cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.142335.v1/t1
title: "1-dimensional limits on AQGC" of "Search for high-mass exclusive diphoton production with tagged protons in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

description: 95% expected and observed one-dimensional limits on $\zeta_1$ and $\zeta_2$ anomalous LbyL production parameters, when the other parameter is set to zero.
This corresponds to a search region of $m_{\gamma\gamma} &gt; 350$ GeV, $0.070 &lt; \xi^+ &lt; 0.111$, and $0.070 &lt; \xi^- &lt; 0.138$.
description: A search is presented for high-mass exclusive diphoton production via photon-photon fusion in proton-proton collisions at $\sqrt{s} = 13 TeV$ in events where both protons survive the interaction. The analysis utilizes data corresponding to an integrated luminosity of 103 $fb^{-1}$ collected in 2016--2018 with the central CMS detector and the CMS and TOTEM precision proton spectrometer (PPS). Events that have two photons with high transverse momenta ($p_T^{\gamma} &gt; 100 GeV$), back-to-back in azimuth, and with a large diphoton invariant mass ($m_{\gamma\gamma} &gt; 350 GeV$) are selected. To remove the dominant inclusive diphoton backgrounds, the kinematic properties of the protons detected in PPS are required to match those of the central diphoton system. Only events having opposite-side forward protons detected with a fractional momentum loss between 0.035 and 0.15 (0.18) for the detectors on the negative (positive) side of CMS are considered. One exclusive diphoton candidate is observed for an expected background of 1.1 events. Limits at 95\% confidence level are derived for the four-photon anomalous coupling parameters $\abs{\zeta_1} &lt; 0.073 TeV^{-4}$ and $\abs{\zeta_2} &lt; 0.15 TeV^{-4}$, using an effective field theory. Additionally, upper limits are placed on the production of axion-like particles with coupling strength to photons $f^{-1}$ that varies from $0.03 TeV^{-1}$ to $1 TeV^{-1}$ over the mass range from 500 to 2000 GeV.
DOI: 10.17182/hepdata.142335.v1/t2
title: "Figure 9" of "Search for high-mass exclusive diphoton production with tagged protons in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

description: Two-dimensional limits on anomalous quartic gauge coupling parameters.
The parametric elliptic form is assumed: $\sigma=a_0\zeta_1^2+a_1\zeta_1\zeta_2+a_2\zeta_2^2$.
description: A search is presented for high-mass exclusive diphoton production via photon-photon fusion in proton-proton collisions at $\sqrt{s} = 13 TeV$ in events where both protons survive the interaction. The analysis utilizes data corresponding to an integrated luminosity of 103 $fb^{-1}$ collected in 2016--2018 with the central CMS detector and the CMS and TOTEM precision proton spectrometer (PPS). Events that have two photons with high transverse momenta ($p_T^{\gamma} &gt; 100 GeV$), back-to-back in azimuth, and with a large diphoton invariant mass ($m_{\gamma\gamma} &gt; 350 GeV$) are selected. To remove the dominant inclusive diphoton backgrounds, the kinematic properties of the protons detected in PPS are required to match those of the central diphoton system. Only events having opposite-side forward protons detected with a fractional momentum loss between 0.035 and 0.15 (0.18) for the detectors on the negative (positive) side of CMS are considered. One exclusive diphoton candidate is observed for an expected background of 1.1 events. Limits at 95\% confidence level are derived for the four-photon anomalous coupling parameters $\abs{\zeta_1} &lt; 0.073 TeV^{-4}$ and $\abs{\zeta_2} &lt; 0.15 TeV^{-4}$, using an effective field theory. Additionally, upper limits are placed on the production of axion-like particles with coupling strength to photons $f^{-1}$ that varies from $0.03 TeV^{-1}$ to $1 TeV^{-1}$ over the mass range from 500 to 2000 GeV.
DOI: 10.17182/hepdata.142335.v1/t3
title: "Figure 11" of "Search for high-mass exclusive diphoton production with tagged protons in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

