STAR Physics Database

Midrapidity Antiproton-to-Proton Ratio from Au+Au Collisions at sqrt(s_nn) = 130 GeV
C. Adler et al., Phys. Rev. Lett. 86, 4778-4782 (2001).

Erratum: Midrapidity Antiproton-to-Proton Ratio from Au+Au Collisions at sqrt(s_nn) = 130 GeV
C. Adler et al., Phys. Rev. Lett. 90, 119903(E) (2003).

Fig 2a. pbar over p ratio vs. p_t
Only statistical errors are listed. Data is for the rapidity range 0.3 < |y| < 0.4, minimum bias collisions.

Original publication Erratum publication

p_t(GeV/c) ratio p_t(GeV/c) ratio

0.45 0.656 +/- 0.016 0.45 0.737 +/- 0.029

0.55 0.660 +/- 0.014 0.55 0.719 +/- 0.020

0.65 0.625 +/- 0.014 0.65 0.743 +/- 0.015

0.75 0.654 +/- 0.016 0.75 0.741 +/- 0.012

0.85 0.643 +/- 0.017 0.85 0.725 +/- 0.010

0.95 0.611 +/- 0.104 0.95 0.729 +/- 0.010

Fig 2b. pbar over p ratio vs. rapidity, 0.6 < p_T < 0.8 GeV/c
Only statistical errors are listed. Data is for the p_T range 0.6 < p_T < 0.8, minimum bias collisions.

Original publication Erratum publication

y ratio y ratio

-0.45 0.643 +/- 0.026 -0.45 0.732 +/- 0.010

-0.35 0.622 +/- 0.026 -0.35 0.732 +/- 0.010

-0.25 0.659 +/- 0.027 -0.25 0.724 +/- 0.010

-0.15 0.647 +/- 0.027 -0.15 0.750 +/- 0.010

-0.05 0.680 +/- 0.028 -0.05 0.722 +/- 0.010

0.05 0.699 +/- 0.029 0.05 0.717 +/- 0.010

0.15 0.619 +/- 0.026 0.15 0.713 +/- 0.010

0.25 0.607 +/- 0.025 0.25 0.713 +/- 0.010

0.35 0.605 +/- 0.025 0.35 0.750 +/- 0.010

0.45 0.675 +/- 0.029 0.45 0.725 +/- 0.010

Fig 2c. pbar over p ratio vs. centrality (n_ch/n_max)
Only statistical errors are listed. Data is for particles with |y| < 0.3, 0.6 < p_T < 0.8

Original publication Erratum publication

n_ch/n_max ratio n_ch/n_max ratio

0.067 0.696 +/- 0.042 0.067 0.780+/-0.020

0.175 0.668 +/- 0.035 0.175 0.757 +/- 0.017

0.282 0.660 +/- 0.031 0.282 0.746 +/- 0.015

0.391 0.643 +/- 0.030 0.391 0.726 +/- 0.014

0.502 0.647 +/- 0.022 0.502 0.703 +/- 0.013

0.615 0.634 +/- 0.026 0.615 0.716 +/- 0.013

0.730 0.609 +/- 0.026 0.730 0.719 +/- 0.006

0.877 0.603 +/- 0.021 0.877 0.702 +/- 0.005

Erratum Table I pbar over p ratio, |y| < 0.5, 0.4 < p_T < 1.0 GeV/c

Centrality Fraction ratio

58-85% 0.79 +/- 0.010 (stat) +/- 0.07 (sys)

0-6% 0.71 +/- 0.002 (stat) +/- 0.05 (sys)

0-85% 0.73 +/- 0.003 (stat) +/- 0.05 (sys)

Fig 3. pbar over p ratios from central heavy-ion collisions
STAR data is for |y| < 0.5, 0.4 < p_T < 1.0 GeV/c, 0-6% most central collisions.

Original publication Erratum publication

sqrt(s_nn) ratio sqrt(s_nn) ratio

5.5 0.00020 +/- 0.00002 5.5 0.00020 +/- 0.00002

17.4 0.070 +/- 0.006 17.4 0.070 +/- 0.006

130.0 0.603 +/- 0.047 130.0 0.71 +/- 0.002(stat) +/- 0.05(sys)

Fig 3. pbar over p ratio from pp collisions

sqrt(s_nn) ratio

27.4 0.417 +/- 0.040
53.0 0.538 +/- 0.039
44.6 0.483 +/- 0.052
30.6 0.405 +/- 0.032
23.3 0.319 +/- 0.034