Fig. 1(a): Centrality dependence of e+e- invariant mass spectra within the STAR acceptance from Au+Au collisions and U+U collisions for pair pT < 0.15 GeV/c
60-80% Au+Au collisions
| Mee (GeV/c2) | binWidth/2 | dN/dMee | statErr | sysErr |
| 3.500e-01 | 5.00e-02 | 2.98e-06 | 3.48e-06 | 7.61e-07 |
| 4.250e-01 | 2.50e-02 | 2.61e-04 | 4.10e-05 | 5.73e-05 |
| 4.750e-01 | 2.50e-02 | 5.00e-04 | 5.90e-05 | 9.72e-05 |
| 5.500e-01 | 5.00e-02 | 3.88e-04 | 4.05e-05 | 5.94e-05 |
| 6.500e-01 | 5.00e-02 | 2.51e-04 | 2.97e-05 | 3.43e-05 |
| 7.300e-01 | 3.00e-02 | 1.99e-04 | 2.87e-05 | 2.81e-05 |
| 7.650e-01 | 5.00e-03 | 1.60e-04 | 6.29e-05 | 2.39e-05 |
| 7.850e-01 | 1.50e-02 | 2.00e-04 | 3.48e-05 | 2.81e-05 |
| 8.150e-01 | 1.50e-02 | 9.88e-05 | 3.02e-05 | 1.60e-05 |
| 8.750e-01 | 4.50e-02 | 1.07e-04 | 1.52e-05 | 1.47e-05 |
| 9.550e-01 | 3.50e-02 | 7.54e-05 | 1.34e-05 | 1.03e-05 |
| 1.010e+00 | 2.00e-02 | 8.71e-05 | 1.66e-05 | 1.21e-05 |
| 1.115e+00 | 8.50e-02 | 4.21e-05 | 6.20e-06 | 5.90e-06 |
| 1.350e+00 | 1.50e-01 | 2.07e-05 | 2.94e-06 | 2.87e-06 |
| 1.650e+00 | 1.50e-01 | 7.03e-06 | 1.75e-06 | 9.74e-07 |
| 2.000e+00 | 2.00e-01 | 5.12e-06 | 8.44e-07 | 7.02e-07 |
| 2.400e+00 | 2.00e-01 | 2.43e-06 | 5.74e-07 | 3.31e-07 |
| 2.700e+00 | 1.00e-01 | 1.28e-06 | 5.08e-07 | 1.75e-07 |
| 2.890e+00 | 9.00e-02 | 1.67e-06 | 6.06e-07 | 2.27e-07 |
| 3.005e+00 | 2.50e-02 | 3.86e-06 | 1.79e-06 | 5.29e-07 |
| 3.055e+00 | 2.50e-02 | 5.07e-06 | 2.06e-06 | 6.91e-07 |
| 3.095e+00 | 1.50e-02 | 1.54e-05 | 4.44e-06 | 2.10e-06 |
| 3.155e+00 | 4.50e-02 | 5.85e-06 | 1.68e-06 | 7.98e-07 |
| 3.400e+00 | 2.00e-01 | 5.82e-07 | 2.47e-07 | 7.97e-08 |
| 3.800e+00 | 2.00e-01 | 2.88e-07 | 1.67e-07 | 3.92e-08 |
60-80% U+U collisions
| Mee (GeV/c2) | binWidth/2 | dN/dMee | statErr | sysErr |
| 3.500e-01 | 5.00e-02 | -2.70e-06 | 5.98e-06 | 4.72e-07 |
| 4.250e-01 | 2.50e-02 | 4.20e-04 | 6.00e-05 | 8.51e-05 |
| 4.750e-01 | 2.50e-02 | 6.58e-04 | 9.09e-05 | 1.15e-04 |
| 5.500e-01 | 5.00e-02 | 5.62e-04 | 6.40e-05 | 7.21e-05 |
| 6.500e-01 | 5.00e-02 | 3.75e-04 | 4.79e-05 | 4.14e-05 |
| 7.300e-01 | 3.00e-02 | 2.78e-04 | 4.62e-05 | 3.11e-05 |
| 7.700e-01 | 1.00e-02 | 3.03e-04 | 7.11e-05 | 3.60e-05 |
| 7.900e-01 | 1.00e-02 | 3.30e-04 | 6.78e-05 | 3.70e-05 |
| 8.150e-01 | 1.50e-02 | 1.23e-04 | 5.00e-05 | 1.37e-05 |
| 8.750e-01 | 4.50e-02 | 9.18e-05 | 2.40e-05 | 9.97e-06 |
| 9.600e-01 | 4.00e-02 | 7.24e-05 | 2.11e-05 | 7.79e-06 |
| 1.020e+00 | 2.00e-02 | 1.21e-04 | 2.61e-05 | 1.32e-05 |
| 1.120e+00 | 8.00e-02 | 5.25e-05 | 1.03e-05 | 5.97e-06 |
| 1.400e+00 | 2.00e-01 | 1.98e-05 | 3.82e-06 | 2.14e-06 |
| 1.800e+00 | 2.00e-01 | 8.87e-06 | 1.88e-06 | 1.03e-06 |
| 2.300e+00 | 3.00e-01 | 2.57e-06 | 8.35e-07 | 2.76e-07 |
| 2.700e+00 | 1.00e-01 | 7.40e-07 | 5.24e-07 | 7.97e-08 |
| 2.915e+00 | 1.15e-01 | 8.08e-07 | 4.67e-07 | 8.69e-08 |
| 3.055e+00 | 2.50e-02 | 1.12e-05 | 4.05e-06 | 1.21e-06 |
| 3.100e+00 | 2.00e-02 | 2.03e-05 | 6.27e-06 | 2.19e-06 |
| 3.160e+00 | 4.00e-02 | 1.56e-06 | 1.10e-06 | 1.67e-07 |
| 3.600e+00 | 4.00e-01 | 2.66e-07 | 1.56e-07 | 2.86e-08 |
40-60% Au+Au collisions
| Mee (GeV/c2) | binWidth/2 | dN/dMee | statErr | sysErr |
