cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.143252.v1/t8
title: "Figure 9b" of "Nonperturbative-transverse-momentum effects and evolution in dihadron and direct photon-hadron angular correlations in $p$$+$$p$ collisions at $\sqrt{s}$=510 GeV"

description: Direct photon per trigger yields as a function of $p_{out}$.
description: Dihadron and isolated direct photon-hadron angular correlations are measured in $p$+$p$ collisions at $\sqrt{s}$ = 510 GeV. Correlations of charged hadrons of 0.7 &lt; $p_T$ &lt; 10 GeV/$c$ with $\pi^0$ mesons of 4 &lt; $p_T$ &lt; 15 GeV/$c$ or isolated direct photons of 7 &lt; $p_T$ &lt; 15 GeV/$c$ are used to study nonperturbative effects generated by initial-state partonic transverse momentum and final-state transverse momentum from fragmentation. The nonperturbative behavior is characterized by measuring the out-of-plane transverse momentum component $p_{out}$ perpendicular to the axis of the trigger particle, which is the high-$p_T$ direct photon or $\pi^0$. Nonperturbative evolution effects are extracted from Gaussian fits to the away-side inclusive-charged-hadron yields for different trigger-particle transverse momenta ($p^{trig}_T$). The Gaussian widths and root mean square of $p_{out}$ are reported as a function of the interaction hard scale $p^{trig}_T$ to investigate possible transverse-momentum-dependent evolution differences between the $\pi^0$-h$^\pm$ and direct photon-h$^\pm$ correlations and factorization breaking effects. The widths are found to decrease with $p^{trig}_T$, which indicates that the Collins-Soper-Sterman soft factor is not driving the evolution with the hard scale in nearly back-to-back dihadron and direct photonhadron production in $p$+$p$ collisions. This behavior is in contrast to Drell-Yan and semi-inclusive deep-inelastic scattering measurements.
DOI: 10.17182/hepdata.143252.v1/t10
title: "Supplemental b" of "Nonperturbative-transverse-momentum effects and evolution in dihadron and direct photon-hadron angular correlations in $p$$+$$p$ collisions at $\sqrt{s}$=510 GeV"

description: Direct photon per-trigger yields as a function of $\Delta \phi$.
description: Dihadron and isolated direct photon-hadron angular correlations are measured in $p$+$p$ collisions at $\sqrt{s}$ = 510 GeV. Correlations of charged hadrons of 0.7 &lt; $p_T$ &lt; 10 GeV/$c$ with $\pi^0$ mesons of 4 &lt; $p_T$ &lt; 15 GeV/$c$ or isolated direct photons of 7 &lt; $p_T$ &lt; 15 GeV/$c$ are used to study nonperturbative effects generated by initial-state partonic transverse momentum and final-state transverse momentum from fragmentation. The nonperturbative behavior is characterized by measuring the out-of-plane transverse momentum component $p_{out}$ perpendicular to the axis of the trigger particle, which is the high-$p_T$ direct photon or $\pi^0$. Nonperturbative evolution effects are extracted from Gaussian fits to the away-side inclusive-charged-hadron yields for different trigger-particle transverse momenta ($p^{trig}_T$). The Gaussian widths and root mean square of $p_{out}$ are reported as a function of the interaction hard scale $p^{trig}_T$ to investigate possible transverse-momentum-dependent evolution differences between the $\pi^0$-h$^\pm$ and direct photon-h$^\pm$ correlations and factorization breaking effects. The widths are found to decrease with $p^{trig}_T$, which indicates that the Collins-Soper-Sterman soft factor is not driving the evolution with the hard scale in nearly back-to-back dihadron and direct photonhadron production in $p$+$p$ collisions. This behavior is in contrast to Drell-Yan and semi-inclusive deep-inelastic scattering measurements.
DOI: 10.17182/hepdata.143252.v1/t11
title: "Table Ia" of "Nonperturbative-transverse-momentum effects and evolution in dihadron and direct photon-hadron angular correlations in $p$$+$$p$ collisions at $\sqrt{s}$=510 GeV"