description: Limits on axion-like particle production.
description: A search is presented for high-mass exclusive diphoton production via photon-photon fusion in proton-proton collisions at $\sqrt{s} = 13 TeV$ in events where both protons survive the interaction. The analysis utilizes data corresponding to an integrated luminosity of 103 $fb^{-1}$ collected in 2016--2018 with the central CMS detector and the CMS and TOTEM precision proton spectrometer (PPS). Events that have two photons with high transverse momenta ($p_T^{\gamma} &gt; 100 GeV$), back-to-back in azimuth, and with a large diphoton invariant mass ($m_{\gamma\gamma} &gt; 350 GeV$) are selected. To remove the dominant inclusive diphoton backgrounds, the kinematic properties of the protons detected in PPS are required to match those of the central diphoton system. Only events having opposite-side forward protons detected with a fractional momentum loss between 0.035 and 0.15 (0.18) for the detectors on the negative (positive) side of CMS are considered. One exclusive diphoton candidate is observed for an expected background of 1.1 events. Limits at 95\% confidence level are derived for the four-photon anomalous coupling parameters $\abs{\zeta_1} &lt; 0.073 TeV^{-4}$ and $\abs{\zeta_2} &lt; 0.15 TeV^{-4}$, using an effective field theory. Additionally, upper limits are placed on the production of axion-like particles with coupling strength to photons $f^{-1}$ that varies from $0.03 TeV^{-1}$ to $1 TeV^{-1}$ over the mass range from 500 to 2000 GeV.
DOI: 10.17182/hepdata.142336.v1/t1
title: "Figure 2a" of "Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$ from 62.4 GeV to 2.76 TeV"

description: Global variables for Au+Au collisions at RHIC from PHENIX.
description: 'Measurements of the fractional momentum loss ($S_{loss}$ ≡ $\delta p_T/p_T$) of high-transverse-momentum identified hadrons in heavy ion collisions are presented. Using $\pi^0$ in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of $S_{loss}$ as a function of a number of variables: the number of participants, $N_{part}$, the number of quark participants, $N_{qp}$, the charged particle density, $dN_{ch}/d \eta$, and the Bjorken energy density times the equilibration time, $\epsilon B_j \tau_0$. We find that the $p_T$ , where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at $\sqrt{s_{NN}}$ = 200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of $S_{loss}$ with $dN_{ch}/d \eta$ and $\epsilon B_j \tau_0$, lending insight on the physics of parton energy loss.'
DOI: 10.17182/hepdata.142336.v1/t2
title: "Figure 2b" of "Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$ from 62.4 GeV to 2.76 TeV"

description: Global variables for Au+Au collisions at RHIC from PHENIX.
description: 'Measurements of the fractional momentum loss ($S_{loss}$ ≡ $\delta p_T/p_T$) of high-transverse-momentum identified hadrons in heavy ion collisions are presented. Using $\pi^0$ in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of $S_{loss}$ as a function of a number of variables: the number of participants, $N_{part}$, the number of quark participants, $N_{qp}$, the charged particle density, $dN_{ch}/d \eta$, and the Bjorken energy density times the equilibration time, $\epsilon B_j \tau_0$. We find that the $p_T$ , where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at $\sqrt{s_{NN}}$ = 200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of $S_{loss}$ with $dN_{ch}/d \eta$ and $\epsilon B_j \tau_0$, lending insight on the physics of parton energy loss.'
DOI: 10.17182/hepdata.142336.v1/t3
title: "Table 3a" of "Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$ from 62.4 GeV to 2.76 TeV"

description: Global variables for Cu+Cu collisions at RHIC from PHENIX.
description: 'Measurements of the fractional momentum loss ($S_{loss}$ ≡ $\delta p_T/p_T$) of high-transverse-momentum identified hadrons in heavy ion collisions are presented. Using $\pi^0$ in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of $S_{loss}$ as a function of a number of variables: the number of participants, $N_{part}$, the number of quark participants, $N_{qp}$, the charged particle density, $dN_{ch}/d \eta$, and the Bjorken energy density times the equilibration time, $\epsilon B_j \tau_0$. We find that the $p_T$ , where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at $\sqrt{s_{NN}}$ = 200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of $S_{loss}$ with $dN_{ch}/d \eta$ and $\epsilon B_j \tau_0$, lending insight on the physics of parton energy loss.'
DOI: 10.17182/hepdata.142336.v1/t4
title: "Table 3b" of "Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$ from 62.4 GeV to 2.76 TeV"

description: Global variables for Pb+Pb collisions at the LHC from ALICE.
description: 'Measurements of the fractional momentum loss ($S_{loss}$ ≡ $\delta p_T/p_T$) of high-transverse-momentum identified hadrons in heavy ion collisions are presented. Using $\pi^0$ in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of $S_{loss}$ as a function of a number of variables: the number of participants, $N_{part}$, the number of quark participants, $N_{qp}$, the charged particle density, $dN_{ch}/d \eta$, and the Bjorken energy density times the equilibration time, $\epsilon B_j \tau_0$. We find that the $p_T$ , where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at $\sqrt{s_{NN}}$ = 200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of $S_{loss}$ with $dN_{ch}/d \eta$ and $\epsilon B_j \tau_0$, lending insight on the physics of parton energy loss.'
DOI: 10.17182/hepdata.142336.v1/t5
title: "Figure 3a" of "Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$ from 62.4 GeV to 2.76 TeV"