| 3.500e-01 | 5.00e-02 | 1.11e-05 | 1.17e-05 | 3.58e-06 |
| 4.250e-01 | 2.50e-02 | 2.38e-04 | 1.28e-04 | 6.18e-05 |
| 4.750e-01 | 2.50e-02 | 4.70e-04 | 1.91e-04 | 9.62e-05 |
| 5.300e-01 | 3.00e-02 | 7.36e-04 | 1.79e-04 | 1.19e-04 |
| 5.900e-01 | 3.00e-02 | 5.28e-04 | 1.54e-04 | 7.63e-05 |
| 6.900e-01 | 7.00e-02 | 3.10e-04 | 7.10e-05 | 4.47e-05 |
| 8.500e-01 | 9.00e-02 | 1.80e-04 | 3.81e-05 | 2.52e-05 |
| 1.070e+00 | 1.30e-01 | 7.71e-05 | 1.82e-05 | 1.06e-05 |
| 1.350e+00 | 1.50e-01 | 2.69e-05 | 9.30e-06 | 3.71e-06 |
| 1.750e+00 | 2.50e-01 | 8.98e-06 | 3.39e-06 | 1.31e-06 |
| 2.300e+00 | 3.00e-01 | 4.68e-06 | 1.22e-06 | 6.43e-07 |
| 2.700e+00 | 1.00e-01 | 3.06e-06 | 1.07e-06 | 4.19e-07 |
| 2.890e+00 | 9.00e-02 | 2.65e-06 | 8.99e-07 | 3.63e-07 |
| 3.005e+00 | 2.50e-02 | 5.25e-06 | 2.62e-06 | 7.34e-07 |
| 3.055e+00 | 2.50e-02 | 8.81e-06 | 2.72e-06 | 1.20e-06 |
| 3.095e+00 | 1.50e-02 | 2.02e-05 | 4.90e-06 | 2.75e-06 |
| 3.130e+00 | 2.00e-02 | 9.41e-06 | 2.90e-06 | 1.31e-06 |
| 3.175e+00 | 2.50e-02 | 2.84e-06 | 1.42e-06 | 3.88e-07 |
| 3.450e+00 | 2.50e-01 | 7.79e-07 | 2.71e-07 | 1.51e-07 |
| 3.850e+00 | 1.50e-01 | 3.14e-07 | 2.22e-07 | 4.27e-08 |
40-60% U+U collisions
| Mee (GeV/c2) | binWidth/2 | dN/dMee | statErr | sysErr |
| 3.500e-01 | 5.00e-02 | -1.13e-05 | 1.78e-05 | 2.46e-06 |
| 4.600e-01 | 6.00e-02 | 3.25e-04 | 1.72e-04 | 5.74e-05 |
| 5.800e-01 | 6.00e-02 | 7.33e-04 | 1.86e-04 | 8.70e-05 |
| 7.000e-01 | 6.00e-02 | 5.14e-04 | 1.28e-04 | 6.14e-05 |
| 8.200e-01 | 6.00e-02 | 2.58e-04 | 8.88e-05 | 2.90e-05 |
| 9.400e-01 | 6.00e-02 | 2.05e-04 | 6.42e-05 | 2.29e-05 |
| 1.100e+00 | 1.00e-01 | 1.37e-04 | 3.49e-05 | 1.48e-05 |
| 1.400e+00 | 2.00e-01 | 2.14e-05 | 1.39e-05 | 2.45e-06 |
| 1.900e+00 | 3.00e-01 | 7.42e-06 | 4.65e-06 | 8.81e-07 |
| 2.400e+00 | 2.00e-01 | 6.23e-06 | 2.11e-06 | 6.70e-07 |
| 2.800e+00 | 2.00e-01 | 1.60e-06 | 1.17e-06 | 2.86e-07 |
| 3.040e+00 | 4.00e-02 | 7.99e-06 | 3.45e-06 | 8.82e-07 |
| 3.095e+00 | 1.50e-02 | 2.66e-05 | 7.73e-06 | 2.86e-06 |
| 3.130e+00 | 2.00e-02 | 8.01e-06 | 3.59e-06 | 8.91e-07 |
| 3.175e+00 | 2.50e-02 | 2.59e-06 | 1.84e-06 | 2.80e-07 |
| 3.600e+00 | 4.00e-01 | 3.42e-07 | 2.46e-07 | 5.01e-08 |
10-40% Au+Au collisions
| Mee (GeV/c2) | binWidth/2 | dN/dMee | statErr | sysErr |
| 3.500e-01 | 5.00e-02 | 1.90e-05 | 3.92e-05 | 9.52e-06 |
| 5.000e-01 | 1.00e-01 | 1.26e-03 | 3.01e-04 | 2.28e-04 |
| 6.800e-01 | 8.00e-02 | 7.10e-04 | 2.42e-04 | 1.07e-04 |
| 8.200e-01 | 6.00e-02 | 6.34e-04 | 1.77e-04 | 8.94e-05 |
| 9.400e-01 | 6.00e-02 | 2.05e-04 | 1.27e-04 | 3.17e-05 |
| 1.100e+00 | 1.00e-01 | 1.76e-04 | 6.85e-05 | 2.51e-05 |
| 1.400e+00 | 2.00e-01 | 6.99e-05 | 2.65e-05 | 9.64e-06 |
| 1.850e+00 | 2.50e-01 | 3.16e-05 | 1.01e-05 | 4.75e-06 |
| 2.350e+00 | 2.50e-01 | 6.14e-06 | 4.27e-06 | 8.54e-07 |
| 2.800e+00 | 2.00e-01 | 3.02e-06 | 2.28e-06 | 6.18e-07 |
| 3.040e+00 | 4.00e-02 | 1.38e-05 | 4.30e-06 | 2.01e-06 |
| 3.095e+00 | 1.50e-02 | 2.36e-05 | 8.36e-06 | 3.62e-06 |
| 3.155e+00 | 4.50e-02 | 6.99e-06 | 3.46e-06 | 1.17e-06 |
| 3.325e+00 | 1.25e-01 | 3.26e-06 | 1.33e-06 | 4.94e-07 |
| 3.725e+00 | 2.75e-01 | 8.52e-07 | 6.33e-07 | 1.50e-07 |
10-40% U+U collisions