description: Gaussian widths from fits to the $p_{out}$ distributions.
description: Dihadron and isolated direct photon-hadron angular correlations are measured in $p$+$p$ collisions at $\sqrt{s}$ = 510 GeV. Correlations of charged hadrons of 0.7 &lt; $p_T$ &lt; 10 GeV/$c$ with $\pi^0$ mesons of 4 &lt; $p_T$ &lt; 15 GeV/$c$ or isolated direct photons of 7 &lt; $p_T$ &lt; 15 GeV/$c$ are used to study nonperturbative effects generated by initial-state partonic transverse momentum and final-state transverse momentum from fragmentation. The nonperturbative behavior is characterized by measuring the out-of-plane transverse momentum component $p_{out}$ perpendicular to the axis of the trigger particle, which is the high-$p_T$ direct photon or $\pi^0$. Nonperturbative evolution effects are extracted from Gaussian fits to the away-side inclusive-charged-hadron yields for different trigger-particle transverse momenta ($p^{trig}_T$). The Gaussian widths and root mean square of $p_{out}$ are reported as a function of the interaction hard scale $p^{trig}_T$ to investigate possible transverse-momentum-dependent evolution differences between the $\pi^0$-h$^\pm$ and direct photon-h$^\pm$ correlations and factorization breaking effects. The widths are found to decrease with $p^{trig}_T$, which indicates that the Collins-Soper-Sterman soft factor is not driving the evolution with the hard scale in nearly back-to-back dihadron and direct photonhadron production in $p$+$p$ collisions. This behavior is in contrast to Drell-Yan and semi-inclusive deep-inelastic scattering measurements.
DOI: 10.17182/hepdata.143252.v1/t9
title: "Supplemental a" of "Nonperturbative-transverse-momentum effects and evolution in dihadron and direct photon-hadron angular correlations in $p$$+$$p$ collisions at $\sqrt{s}$=510 GeV"

description: $\pi^0$ per-trigger yields as a function of $\Delta \phi$.
description: Dihadron and isolated direct photon-hadron angular correlations are measured in $p$+$p$ collisions at $\sqrt{s}$ = 510 GeV. Correlations of charged hadrons of 0.7 &lt; $p_T$ &lt; 10 GeV/$c$ with $\pi^0$ mesons of 4 &lt; $p_T$ &lt; 15 GeV/$c$ or isolated direct photons of 7 &lt; $p_T$ &lt; 15 GeV/$c$ are used to study nonperturbative effects generated by initial-state partonic transverse momentum and final-state transverse momentum from fragmentation. The nonperturbative behavior is characterized by measuring the out-of-plane transverse momentum component $p_{out}$ perpendicular to the axis of the trigger particle, which is the high-$p_T$ direct photon or $\pi^0$. Nonperturbative evolution effects are extracted from Gaussian fits to the away-side inclusive-charged-hadron yields for different trigger-particle transverse momenta ($p^{trig}_T$). The Gaussian widths and root mean square of $p_{out}$ are reported as a function of the interaction hard scale $p^{trig}_T$ to investigate possible transverse-momentum-dependent evolution differences between the $\pi^0$-h$^\pm$ and direct photon-h$^\pm$ correlations and factorization breaking effects. The widths are found to decrease with $p^{trig}_T$, which indicates that the Collins-Soper-Sterman soft factor is not driving the evolution with the hard scale in nearly back-to-back dihadron and direct photonhadron production in $p$+$p$ collisions. This behavior is in contrast to Drell-Yan and semi-inclusive deep-inelastic scattering measurements.
DOI: 10.17182/hepdata.143252.v1/t12
title: "Table Ib" of "Nonperturbative-transverse-momentum effects and evolution in dihadron and direct photon-hadron angular correlations in $p$$+$$p$ collisions at $\sqrt{s}$=510 GeV"

