusal length2726.826.226.9protocone length10.410.58.79occlusal breadth25.125.824.524.5crown height3453protocone index38.5239.1833.2133.46P4/occlusal length26262625.3protocone length11.311.49.99.2occlusal breadth25.926.525.125.4crown heightprotocone index43.4643.8538.0836.36M1/occlusal length232422.822.5protocone length12.111.98.68.2occlusal breadth25.625.52524.8crown height4554protocone index52.6149.5837.7236.44M2/occlusal length23.723.32323.6protocone length1312.6109.8occlusal breadth25.525.424.624.7crown height4656protocone index54.8554.143.4841.53M3/occlusal length2726.726.626protocone length1212.310.810.4occlusal breadth2323.722.222.2crown height4960protocone index44.4446.0740.640
description: Published as part of Eisenmann, Véra & Vasiliev, Sergei K., 2025, Discovery of two crania of Equus (Sussemionus) ovodovi Eisenmann & Vasiliev, 2011 (Mammalia, Perissodactyla) from the Late Pleistocene of Khakassia, Russia, pp. 719 in Geodiversitas 47 (19) on page 719, DOI: 10.5252/geodiversitas2025v47a19, http://zenodo.org/record/17520509
DOI: 10.17182/hepdata.145191.v1/t1
title: "Di-jet invariant mass after preselections" of "Search for Resonant Production of Dark Quarks in the Dijet Final State with the ATLAS Detector"

description: Distribution of the di-jet invariant mass, $m_{\mathrm{JJ}}$ for the data, the simulated multi-jet background and of some representative signals (models A, B, C and D with $m_{Z'}=2.5$ TeV), shown after applying the preselections described in the text. The simulated background is normalised to the data and the signals are normalised to a production cross-section of 10 fb.
description: This paper presents a search for a new $Z^\prime$ resonance decaying into a pair of dark quarks which hadronise into dark hadrons before promptly decaying back to Standard Model particles. This analysis is based on proton-proton collision data recorded at $\sqrt{s}=13$ TeV with the ATLAS detector at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 fb$^{-1}$. After selecting events containing large-radius jets with high track multiplicity, the invariant mass distribution of the two leading jets is scanned to look for an excess above a data-driven estimate of the Standard Model multi-jet background. No significant excess of events is observed and the results are thus used to set $95 \%$ confidence-level upper limits on the production cross-section times branching ratio of the $Z^\prime$ to dark quarks as a function of the $Z^\prime$ mass for various dark-quark scenarios.
DOI: 10.17182/hepdata.145191.v1/t2
title: "Leading jet number of tracks after preselections" of "Search for Resonant Production of Dark Quarks in the Dijet Final State with the ATLAS Detector"

description: Distributions of the number of tracks associated to the leading jet, $n_{track,1}$, for the data, the simulated multi-jet background and of some representative signals (models A, B, C and D with $m_{Z^\prime}=2.5$ TeV), shown after applying the preselections described in the text. All distributions are normalised to unity. The uncertainty band around the background prediction corresponds to the modelling uncertainty described in Section 6.
description: This paper presents a search for a new $Z^\prime$ resonance decaying into a pair of dark quarks which hadronise into dark hadrons before promptly decaying back to Standard Model particles. This analysis is based on proton-proton collision data recorded at $\sqrt{s}=13$ TeV with the ATLAS detector at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 fb$^{-1}$. After selecting events containing large-radius jets with high track multiplicity, the invariant mass distribution of the two leading jets is scanned to look for an excess above a data-driven estimate of the Standard Model multi-jet background. No significant excess of events is observed and the results are thus used to set $95 \%$ confidence-level upper limits on the production cross-section times branching ratio of the $Z^\prime$ to dark quarks as a function of the $Z^\prime$ mass for various dark-quark scenarios.
DOI: 10.17182/hepdata.145191.v1/t3
title: "Sub-leading jet number of tracks after preselections" of "Search for Resonant Production of Dark Quarks in the Dijet Final State with the ATLAS Detector"

description: Distributions of the number of tracks associated to the subleading jet, $n_{track,2}$, for the data, the simulated multi-jet background and of some representative signals (models A, B, C and D with $m_{Z^\prime}=2.5$ TeV), shown after applying the preselections described in the text. All distributions are normalised to unity. The uncertainty band around the background prediction corresponds to the modelling uncertainty described in Section 6.
description: This paper presents a search for a new $Z^\prime$ resonance decaying into a pair of dark quarks which hadronise into dark hadrons before promptly decaying back to Standard Model particles. This analysis is based on proton-proton collision data recorded at $\sqrt{s}=13$ TeV with the ATLAS detector at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 fb$^{-1}$. After selecting events containing large-radius jets with high track multiplicity, the invariant mass distribution of the two leading jets is scanned to look for an excess above a data-driven estimate of the Standard Model multi-jet background. No significant excess of events is observed and the results are thus used to set $95 \%$ confidence-level upper limits on the production cross-section times branching ratio of the $Z^\prime$ to dark quarks as a function of the $Z^\prime$ mass for various dark-quark scenarios.
DOI: 10.17182/hepdata.145191.v1/t4
title: "Di-jet invariant mass in SR vs. background-only expectation" of "Search for Resonant Production of Dark Quarks in the Dijet Final State with the ATLAS Detector"

description: Distribution of $m_{\mathrm{JJ}}$ in the SR (black points) compared to the background-only expectation, where the shape is derived from the CR and the normalisation is fitted in the SR.
description: This paper presents a search for a new $Z^\prime$ resonance decaying into a pair of dark quarks which hadronise into dark hadrons before promptly decaying back to Standard Model particles. This analysis is based on proton-proton collision data recorded at $\sqrt{s}=13$ TeV with the ATLAS detector at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 fb$^{-1}$. After selecting events containing large-radius jets with high track multiplicity, the invariant mass distribution of the two leading jets is scanned to look for an excess above a data-driven estimate of the Standard Model multi-jet background. No significant excess of events is observed and the results are thus used to set $95 \%$ confidence-level upper limits on the production cross-section times branching ratio of the $Z^\prime$ to dark quarks as a function of the $Z^\prime$ mass for various dark-quark scenarios.