| Mee (GeV/c2) | binWidth/2 | dN/dMee | statErr | sysErr |
| 3.500e-01 | 5.00e-02 | 3.19e-05 | 6.24e-05 | 1.24e-05 |
| 4.600e-01 | 6.00e-02 | 1.46e-03 | 5.95e-04 | 2.58e-04 |
| 6.400e-01 | 1.20e-01 | 1.01e-03 | 3.92e-04 | 1.09e-04 |
| 8.600e-01 | 1.00e-01 | 3.32e-04 | 2.29e-04 | 3.68e-05 |
| 1.080e+00 | 1.20e-01 | 2.39e-04 | 1.29e-04 | 2.72e-05 |
| 1.500e+00 | 3.00e-01 | 3.17e-05 | 3.88e-05 | 4.48e-06 |
| 2.200e+00 | 4.00e-01 | 9.09e-06 | 1.03e-05 | 1.29e-06 |
| 2.800e+00 | 2.00e-01 | 5.74e-06 | 4.02e-06 | 6.67e-07 |
| 3.040e+00 | 4.00e-02 | 8.85e-06 | 6.21e-06 | 9.89e-07 |
| 3.095e+00 | 1.50e-02 | 5.22e-05 | 1.34e-05 | 5.63e-06 |
| 3.155e+00 | 4.50e-02 | 1.98e-06 | 5.62e-06 | 4.10e-07 |
| 3.400e+00 | 2.00e-01 | 7.37e-07 | 1.70e-06 | 8.11e-08 |
| 3.800e+00 | 2.00e-01 | -5.49e-07 | 1.21e-06 | 3.54e-07 |
Fig. 1(b): Corresponding data/cocktail ratio in three different centrality bins
60-80% Au+Au collisions
| Mee (GeV/c2) | binWidth/2 | data/cocktail | statErr | sysErr |
| 4.250e-01 | 2.50e-02 | 13.76 | 2.16 | 3.02 |
| 4.750e-01 | 2.50e-02 | 15.81 | 1.87 | 3.08 |
| 5.500e-01 | 5.00e-02 | 12.16 | 1.27 | 1.86 |
| 6.500e-01 | 5.00e-02 | 11.64 | 1.38 | 1.59 |
| 7.300e-01 | 3.00e-02 | 8.98 | 1.30 | 1.27 |
| 7.650e-01 | 5.00e-03 | 3.25 | 1.28 | 0.49 |
| 7.850e-01 | 1.50e-02 | 1.91 | 0.33 | 0.27 |
| 8.150e-01 | 1.50e-02 | 5.81 | 1.77 | 0.94 |
| 8.750e-01 | 4.50e-02 | 11.73 | 1.66 | 1.61 |
| 9.550e-01 | 3.50e-02 | 7.71 | 1.37 | 1.05 |
| 1.010e+00 | 2.00e-02 | 1.36 | 0.26 | 0.19 |
| 1.115e+00 | 8.50e-02 | 7.63 | 1.12 | 1.07 |
| 1.350e+00 | 1.50e-01 | 11.68 | 1.66 | 1.62 |
| 1.650e+00 | 1.50e-01 | 9.68 | 2.41 | 1.34 |
| 2.000e+00 | 2.00e-01 | 18.63 | 3.07 | 2.55 |
| 2.400e+00 | 2.00e-01 | 23.43 | 5.54 | 3.19 |
| 2.700e+00 | 1.00e-01 | 21.31 | 8.46 | 2.91 |
| 2.890e+00 | 9.00e-02 | 30.24 | 10.97 | 4.12 |
| 3.005e+00 | 2.50e-02 | 41.92 | 19.38 | 5.74 |
| 3.055e+00 | 2.50e-02 | 14.84 | 6.04 | 2.02 |
| 3.095e+00 | 1.50e-02 | 23.21 | 6.70 | 3.16 |
| 3.155e+00 | 4.50e-02 | 35.05 | 10.06 | 4.78 |
| 3.400e+00 | 2.00e-01 | 37.82 | 16.01 | 5.18 |
| 3.800e+00 | 2.00e-01 | 28.26 | 16.41 | 3.85 |
60-80% U+U collisions
| Mee (GeV/c2) | binWidth/2 | data/cocktail | statErr | sysErr |
| 4.250e-01 | 2.50e-02 | 21.17 | 3.02 | 4.29 |
| 4.750e-01 | 2.50e-02 | 19.92 | 2.75 | 3.49 |
| 5.500e-01 | 5.00e-02 | 16.86 | 1.92 | 2.16 |
| 6.500e-01 | 5.00e-02 | 16.67 | 2.13 | 1.84 |
| 7.300e-01 | 3.00e-02 | 11.99 | 1.99 | 1.34 |
| 7.700e-01 | 1.00e-02 | 3.49 | 0.82 | 0.42 |
| 7.900e-01 | 1.00e-02 | 3.17 | 0.65 | 0.36 |
| 8.150e-01 | 1.50e-02 | 6.94 | 2.81 | 0.77 |
| 8.750e-01 | 4.50e-02 | 9.61 | 2.52 | 1.04 |
| 9.600e-01 | 4.00e-02 | 6.27 | 1.83 | 0.67 |
| 1.020e+00 | 2.00e-02 | 1.78 | 0.38 | 0.19 |
| 1.120e+00 | 8.00e-02 | 11.73 | 2.31 | 1.33 |
| 1.400e+00 | 2.00e-01 | 12.12 | 2.34 | 1.31 |
| 1.800e+00 | 2.00e-01 | 17.71 | 3.76 | 2.05 |
| 2.300e+00 | 3.00e-01 | 17.93 | 5.82 | 1.93 |
| 2.700e+00 | 1.00e-01 | 11.82 | 8.37 | 1.27 |
| 2.915e+00 | 1.15e-01 | 12.26 | 7.09 | 1.32 |
| 3.055e+00 | 2.50e-02 | 31.60 | 11.37 | 3.40 |
| 3.100e+00 | 2.00e-02 | 31.42 | 9.70 | 3.38 |
| 3.160e+00 | 4.00e-02 | 11.84 | 8.38 | 1.27 |