description: Gaussian widths from fits to the $p_{out}$ distributions.
description: Dihadron and isolated direct photon-hadron angular correlations are measured in $p$+$p$ collisions at $\sqrt{s}$ = 510 GeV. Correlations of charged hadrons of 0.7 &lt; $p_T$ &lt; 10 GeV/$c$ with $\pi^0$ mesons of 4 &lt; $p_T$ &lt; 15 GeV/$c$ or isolated direct photons of 7 &lt; $p_T$ &lt; 15 GeV/$c$ are used to study nonperturbative effects generated by initial-state partonic transverse momentum and final-state transverse momentum from fragmentation. The nonperturbative behavior is characterized by measuring the out-of-plane transverse momentum component $p_{out}$ perpendicular to the axis of the trigger particle, which is the high-$p_T$ direct photon or $\pi^0$. Nonperturbative evolution effects are extracted from Gaussian fits to the away-side inclusive-charged-hadron yields for different trigger-particle transverse momenta ($p^{trig}_T$). The Gaussian widths and root mean square of $p_{out}$ are reported as a function of the interaction hard scale $p^{trig}_T$ to investigate possible transverse-momentum-dependent evolution differences between the $\pi^0$-h$^\pm$ and direct photon-h$^\pm$ correlations and factorization breaking effects. The widths are found to decrease with $p^{trig}_T$, which indicates that the Collins-Soper-Sterman soft factor is not driving the evolution with the hard scale in nearly back-to-back dihadron and direct photonhadron production in $p$+$p$ collisions. This behavior is in contrast to Drell-Yan and semi-inclusive deep-inelastic scattering measurements.
DOI: 10.17182/hepdata.143253.v1/t1
title: "Figure 3a" of "Closing the Door for Dark Photons as the Explanation for the Muon g-2 Anomaly"

description: The experimental sensitivity and observed limit on the number of dark photon candidates as a function of the assumed dark photon mass.
description: The standard model (SM) of particle physics is spectacularly successful, yet the measured value of the muon anomalous magnetic moment ${(g-2)}_{\mu}$ deviates from SM calculations by 3.6$\sigma$. Several theoretical models attribute this to the existence of a "dark photon," an additional U(1) gauge boson, which is weakly coupled to ordinary photons. The PHENIX experiment at the Relativistic Heavy Ion Collider has searched for a dark photon, $U$, in $\pi^0$,$\eta \rightarrow \gamma e^+e^-$ decays and obtained upper limits of $O$(2*10-6) on $U$-$\gamma$ mixing at 90% C.L. for the mass range 30 &lt; $m_U$ &lt; 90 MeV/$c^2$. Combined with other experimental limits, the remaining region in the $U$-$\gamma$ mixing parameter space that can explain the ${(g-2)}_{\mu}$ deviation from its SM value is nearly completely excluded at the 90% confidence level, with only a small region of 29 &lt; $m_U$ MeV/$c^2$ remaining.
DOI: 10.17182/hepdata.143253.v1/t2
title: "Figure 3b" of "Closing the Door for Dark Photons as the Explanation for the Muon g-2 Anomaly"

description: The experimental sensitivity and observed limit on the number of dark photon candidates as a function of the assumed dark photon mass.
description: The standard model (SM) of particle physics is spectacularly successful, yet the measured value of the muon anomalous magnetic moment ${(g-2)}_{\mu}$ deviates from SM calculations by 3.6$\sigma$. Several theoretical models attribute this to the existence of a "dark photon," an additional U(1) gauge boson, which is weakly coupled to ordinary photons. The PHENIX experiment at the Relativistic Heavy Ion Collider has searched for a dark photon, $U$, in $\pi^0$,$\eta \rightarrow \gamma e^+e^-$ decays and obtained upper limits of $O$(2*10-6) on $U$-$\gamma$ mixing at 90% C.L. for the mass range 30 &lt; $m_U$ &lt; 90 MeV/$c^2$. Combined with other experimental limits, the remaining region in the $U$-$\gamma$ mixing parameter space that can explain the ${(g-2)}_{\mu}$ deviation from its SM value is nearly completely excluded at the 90% confidence level, with only a small region of 29 &lt; $m_U$ MeV/$c^2$ remaining.
DOI: 10.17182/hepdata.143253.v1/t3
title: "Figure 3c" of "Closing the Door for Dark Photons as the Explanation for the Muon g-2 Anomaly"