description: $p^{pp}_T$ dependence of $S_{loss}$ for $\pi^0$ in 200 GeV Au+Au collisions from 2007 data from the PHENIX experiment at RHIC.
description: 'Measurements of the fractional momentum loss ($S_{loss}$ ≡ $\delta p_T/p_T$) of high-transverse-momentum identified hadrons in heavy ion collisions are presented. Using $\pi^0$ in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of $S_{loss}$ as a function of a number of variables: the number of participants, $N_{part}$, the number of quark participants, $N_{qp}$, the charged particle density, $dN_{ch}/d \eta$, and the Bjorken energy density times the equilibration time, $\epsilon B_j \tau_0$. We find that the $p_T$ , where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at $\sqrt{s_{NN}}$ = 200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of $S_{loss}$ with $dN_{ch}/d \eta$ and $\epsilon B_j \tau_0$, lending insight on the physics of parton energy loss.'
DOI: 10.17182/hepdata.142336.v1/t6
title: "Figure 3b" of "Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$ from 62.4 GeV to 2.76 TeV"

description: $p^{pp}_T$ dependence of $S_{loss}$ for $\pi^0$ in 200 GeV Au+Au collisions from 2004 data from the PHENIX experiment at RHIC for $p_T$ &lt;10 GeV/$c$.
description: 'Measurements of the fractional momentum loss ($S_{loss}$ ≡ $\delta p_T/p_T$) of high-transverse-momentum identified hadrons in heavy ion collisions are presented. Using $\pi^0$ in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of $S_{loss}$ as a function of a number of variables: the number of participants, $N_{part}$, the number of quark participants, $N_{qp}$, the charged particle density, $dN_{ch}/d \eta$, and the Bjorken energy density times the equilibration time, $\epsilon B_j \tau_0$. We find that the $p_T$ , where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at $\sqrt{s_{NN}}$ = 200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of $S_{loss}$ with $dN_{ch}/d \eta$ and $\epsilon B_j \tau_0$, lending insight on the physics of parton energy loss.'
DOI: 10.17182/hepdata.142336.v1/t10
title: "Figure 7" of "Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$ from 62.4 GeV to 2.76 TeV"

description: $p^{pp}_T$ dependence of $S_{loss}$ for $\pi^0$ in 2.76 TeV Pb+Pb collisions using the result from the ALICE experiment.
description: 'Measurements of the fractional momentum loss ($S_{loss}$ ≡ $\delta p_T/p_T$) of high-transverse-momentum identified hadrons in heavy ion collisions are presented. Using $\pi^0$ in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of $S_{loss}$ as a function of a number of variables: the number of participants, $N_{part}$, the number of quark participants, $N_{qp}$, the charged particle density, $dN_{ch}/d \eta$, and the Bjorken energy density times the equilibration time, $\epsilon B_j \tau_0$. We find that the $p_T$ , where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at $\sqrt{s_{NN}}$ = 200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of $S_{loss}$ with $dN_{ch}/d \eta$ and $\epsilon B_j \tau_0$, lending insight on the physics of parton energy loss.'
DOI: 10.17182/hepdata.142336.v1/t11
title: "Figure 16a" of "Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$ from 62.4 GeV to 2.76 TeV"

description: Parameters from fitting the indicated power-law functions for $\delta p_T/p_T$ to the data as a function of $p^{pp}_T$ for Au+Au collisions from 2004 data at $\sqrt{s_{NN}}$ = 200 GeV.
description: 'Measurements of the fractional momentum loss ($S_{loss}$ ≡ $\delta p_T/p_T$) of high-transverse-momentum identified hadrons in heavy ion collisions are presented. Using $\pi^0$ in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of $S_{loss}$ as a function of a number of variables: the number of participants, $N_{part}$, the number of quark participants, $N_{qp}$, the charged particle density, $dN_{ch}/d \eta$, and the Bjorken energy density times the equilibration time, $\epsilon B_j \tau_0$. We find that the $p_T$ , where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at $\sqrt{s_{NN}}$ = 200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of $S_{loss}$ with $dN_{ch}/d \eta$ and $\epsilon B_j \tau_0$, lending insight on the physics of parton energy loss.'
DOI: 10.17182/hepdata.142336.v1/t12
title: "Figure 16b" of "Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$ from 62.4 GeV to 2.76 TeV"