| 3.600e+00 | 4.00e-01 | 19.98 | 11.71 | 2.15 |
40-60% Au+Au collisions
| Mee (GeV/c2) | binWidth/2 | data/cocktail | statErr | sysErr |
| 4.250e-01 | 2.50e-02 | 4.31 | 2.32 | 1.12 |
| 4.750e-01 | 2.50e-02 | 4.76 | 1.93 | 0.98 |
| 5.300e-01 | 3.00e-02 | 6.75 | 1.64 | 1.09 |
| 5.900e-01 | 3.00e-02 | 5.16 | 1.50 | 0.74 |
| 6.900e-01 | 7.00e-02 | 4.15 | 0.95 | 0.60 |
| 8.500e-01 | 9.00e-02 | 2.02 | 0.43 | 0.28 |
| 1.070e+00 | 1.30e-01 | 1.62 | 0.38 | 0.22 |
| 1.350e+00 | 1.50e-01 | 3.62 | 1.25 | 0.50 |
| 1.750e+00 | 2.50e-01 | 3.73 | 1.41 | 0.55 |
| 2.300e+00 | 3.00e-01 | 8.15 | 2.13 | 1.12 |
| 2.700e+00 | 1.00e-01 | 12.52 | 4.40 | 1.71 |
| 2.890e+00 | 9.00e-02 | 12.36 | 4.19 | 1.70 |
| 3.005e+00 | 2.50e-02 | 15.74 | 7.87 | 2.20 |
| 3.055e+00 | 2.50e-02 | 7.44 | 2.30 | 1.01 |
| 3.095e+00 | 1.50e-02 | 8.85 | 2.15 | 1.21 |
| 3.130e+00 | 2.00e-02 | 8.87 | 2.73 | 1.23 |
| 3.175e+00 | 2.50e-02 | 13.91 | 6.97 | 1.90 |
| 3.450e+00 | 2.50e-01 | 12.51 | 4.36 | 2.42 |
| 3.850e+00 | 1.50e-01 | 9.70 | 6.86 | 1.32 |
40-60% U+U collisions
| Mee (GeV/c2) | binWidth/2 | data/cocktail | statErr | sysErr |
| 4.600e-01 | 6.00e-02 | 3.52 | 1.86 | 0.62 |
| 5.800e-01 | 6.00e-02 | 6.37 | 1.62 | 0.76 |
| 7.000e-01 | 6.00e-02 | 6.24 | 1.55 | 0.75 |
| 8.200e-01 | 6.00e-02 | 1.96 | 0.67 | 0.22 |
| 9.400e-01 | 6.00e-02 | 5.00 | 1.56 | 0.56 |
| 1.100e+00 | 1.00e-01 | 2.45 | 0.62 | 0.27 |
| 1.400e+00 | 2.00e-01 | 2.87 | 1.86 | 0.33 |
| 1.900e+00 | 3.00e-01 | 4.01 | 2.51 | 0.48 |
| 2.400e+00 | 2.00e-01 | 12.75 | 4.32 | 1.37 |
| 2.800e+00 | 2.00e-01 | 6.05 | 4.42 | 1.08 |
| 3.040e+00 | 4.00e-02 | 8.02 | 3.46 | 0.89 |
| 3.095e+00 | 1.50e-02 | 10.29 | 2.99 | 1.11 |
| 3.130e+00 | 2.00e-02 | 6.65 | 2.98 | 0.74 |
| 3.175e+00 | 2.50e-02 | 11.19 | 7.92 | 1.21 |
| 3.600e+00 | 4.00e-01 | 5.91 | 4.24 | 0.87 |
10-40% Au+Au collisions
| Mee (GeV/c2) | binWidth/2 | data/cocktail | statErr | sysErr |
| 5.000e-01 | 1.00e-01 | 4.04 | 0.97 | 0.73 |
| 6.800e-01 | 8.00e-02 | 2.45 | 0.84 | 0.37 |
| 8.200e-01 | 6.00e-02 | 1.67 | 0.47 | 0.24 |
| 9.400e-01 | 6.00e-02 | 1.53 | 0.95 | 0.24 |
| 1.100e+00 | 1.00e-01 | 1.18 | 0.46 | 0.17 |
| 1.400e+00 | 2.00e-01 | 2.50 | 0.95 | 0.34 |
| 1.850e+00 | 2.50e-01 | 4.09 | 1.31 | 0.62 |
| 2.350e+00 | 2.50e-01 | 2.96 | 2.06 | 0.41 |
| 2.800e+00 | 2.00e-01 | 3.39 | 2.56 | 0.69 |
| 3.040e+00 | 4.00e-02 | 5.74 | 1.79 | 0.83 |
| 3.095e+00 | 1.50e-02 | 3.95 | 1.40 | 0.61 |
| 3.155e+00 | 4.50e-02 | 4.26 | 2.11 | 0.71 |
| 3.325e+00 | 1.25e-01 | 11.46 | 4.68 | 1.74 |
| 3.725e+00 | 2.75e-01 | 5.15 | 3.83 | 0.91 |
10-40% U+U collisions
| Mee (GeV/c2) | binWidth/2 | data/cocktail | statErr | sysErr |
| 4.600e-01 | 6.00e-02 | 4.71 | 1.91 | 0.83 |
| 6.400e-01 | 1.20e-01 | 2.64 | 1.02 | 0.29 |
| 8.600e-01 | 1.00e-01 | 1.00 | 0.69 | 0.11 |
| 1.080e+00 | 1.20e-01 | 1.36 | 0.73 | 0.15 |
| 1.500e+00 | 3.00e-01 | 1.19 | 1.45 | 0.17 |
| 2.200e+00 | 4.00e-01 | 2.27 | 2.58 | 0.32 |
| 2.800e+00 | 2.00e-01 | 5.40 | 3.78 | 0.63 |
| 3.040e+00 | 4.00e-02 | 3.07 | 2.16 | 0.34 |
| 3.095e+00 | 1.50e-02 | 7.32 | 1.88 | 0.79 |
| 3.155e+00 | 4.50e-02 | 1.01 | 2.87 | 0.21 |
| 3.400e+00 | 2.00e-01 | 2.45 | 5.66 | 0.27 |
| 3.800e+00 | 2.00e-01 | -2.99 | 6.56 | 1.93 |