description: The experimental sensitivity and observed limit on the number of dark photon candidates as a function of the assumed dark photon mass.
description: The standard model (SM) of particle physics is spectacularly successful, yet the measured value of the muon anomalous magnetic moment ${(g-2)}_{\mu}$ deviates from SM calculations by 3.6$\sigma$. Several theoretical models attribute this to the existence of a "dark photon," an additional U(1) gauge boson, which is weakly coupled to ordinary photons. The PHENIX experiment at the Relativistic Heavy Ion Collider has searched for a dark photon, $U$, in $\pi^0$,$\eta \rightarrow \gamma e^+e^-$ decays and obtained upper limits of $O$(2*10-6) on $U$-$\gamma$ mixing at 90% C.L. for the mass range 30 &lt; $m_U$ &lt; 90 MeV/$c^2$. Combined with other experimental limits, the remaining region in the $U$-$\gamma$ mixing parameter space that can explain the ${(g-2)}_{\mu}$ deviation from its SM value is nearly completely excluded at the 90% confidence level, with only a small region of 29 &lt; $m_U$ MeV/$c^2$ remaining.
DOI: 10.17182/hepdata.143253.v1/t4
title: "Figure 3d" of "Closing the Door for Dark Photons as the Explanation for the Muon g-2 Anomaly"

description: The experimental sensitivity and observed limit on the number of dark photon candidates as a function of the assumed dark photon mass.
description: The standard model (SM) of particle physics is spectacularly successful, yet the measured value of the muon anomalous magnetic moment ${(g-2)}_{\mu}$ deviates from SM calculations by 3.6$\sigma$. Several theoretical models attribute this to the existence of a "dark photon," an additional U(1) gauge boson, which is weakly coupled to ordinary photons. The PHENIX experiment at the Relativistic Heavy Ion Collider has searched for a dark photon, $U$, in $\pi^0$,$\eta \rightarrow \gamma e^+e^-$ decays and obtained upper limits of $O$(2*10-6) on $U$-$\gamma$ mixing at 90% C.L. for the mass range 30 &lt; $m_U$ &lt; 90 MeV/$c^2$. Combined with other experimental limits, the remaining region in the $U$-$\gamma$ mixing parameter space that can explain the ${(g-2)}_{\mu}$ deviation from its SM value is nearly completely excluded at the 90% confidence level, with only a small region of 29 &lt; $m_U$ MeV/$c^2$ remaining.
DOI: 10.17182/hepdata.143253.v1/t5
title: "Figure 5" of "Closing the Door for Dark Photons as the Explanation for the Muon g-2 Anomaly"