description: Parameters from fitting the indicated power-law functions for $\delta p_T/p_T$ to the data as a function of $p^{pp}_T$ for Au+Au collisions from 2007 data at $\sqrt{s_{NN}}$ = 200 GeV.
description: 'Measurements of the fractional momentum loss ($S_{loss}$ ≡ $\delta p_T/p_T$) of high-transverse-momentum identified hadrons in heavy ion collisions are presented. Using $\pi^0$ in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of $S_{loss}$ as a function of a number of variables: the number of participants, $N_{part}$, the number of quark participants, $N_{qp}$, the charged particle density, $dN_{ch}/d \eta$, and the Bjorken energy density times the equilibration time, $\epsilon B_j \tau_0$. We find that the $p_T$ , where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at $\sqrt{s_{NN}}$ = 200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of $S_{loss}$ with $dN_{ch}/d \eta$ and $\epsilon B_j \tau_0$, lending insight on the physics of parton energy loss.'
DOI: 10.17182/hepdata.142336.v1/t13
title: "Figure 16c" of "Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$ from 62.4 GeV to 2.76 TeV"

description: Parameters from fitting the indicated power-law functions for $\delta p_T/p_T$ to the data as a function of $p^{pp}_T$ for Cu+Cu collisions from 2005 data at $\sqrt{s_{NN}}$ = 200 GeV.
description: 'Measurements of the fractional momentum loss ($S_{loss}$ ≡ $\delta p_T/p_T$) of high-transverse-momentum identified hadrons in heavy ion collisions are presented. Using $\pi^0$ in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of $S_{loss}$ as a function of a number of variables: the number of participants, $N_{part}$, the number of quark participants, $N_{qp}$, the charged particle density, $dN_{ch}/d \eta$, and the Bjorken energy density times the equilibration time, $\epsilon B_j \tau_0$. We find that the $p_T$ , where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at $\sqrt{s_{NN}}$ = 200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of $S_{loss}$ with $dN_{ch}/d \eta$ and $\epsilon B_j \tau_0$, lending insight on the physics of parton energy loss.'
DOI: 10.17182/hepdata.142336.v1/t7
title: "Figure 4" of "Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$ from 62.4 GeV to 2.76 TeV"

description: $p^{pp}_T$ dependence of $S_{loss}$ for $\pi^0$ in 200 GeV Cu+Cu collisions using the spectra measured by PHENIX at RHIC in 2005.
description: 'Measurements of the fractional momentum loss ($S_{loss}$ ≡ $\delta p_T/p_T$) of high-transverse-momentum identified hadrons in heavy ion collisions are presented. Using $\pi^0$ in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of $S_{loss}$ as a function of a number of variables: the number of participants, $N_{part}$, the number of quark participants, $N_{qp}$, the charged particle density, $dN_{ch}/d \eta$, and the Bjorken energy density times the equilibration time, $\epsilon B_j \tau_0$. We find that the $p_T$ , where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at $\sqrt{s_{NN}}$ = 200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of $S_{loss}$ with $dN_{ch}/d \eta$ and $\epsilon B_j \tau_0$, lending insight on the physics of parton energy loss.'
DOI: 10.17182/hepdata.142336.v1/t8
title: "Figure 5" of "Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$ from 62.4 GeV to 2.76 TeV"

description: $p^{pp}_T$ dependence of $S_{loss}$ for $\pi^0$ in 62 GeV Au+Au collisions using the spectra measured by PHENIX in 2010.
description: 'Measurements of the fractional momentum loss ($S_{loss}$ ≡ $\delta p_T/p_T$) of high-transverse-momentum identified hadrons in heavy ion collisions are presented. Using $\pi^0$ in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of $S_{loss}$ as a function of a number of variables: the number of participants, $N_{part}$, the number of quark participants, $N_{qp}$, the charged particle density, $dN_{ch}/d \eta$, and the Bjorken energy density times the equilibration time, $\epsilon B_j \tau_0$. We find that the $p_T$ , where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at $\sqrt{s_{NN}}$ = 200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of $S_{loss}$ with $dN_{ch}/d \eta$ and $\epsilon B_j \tau_0$, lending insight on the physics of parton energy loss.'