Fig. 2: The e+e- pair pT distributions within the STAR acceptance for different mass regions in 60-80% Au+Au and U+U collisions
0.40< Mee <0.76 GeV/c2 in Au+Au collisions
| pT (GeV/c) | binWidth/2 | dN/dpT | statErr | sysErr |
| 5.00e-03 | 5.00e-03 | 3.93e-04 | 6.50e-05 | 6.12e-05 |
| 1.50e-02 | 5.00e-03 | 1.12e-03 | 1.08e-04 | 1.73e-04 |
| 2.50e-02 | 5.00e-03 | 1.94e-03 | 1.35e-04 | 2.92e-04 |
| 3.50e-02 | 5.00e-03 | 2.04e-03 | 1.50e-04 | 3.02e-04 |
| 4.50e-02 | 5.00e-03 | 1.80e-03 | 1.58e-04 | 2.59e-04 |
| 6.00e-02 | 1.00e-02 | 1.33e-03 | 1.17e-04 | 1.94e-04 |
| 1.10e-01 | 4.00e-02 | 1.96e-04 | 6.50e-05 | 2.81e-05 |
| 2.25e-01 | 7.50e-02 | 1.65e-04 | 5.18e-05 | 2.37e-05 |
| 4.00e-01 | 1.00e-01 | 1.28e-04 | 4.26e-05 | 1.84e-05 |
| 6.00e-01 | 1.00e-01 | 1.65e-04 | 3.57e-05 | 2.36e-05 |
| 8.50e-01 | 1.50e-01 | 1.52e-04 | 2.11e-05 | 2.08e-05 |
0.40< Mee <0.76 GeV/c2 in U+U collisions
| pT (GeV/c) | binWidth/2 | dN/dpT | statErr | sysErr |
| 5.00e-03 | 5.00e-03 | 6.60e-04 | 1.02e-04 | 8.54e-05 |
| 1.50e-02 | 5.00e-03 | 2.09e-03 | 1.82e-04 | 2.68e-04 |
| 2.50e-02 | 5.00e-03 | 2.88e-03 | 2.23e-04 | 3.60e-04 |
| 3.50e-02 | 5.00e-03 | 3.41e-03 | 2.42e-04 | 4.18e-04 |
| 4.50e-02 | 5.00e-03 | 2.20e-03 | 2.51e-04 | 2.65e-04 |
| 6.50e-02 | 1.50e-02 | 1.16e-03 | 1.52e-04 | 1.40e-04 |
| 1.15e-01 | 3.50e-02 | 2.76e-04 | 1.10e-04 | 3.37e-05 |
| 2.25e-01 | 7.50e-02 | 1.64e-04 | 8.24e-05 | 2.19e-05 |
| 4.00e-01 | 1.00e-01 | 1.47e-04 | 6.81e-05 | 1.74e-05 |
| 6.00e-01 | 1.00e-01 | 1.33e-04 | 5.80e-05 | 1.64e-05 |
| 8.50e-01 | 1.50e-01 | 1.06e-04 | 3.46e-05 | 1.18e-05 |
0.76< Mee <1.20 GeV/c2 in Au+Au collisions
| pT (GeV/c) | binWidth/2 | dN/dpT | statErr | sysErr |
| 5.00e-03 | 5.00e-03 | 3.63e-05 | 1.72e-05 | 5.12e-06 |
| 1.50e-02 | 5.00e-03 | 2.55e-04 | 3.73e-05 | 3.51e-05 |
| 3.00e-02 | 1.00e-02 | 4.61e-04 | 3.70e-05 | 6.33e-05 |
| 4.50e-02 | 5.00e-03 | 5.35e-04 | 5.95e-05 | 7.32e-05 |
| 6.50e-02 | 1.50e-02 | 3.83e-04 | 3.75e-05 | 5.27e-05 |
| 1.15e-01 | 3.50e-02 | 1.04e-04 | 2.98e-05 | 1.51e-05 |
| 2.25e-01 | 7.50e-02 | 1.45e-04 | 2.64e-05 | 2.04e-05 |
| 4.00e-01 | 1.00e-01 | 1.78e-04 | 2.62e-05 | 2.51e-05 |
| 6.00e-01 | 1.00e-01 | 2.09e-04 | 2.43e-05 | 2.86e-05 |
| 8.50e-01 | 1.50e-01 | 1.15e-04 | 1.61e-05 | 1.61e-05 |
0.76< Mee <1.20 GeV/c2 in U+U collisions
| pT (GeV/c) | binWidth/2 | dN/dpT | statErr | sysErr |
| 5.00e-03 | 5.00e-03 | 8.98e-05 | 3.37e-05 | 1.10e-05 |
| 1.50e-02 | 5.00e-03 | 3.95e-04 | 6.20e-05 | 4.37e-05 |
| 2.50e-02 | 5.00e-03 | 6.04e-04 | 7.76e-05 | 6.53e-05 |
| 3.50e-02 | 5.00e-03 | 8.59e-04 | 9.24e-05 | 9.30e-05 |
| 5.00e-02 | 1.00e-02 | 5.63e-04 | 7.14e-05 | 6.35e-05 |
| 1.05e-01 | 4.50e-02 | 1.41e-04 | 4.09e-05 | 1.56e-05 |
| 2.25e-01 | 7.50e-02 | 1.85e-04 | 4.31e-05 | 2.06e-05 |
| 4.00e-01 | 1.00e-01 | 1.43e-04 | 4.30e-05 | 1.58e-05 |
| 6.00e-01 | 1.00e-01 | 2.11e-04 | 4.01e-05 | 2.36e-05 |
| 8.50e-01 | 1.50e-01 | 1.58e-04 | 2.65e-05 | 1.71e-05 |
1.20< Mee <2.60 GeV/c2 in Au+Au collisions
| pT (GeV/c) | binWidth/2 | dN/dpT | statErr | sysErr |
| 5.00e-03 | 5.00e-03 | 3.14e-05 | 1.09e-05 | 4.45e-06 |
| 1.50e-02 | 5.00e-03 | 7.09e-05 | 1.81e-05 | 9.72e-06 |