description: Limits on the $U-\gamma$ mixing parameters from PHENIX at 90%, 85% and 80% confidence levels.
description: The standard model (SM) of particle physics is spectacularly successful, yet the measured value of the muon anomalous magnetic moment ${(g-2)}_{\mu}$ deviates from SM calculations by 3.6$\sigma$. Several theoretical models attribute this to the existence of a "dark photon," an additional U(1) gauge boson, which is weakly coupled to ordinary photons. The PHENIX experiment at the Relativistic Heavy Ion Collider has searched for a dark photon, $U$, in $\pi^0$,$\eta \rightarrow \gamma e^+e^-$ decays and obtained upper limits of $O$(2*10-6) on $U$-$\gamma$ mixing at 90% C.L. for the mass range 30 &lt; $m_U$ &lt; 90 MeV/$c^2$. Combined with other experimental limits, the remaining region in the $U$-$\gamma$ mixing parameter space that can explain the ${(g-2)}_{\mu}$ deviation from its SM value is nearly completely excluded at the 90% confidence level, with only a small region of 29 &lt; $m_U$ MeV/$c^2$ remaining.
DOI: 10.17182/hepdata.143254.v1/t1
title: "Fig. 1 Part 1" of "Suppressed pi0 production at large transverse momentum in central Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: Invariant $\pi^0$ yields at midrapidity as a function of $p_T$ for minimum bias and nine centralities in $Au\ +\ Au$ at $\sqrt{s_{NN}} = 200\ GeV$ [0%–10% (80%–92%) is most central (peripheral)]. The labels "uncorr." and "corr." include systematic errors that are uncorrelated and correlated point-to-point, respectively.
description: Transverse momentum spectra of neutral pions in the range $1 &lt; p_T &lt; 10Gev/c$ have been measured at midrapidity by the PHENIX experiment at BNL RHIC in Au $+$ Au collisions at $\sqrt{s_{NN}} = 200\ GeV$. The $\pi^0$ multiplicity in central reactions is significantly below the yields measured at the same $\sqrt{s_{NN}}$ in peripheral Au $+$ Au and $p+p$ reactions scaled by the number of nucleon-nucleon collisions. For the most central bin, the supression factor is ~2.5 at $p_T = 2GeV/c$ and increases to ~4-5 at $p_T \approx 4\ GeV/c$. At larger $p_T$, the suppression remains constant within errors. The deficit is already apparent in semiperipheral reactions and increases smoothly with centrality.
DOI: 10.17182/hepdata.143254.v1/t2
title: "Fig. 1 Part 2" of "Suppressed pi0 production at large transverse momentum in central Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: Invariant $\pi^0$ yields at midrapidity as a function of $p_T$ for minimum bias and nine centralities in $Au\ +\ Au$ at $\sqrt{s_{NN}} = 200\ GeV$ [0%–10% (80%–92%) is most central (peripheral)]. The labels "uncorr." and "corr." include systematic errors that are uncorrelated and correlated point-to-point, respectively.
description: Transverse momentum spectra of neutral pions in the range $1 &lt; p_T &lt; 10Gev/c$ have been measured at midrapidity by the PHENIX experiment at BNL RHIC in Au $+$ Au collisions at $\sqrt{s_{NN}} = 200\ GeV$. The $\pi^0$ multiplicity in central reactions is significantly below the yields measured at the same $\sqrt{s_{NN}}$ in peripheral Au $+$ Au and $p+p$ reactions scaled by the number of nucleon-nucleon collisions. For the most central bin, the supression factor is ~2.5 at $p_T = 2GeV/c$ and increases to ~4-5 at $p_T \approx 4\ GeV/c$. At larger $p_T$, the suppression remains constant within errors. The deficit is already apparent in semiperipheral reactions and increases smoothly with centrality.
DOI: 10.17182/hepdata.143254.v1/t3
title: "Fig. 1 Part 3" of "Suppressed pi0 production at large transverse momentum in central Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: Invariant $\pi^0$ yields at midrapidity as a function of $p_T$ for minimum bias and nine centralities in $Au\ +\ Au$ at $\sqrt{s_{NN}} = 200\ GeV$ [0%–10% (80%–92%) is most central (peripheral)]. The labels "uncorr." and "corr." include systematic errors that are uncorrelated and correlated point-to-point, respectively.
description: Transverse momentum spectra of neutral pions in the range $1 &lt; p_T &lt; 10Gev/c$ have been measured at midrapidity by the PHENIX experiment at BNL RHIC in Au $+$ Au collisions at $\sqrt{s_{NN}} = 200\ GeV$. The $\pi^0$ multiplicity in central reactions is significantly below the yields measured at the same $\sqrt{s_{NN}}$ in peripheral Au $+$ Au and $p+p$ reactions scaled by the number of nucleon-nucleon collisions. For the most central bin, the supression factor is ~2.5 at $p_T = 2GeV/c$ and increases to ~4-5 at $p_T \approx 4\ GeV/c$. At larger $p_T$, the suppression remains constant within errors. The deficit is already apparent in semiperipheral reactions and increases smoothly with centrality.
DOI: 10.17182/hepdata.143254.v1/t4