| 3.00e-02 | 1.00e-02 | 1.44e-04 | 1.87e-05 | 1.97e-05 |
| 4.50e-02 | 5.00e-03 | 2.15e-04 | 3.11e-05 | 2.96e-05 |
| 7.00e-02 | 2.00e-02 | 1.03e-04 | 1.51e-05 | 1.41e-05 |
| 1.20e-01 | 3.00e-02 | 2.52e-05 | 1.33e-05 | 4.11e-06 |
| 2.25e-01 | 7.50e-02 | 2.83e-05 | 1.07e-05 | 5.00e-06 |
| 4.50e-01 | 1.50e-01 | 2.52e-05 | 9.26e-06 | 3.66e-06 |
| 8.00e-01 | 2.00e-01 | 3.56e-05 | 8.06e-06 | 5.06e-06 |
1.20< Mee <2.60 GeV/c2 in U+U collisions
| pT (GeV/c) | binWidth/2 | dN/dpT | statErr | sysErr |
| 5.00e-03 | 5.00e-03 | 9.69e-06 | 6.86e-06 | 1.09e-06 |
| 1.50e-02 | 5.00e-03 | 8.83e-05 | 2.83e-05 | 9.77e-06 |
| 2.50e-02 | 5.00e-03 | 2.51e-04 | 4.45e-05 | 2.71e-05 |
| 4.00e-02 | 1.00e-02 | 2.32e-04 | 3.44e-05 | 2.52e-05 |
| 6.00e-02 | 1.00e-02 | 1.45e-04 | 3.45e-05 | 1.66e-05 |
| 8.50e-02 | 1.50e-02 | 6.79e-05 | 2.61e-05 | 7.58e-06 |
| 1.50e-01 | 5.00e-02 | 3.85e-05 | 1.82e-05 | 4.37e-06 |
| 4.00e-01 | 2.00e-01 | 1.69e-05 | 1.27e-05 | 2.01e-06 |
| 8.00e-01 | 2.00e-01 | 2.64e-05 | 1.31e-05 | 2.84e-06 |
Fig. 3(a): The low-pT (pT < 0.15 GeV/c) e+e- excess mass spectra (data - cocktail) within the STAR acceptance in 60-80% centrality
60-80% Au+Au collisions
| Mee (GeV/c2) | binWidth/2 | dN/dMee | statErr | sysErr |
| 3.500e-01 | 5.00e-02 | 2.53e-06 | 3.48e-06 | 7.66e-07 |
| 4.250e-01 | 2.50e-02 | 2.42e-04 | 4.10e-05 | 5.74e-05 |
| 4.750e-01 | 2.50e-02 | 4.68e-04 | 5.90e-05 | 9.75e-05 |
| 5.500e-01 | 5.00e-02 | 3.56e-04 | 4.05e-05 | 6.02e-05 |
| 6.500e-01 | 5.00e-02 | 2.29e-04 | 2.97e-05 | 3.50e-05 |
| 7.300e-01 | 3.00e-02 | 1.77e-04 | 2.87e-05 | 2.90e-05 |
| 7.650e-01 | 5.00e-03 | 1.11e-04 | 6.29e-05 | 2.84e-05 |
| 7.850e-01 | 1.50e-02 | 9.53e-05 | 3.48e-05 | 4.37e-05 |
| 8.150e-01 | 1.50e-02 | 8.18e-05 | 3.02e-05 | 1.65e-05 |
| 8.750e-01 | 4.50e-02 | 9.83e-05 | 1.52e-05 | 1.48e-05 |
| 9.550e-01 | 3.50e-02 | 6.56e-05 | 1.34e-05 | 1.04e-05 |
| 1.010e+00 | 2.00e-02 | 2.32e-05 | 1.66e-05 | 1.38e-05 |
| 1.115e+00 | 8.50e-02 | 3.66e-05 | 6.20e-06 | 5.95e-06 |
| 1.350e+00 | 1.50e-01 | 1.89e-05 | 2.94e-06 | 2.88e-06 |
| 1.650e+00 | 1.50e-01 | 6.30e-06 | 1.75e-06 | 9.80e-07 |
| 2.000e+00 | 2.00e-01 | 4.85e-06 | 8.44e-07 | 7.03e-07 |
| 2.400e+00 | 2.00e-01 | 2.32e-06 | 5.74e-07 | 3.31e-07 |
60-80% U+U collisions
| Mee (GeV/c2) | binWidth/2 | dN/dMee | statErr | sysErr |
| 3.500e-01 | 5.00e-02 | -3.17e-06 | 5.98e-06 | 4.80e-07 |
| 4.250e-01 | 2.50e-02 | 4.01e-04 | 6.00e-05 | 8.52e-05 |
| 4.750e-01 | 2.50e-02 | 6.25e-04 | 9.09e-05 | 1.16e-04 |
| 5.500e-01 | 5.00e-02 | 5.29e-04 | 6.40e-05 | 7.29e-05 |
| 6.500e-01 | 5.00e-02 | 3.53e-04 | 4.79e-05 | 4.21e-05 |
| 7.300e-01 | 3.00e-02 | 2.55e-04 | 4.62e-05 | 3.20e-05 |
| 7.700e-01 | 1.00e-02 | 2.16e-04 | 7.11e-05 | 4.54e-05 |
| 7.900e-01 | 1.00e-02 | 2.26e-04 | 6.78e-05 | 4.95e-05 |
| 8.150e-01 | 1.50e-02 | 1.06e-04 | 5.00e-05 | 1.44e-05 |
| 8.750e-01 | 4.50e-02 | 8.23e-05 | 2.40e-05 | 1.01e-05 |
| 9.600e-01 | 4.00e-02 | 6.09e-05 | 2.11e-05 | 7.93e-06 |
| 1.020e+00 | 2.00e-02 | 5.30e-05 | 2.61e-05 | 1.50e-05 |
| 1.120e+00 | 8.00e-02 | 4.81e-05 | 1.03e-05 | 6.00e-06 |
| 1.400e+00 | 2.00e-01 | 1.81e-05 | 3.82e-06 | 2.16e-06 |
| 1.800e+00 | 2.00e-01 | 8.37e-06 | 1.88e-06 | 1.03e-06 |