title: "Fig. 1 Part 4" of "Suppressed pi0 production at large transverse momentum in central Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: Invariant $\pi^0$ yields at midrapidity as a function of $p_T$ for minimum bias and nine centralities in $Au\ +\ Au$ at $\sqrt{s_{NN}} = 200\ GeV$ [0%–10% (80%–92%) is most central (peripheral)]. The labels "uncorr." and "corr." include systematic errors that are uncorrelated and correlated point-to-point, respectively.
description: Transverse momentum spectra of neutral pions in the range $1 &lt; p_T &lt; 10Gev/c$ have been measured at midrapidity by the PHENIX experiment at BNL RHIC in Au $+$ Au collisions at $\sqrt{s_{NN}} = 200\ GeV$. The $\pi^0$ multiplicity in central reactions is significantly below the yields measured at the same $\sqrt{s_{NN}}$ in peripheral Au $+$ Au and $p+p$ reactions scaled by the number of nucleon-nucleon collisions. For the most central bin, the supression factor is ~2.5 at $p_T = 2GeV/c$ and increases to ~4-5 at $p_T \approx 4\ GeV/c$. At larger $p_T$, the suppression remains constant within errors. The deficit is already apparent in semiperipheral reactions and increases smoothly with centrality.
DOI: 10.17182/hepdata.143254.v1/t10
title: "Fig. 1 Part 10" of "Suppressed pi0 production at large transverse momentum in central Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: Invariant $\pi^0$ yields at midrapidity as a function of $p_T$ for minimum bias and nine centralities in $Au\ +\ Au$ at $\sqrt{s_{NN}} = 200\ GeV$ [0%–10% (80%–92%) is most central (peripheral)]. The labels "uncorr." and "corr." include systematic errors that are uncorrelated and correlated point-to-point, respectively.
description: Transverse momentum spectra of neutral pions in the range $1 &lt; p_T &lt; 10Gev/c$ have been measured at midrapidity by the PHENIX experiment at BNL RHIC in Au $+$ Au collisions at $\sqrt{s_{NN}} = 200\ GeV$. The $\pi^0$ multiplicity in central reactions is significantly below the yields measured at the same $\sqrt{s_{NN}}$ in peripheral Au $+$ Au and $p+p$ reactions scaled by the number of nucleon-nucleon collisions. For the most central bin, the supression factor is ~2.5 at $p_T = 2GeV/c$ and increases to ~4-5 at $p_T \approx 4\ GeV/c$. At larger $p_T$, the suppression remains constant within errors. The deficit is already apparent in semiperipheral reactions and increases smoothly with centrality.
DOI: 10.17182/hepdata.143254.v1/t11
title: "Fig. 1 Part 11" of "Suppressed pi0 production at large transverse momentum in central Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: Invariant $\pi^0$ yields at midrapidity as a function of $p_T$ for minimum bias and nine centralities in $Au\ +\ Au$ at $\sqrt{s_{NN}} = 200\ GeV$ [0%–10% (80%–92%) is most central (peripheral)]. The labels "uncorr." and "corr." include systematic errors that are uncorrelated and correlated point-to-point, respectively.
description: Transverse momentum spectra of neutral pions in the range $1 &lt; p_T &lt; 10Gev/c$ have been measured at midrapidity by the PHENIX experiment at BNL RHIC in Au $+$ Au collisions at $\sqrt{s_{NN}} = 200\ GeV$. The $\pi^0$ multiplicity in central reactions is significantly below the yields measured at the same $\sqrt{s_{NN}}$ in peripheral Au $+$ Au and $p+p$ reactions scaled by the number of nucleon-nucleon collisions. For the most central bin, the supression factor is ~2.5 at $p_T = 2GeV/c$ and increases to ~4-5 at $p_T \approx 4\ GeV/c$. At larger $p_T$, the suppression remains constant within errors. The deficit is already apparent in semiperipheral reactions and increases smoothly with centrality.
DOI: 10.17182/hepdata.143254.v1/t5
title: "Fig. 1 Part 5" of "Suppressed pi0 production at large transverse momentum in central Au + Au collisions at s(NN)**(1/2) = 200-GeV."

description: Invariant $\pi^0$ yields at midrapidity as a function of $p_T$ for minimum bias and nine centralities in $Au\ +\ Au$ at $\sqrt{s_{NN}} = 200\ GeV$ [0%–10% (80%–92%) is most central (peripheral)]. The labels "uncorr." and "corr." include systematic errors that are uncorrelated and correlated point-to-point, respectively.
description: Transverse momentum spectra of neutral pions in the range $1 &lt; p_T &lt; 10Gev/c$ have been measured at midrapidity by the PHENIX experiment at BNL RHIC in Au $+$ Au collisions at $\sqrt{s_{NN}} = 200\ GeV$. The $\pi^0$ multiplicity in central reactions is significantly below the yields measured at the same $\sqrt{s_{NN}}$ in peripheral Au $+$ Au and $p+p$ reactions scaled by the number of nucleon-nucleon collisions. For the most central bin, the supression factor is ~2.5 at $p_T = 2GeV/c$ and increases to ~4-5 at $p_T \approx 4\ GeV/c$. At larger $p_T$, the suppression remains constant within errors. The deficit is already apparent in semiperipheral reactions and increases smoothly with centrality.