| 2.300e+00 | 3.00e-01 | 2.43e-06 | 8.35e-07 | 2.77e-07 |
Fig. 3(b): The low-pT (pT < 0.15 GeV/c) e+e- excess mass spectra (data - cocktail) within the STAR acceptance in 40-60% centrality
40-60% Au+Au collisions
| Mee (GeV/c2) | binWidth/2 | dN/dMee | statErr | sysErr |
| 3.500e-01 | 5.00e-02 | 9.83e-06 | 1.17e-05 | 3.59e-06 |
| 4.250e-01 | 2.50e-02 | 1.83e-04 | 1.28e-04 | 6.29e-05 |
| 4.750e-01 | 2.50e-02 | 3.71e-04 | 1.91e-04 | 9.94e-05 |
| 5.300e-01 | 3.00e-02 | 6.27e-04 | 1.79e-04 | 1.23e-04 |
| 5.900e-01 | 3.00e-02 | 4.26e-04 | 1.54e-04 | 8.17e-05 |
| 6.900e-01 | 7.00e-02 | 2.35e-04 | 7.10e-05 | 4.96e-05 |
| 8.500e-01 | 9.00e-02 | 9.10e-05 | 3.81e-05 | 3.45e-05 |
| 1.070e+00 | 1.30e-01 | 2.95e-05 | 1.82e-05 | 1.20e-05 |
| 1.350e+00 | 1.50e-01 | 1.95e-05 | 9.30e-06 | 3.88e-06 |
| 1.750e+00 | 2.50e-01 | 6.57e-06 | 3.39e-06 | 1.37e-06 |
| 2.300e+00 | 3.00e-01 | 4.11e-06 | 1.22e-06 | 6.49e-07 |
40-60% U+U collisions
| Mee (GeV/c2) | binWidth/2 | dN/dMee | statErr | sysErr |
| 3.500e-01 | 5.00e-02 | -1.28e-05 | 1.78e-05 | 2.47e-06 |
| 4.600e-01 | 6.00e-02 | 2.33e-04 | 1.72e-04 | 6.17e-05 |
| 5.800e-01 | 6.00e-02 | 6.18e-04 | 1.86e-04 | 9.30e-05 |
| 7.000e-01 | 6.00e-02 | 4.32e-04 | 1.28e-04 | 6.58e-05 |
| 8.200e-01 | 6.00e-02 | 1.26e-04 | 8.88e-05 | 4.68e-05 |
| 9.400e-01 | 6.00e-02 | 1.64e-04 | 6.42e-05 | 2.36e-05 |
| 1.100e+00 | 1.00e-01 | 8.10e-05 | 3.49e-05 | 1.62e-05 |
| 1.400e+00 | 2.00e-01 | 1.39e-05 | 1.39e-05 | 2.70e-06 |
| 1.900e+00 | 3.00e-01 | 5.57e-06 | 4.65e-06 | 9.27e-07 |
| 2.400e+00 | 2.00e-01 | 5.74e-06 | 2.11e-06 | 6.75e-07 |
Fig. 3(c): The centrality dependence of integrated excess yields in the mass regions of 0.4-0.76, 0.76-1.2, and 1.2-2.6 GeV/c2 in Au+Au and U+U collisions.
0.40-0.76 GeV/c2 in Au+Au collisions
| Npart | Excess Yield | statErr | sysErr |
| 14.386 | 1.04e-04 | 6.40e-06 | 1.83e-05 |
| 27.383 | 1.06e-04 | 1.12e-05 | 2.00e-05 |
| 62.442 | 1.24e-04 | 2.08e-05 | 2.72e-05 |
0.40-0.76 GeV/c2 in U+U collisions
| Npart | Excess Yield | statErr | sysErr |
| 14.719 | 1.47e-04 | 9.78e-06 | 2.25e-05 |
| 29.280 | 1.63e-04 | 1.79e-05 | 2.51e-05 |
| 69.514 | 1.54e-04 | 3.41e-05 | 2.65e-05 |
0.76-1.20 GeV/c2 in Au+Au collisions
| Npart | Excess Yield | statErr | sysErr |
| 14.386 | 2.66e-05 | 2.64e-06 | 4.78e-06 |
| 27.383 | 2.80e-05 | 4.43e-06 | 6.19e-06 |
| 62.442 | 2.41e-05 | 8.34e-06 | 9.26e-06 |
0.76-1.20 GeV/c2 in U+U collisions
| Npart | Excess Yield | statErr | sysErr |
| 14.719 | 2.70e-05 | 4.12e-06 | 3.90e-06 |
| 29.280 | 4.17e-05 | 7.42e-06 | 6.97e-06 |
| 69.514 | 5.11e-05 | 1.49e-05 | 1.12e-05 |
1.20-2.60 GeV/c2 in Au+Au collisions
| Npart | Excess Yield | statErr | sysErr |
| 14.386 | 1.06e-05 | 1.21e-06 | 1.55e-06 |
| 27.383 | 1.06e-05 | 1.87e-06 | 1.65e-06 |
| 62.442 | 1.16e-05 | 3.35e-06 | 2.23e-06 |
1.20-2.60 GeV/c2 in U+U collisions
| Npart | Excess Yield | statErr | sysErr |
| 14.719 | 9.78e-06 | 1.81e-06 | 1.12e-06 |
| 29.280 | 1.52e-05 | 3.12e-06 | 1.95e-06 |
| 69.514 | 1.12e-05 | 6.26e-06 | 1.90e-06 |
Fig. 4(a): The p2T distributions of excess yields within the STAR acceptance
0.40< Mee <0.76 GeV/c2 in 60-80% Au+Au collisions
| p2T ((GeV/c)2) | binWidth/2 | d2N/dp2T/dy | statErr | sysErr |
| 2.00e-04 | 2.00e-04 | 1.85e-02 | 1.58e-03 | 2.89e-03 |
| 6.50e-04 | 2.50e-04 | 1.91e-02 | 1.35e-03 | 2.92e-03 |
| 1.25e-03 | 3.50e-04 | 1.43e-02 | 1.07e-03 | 2.16e-03 |
| 2.05e-03 | 4.50e-04 | 9.72e-03 | 8.80e-04 | 1.44e-03 |
| 3.05e-03 | 5.50e-04 | 5.91e-03 | 7.47e-04 | 9.04e-04 |
| 4.25e-03 | 6.50e-04 | 4.80e-03 | 6.41e-04 | 7.43e-04 |
| 5.65e-03 | 7.50e-04 | 2.87e-03 | 5.71e-04 | 4.69e-04 |
0.40< Mee <0.76 GeV/c2 in 60-80% U+U collisions
| p2T ((GeV/c)2) | binWidth/2 | d2N/dp2T/dy | statErr | sysErr |
| 2.00e-04 | 2.00e-04 | 3.41e-02 | 2.61e-03 | 4.41e-03 |
| 1.00e-03 | 6.00e-04 | 2.58e-02 | 1.37e-03 | 3.23e-03 |
| 2.05e-03 | 4.50e-04 | 1.20e-02 | 1.39e-03 | 1.47e-03 |
| 3.05e-03 | 5.50e-04 | 7.87e-03 | 1.17e-03 | 1.00e-03 |
| 5.00e-03 | 1.40e-03 | 2.80e-03 | 6.73e-04 | 3.69e-04 |
Fig. 4(b): The p2T distributions of excess yields within the STAR acceptance
0.76< Mee <1.20 GeV/c2 in 60-80% Au+Au collisions
| p2T ((GeV/c)2) | binWidth/2 | d2N/dp2T/dy | statErr | sysErr |
| 2.00e-04 | 2.00e-04 | 3.40e-03 | 5.16e-04 | 5.00e-04 |
| 6.50e-04 | 2.50e-04 | 4.14e-03 | 4.73e-04 | 5.97e-04 |
| 1.25e-03 | 3.50e-04 | 3.27e-03 | 4.07e-04 | 4.83e-04 |
| 2.05e-03 | 4.50e-04 | 2.76e-03 | 3.30e-04 | 4.09e-04 |
| 3.05e-03 | 5.50e-04 | 2.18e-03 | 2.93e-04 | 3.31e-04 |
| 5.00e-03 | 1.40e-03 | 9.17e-04 | 1.65e-04 | 1.70e-04 |
0.76< Mee <1.20 GeV/c2 in 60-80% U+U collisions
| p2T ((GeV/c)2) | binWidth/2 | d2N/dp2T/dy | statErr | sysErr |
| 2.00e-04 | 2.00e-04 | 5.82e-03 | 8.81e-04 | 6.75e-04 |
| 1.00e-03 | 6.00e-04 | 5.86e-03 | 5.02e-04 | 6.59e-04 |
| 2.05e-03 | 4.50e-04 | 3.17e-03 | 5.49e-04 | 3.83e-04 |
| 3.05e-03 | 5.50e-04 | 2.14e-03 | 4.66e-04 | 2.75e-04 |
| 5.00e-03 | 1.40e-03 | 9.80e-04 | 2.61e-04 | 1.38e-04 |
Fig. 4(c): The p2T distributions of excess yields within the STAR acceptance
1.20< Mee <2.60 GeV/c2 in 60-80% Au+Au collisions
| p2T ((GeV/c)2) | binWidth/2 | d2N/dp2T/dy | statErr | sysErr |
| 2.00e-04 | 2.00e-04 | 1.29e-03 | 2.65e-04 | 1.81e-04 |
| 6.50e-04 | 2.50e-04 | 1.43e-03 | 2.51e-04 | 2.04e-04 |
| 1.25e-03 | 3.50e-04 | 1.02e-03 | 1.96e-04 | 1.43e-04 |
| 2.60e-03 | 1.00e-03 | 7.89e-04 | 1.06e-04 | 1.12e-04 |
| 5.00e-03 | 1.40e-03 | 3.86e-04 | 7.87e-05 | 5.64e-05 |
1.20< Mee <2.60 GeV/c2 in 60-80% U+U collisions
| p2T ((GeV/c)2) | binWidth/2 | d2N/dp2T/dy | statErr | sysErr |
| 2.00e-04 | 2.00e-04 | 1.14e-03 | 3.78e-04 | 1.28e-04 |
| 6.50e-04 | 2.50e-04 | 2.48e-03 | 4.45e-04 | 2.71e-04 |
| 1.25e-03 | 3.50e-04 | 1.80e-03 | 3.58e-04 | 1.96e-04 |
| 2.05e-03 | 4.50e-04 | 1.17e-03 | 2.64e-04 | 1.30e-04 |
| 3.05e-03 | 5.50e-04 | 8.35e-04 | 2.42e-04 | 9.73e-05 |
| 5.00e-03 | 1.40e-03 | 3.48e-04 | 1.07e-04 | 4.27e-05 |
Fig. 4(d): The invariant mass and collision species dependence of √<p2T>
60-80% Au+Au collisions
| Mass Region (GeV/c2) | √<p2T> (MeV/c) | Err (stat.+sys.) |
| 0.40 - 0.76 | 50.86 | 2.51 |
| 0.76 - 1.20 | 56.19 | 4.50 |
| 1.20 - 2.60 | 59.79 | 7.54 |
60-80% U+U collisions
| Mass Region (GeV/c2) | √<p2T> (MeV/c) | Err (stat.+sys.) |
| 0.40 - 0.76 | 43.01 | 2.26 |
| 0.76 - 1.20 | 48.29 | 3.91 |
| 1.20 - 2.60 | 49.92 | 5.05 |