Midrapidity lambda and antilambda production in Au+Au collisions at sqrt(sNN) = 130 GeV
C. Adler et al., Phys. Rev. Lett.89, 092301 (2002).

Fig.2: Tranverse mass distributions for selected centrality bins.

Only statistical errors are listed. Combined systematic errors estimated to be 10%. Data measured for |y|<0.5.

Lambda Antilambda
Centrality pT mT - m &Lambda [GeV/c] dN/(2 π mT dmT dy) [c2/GeV2] dN/(2 π mT dmT dy) [c2/GeV2]
35-75% 0.5 0.107 0.487 +- 0.089 0.333 +- 0.063
0.7 0.201 0.316 +- 0.036 0.247 +- 0.029
0.9 0.318 0.210 +- 0.014 0.163 +- 0.011
1.1 0.451 0.1347 +- 0.0061 0.1070 +- 0.0053
1.3 0.597 0.0861 +- 0.0047 0.0705 +- 0.0041
1.5 0.754 0.0519 +- 0.0037 0.0418 +- 0.0032
1.7 0.918 0.0286 +- 0.0026 0.0220 +- 0.0021
1.9 1.09 0.0154 +- 0.0015 0.0125 +- 0.0013
2.1 1.26 0.0094 +- 0.0013 0.0064 +- 0.0009
2.3 1.44 0.00431 +- 0.00068 0.00483 +- 0.00074
20-35% 0.5 0.107 1.49 +- 0.27 1.30 +- 0.24
0.7 0.201 0.97 +- 0.11 0.77 +- 0.08
0.9 0.318 0.734 +- 0.047 0.565 +- 0.038
1.1 0.451 0.513+-0.022 0.402+-0.019
1.3 0.597 0.359+-0.018 0.273+-0.015
1.5 0.754 0.226+-0.016 0.152+-0.011
1.7 0.918 0.142+-0.012 0.103+-0.009
1.9 1.09 0.0794+-0.0073 0.0606+-0.0059
2.1 1.26 0.0435+-0.0054 0.0327+-0.0042
2.3 1.44 0.0272+-0.0036 0.0184+-0.0026
10-20% 0.5 0.107 2.24 +- 0.39 1.57 +- 0.28
0.7 0.201 1.67 +- 0.18 1.27 +- 0.14
0.9 0.318 1.278 +- 0.076 0.932 +- 0.058
1.1 0.451 0.900 +- 0.032 0.631 +- 0.025
1.3 0.597 0.574 +- 0.026 0.480 +- 0.023
1.5 0.754 0.411 +- 0.026 0.290 +- 0.019
1.7 0.918 0.248 +- 0.020 0.191 +- 0.016
1.9 1.09 0.160 +- 0.014 0.113 +- 0.010
2.1 1.26 0.094 +- 0.011 0.0679 +- 0.0080
2.3 1.44 0.0528 +- 0.0064 0.0413 +- 0.0051
5-10% 0.5 0.107 3.07 +- 0.56 1.67 +- 0.31
0.7 0.201 1.93 +- 0.21 1.38 +- 0.15
0.9 0.318 1.59 +- 0.10 1.133 +- 0.073
1.1 0.451 1.146+-0.047 0.859+-0.037
1.3 0.597 0.792+-0.039 0.654+-0.034
1.5 0.754 0.536+-0.036 0.376+-0.026
1.7 0.918 0.333+-0.028 0.259+-0.022
1.9 1.09 0.199+-0.018 0.146+-0.013
2.1 1.26 0.109+-0.013 0.085+-0.011
2.3 1.44 0.0690+-0.0088 0.0517+-0.0068
0-5% 0.5 0.107 3.73 +- 0.65 2.19 +- 0.39
0.7 0.201 2.53 +- 0.27 1.79 +- 0.20
0.9 0.318 1.99 +- 0.12 1.395 +- 0.085
1.1 0.451 1.567 +- 0.057 1.097 +- 0.042
1.3 0.597 1.019 +- 0.047 0.748 +- 0.036
1.5 0.754 0.661 +- 0.042 0.488 +- 0.032
1.7 0.918 0.428 +- 0.034 0.311 +- 0.026
1.9 1.09 0.249 +- 0.021 0.196 +- 0.017
2.1 1.26 0.133 +- 0.015 0.109 +- 0.013
2.3 1.44 0.083 +- 0.010 0.0672 +- 0.0083

Fig.3: Tranverse momentum distributions in 5% most central collisions for selected particles.

Only statistical errors are listed. Combined systematic errors on hyperons estimated to be 10%. Correlated systematic errors for negative hadrons estimated to be 6%. Systematic errors on antiprotons are 8% point-to-point and 10% in the overall normalization. Antilambdas measured for |y|<0.5, antiprotons for |y|<0.1, negative hadrons for |η|<0.1.

Particle pT dN/(2 π pT dpT dy) [c2/GeV2]
Antilambda 0.5 2.19+-0.39
0.7 1.79+-0.20
0.9 1.395+-0.085
1.1 1.097+-0.042
1.3 0.748+-0.036
1.5 0.488+-0.032
1.7 0.311+-0.026
1.9 0.196+-0.017
2.1 0.109+-0.013
2.3 0.0672+-0.00083
h- pT dN/(2 π pT dpT dη) [c2/GeV2]
0.15 354+-15
0.25 275.2+-5.9
0.35 177.8+-4.1
0.45 116.5+-2.2
0.55 76.2+-1.2
0.65 48.43+-0.95
0.75 32.58+-0.64
0.85 22.20+-0.73
0.95 15.54+-0.32
1.05 10.88+-0.30
1.15 7.47+-0.24
1.25 5.44+-0.18
1.35 3.79+-0.16
1.45 2.64+-0.15
1.55 1.87+-0.12
1.65 1.38+-0.07
1.75 0.99+-0.07
1.85 0.71+-0.06
1.95 0.54+-0.05
Antiproton pT dN/(2 π pT dpT dy) [c2/GeV2]
0.275 5.03 +- 0.14
0.325 4.92 +- 0.13
0.375 4.58 +- 0.11
0.425 4.32 +- 0.10
0.475 4.24 +- 0.09
0.525 4.14 +- 0.09
0.575 3.99 +- 0.08
0.625 3.797 +- 0.073
0.675 3.505 +- 0.069
0.725 3.310 +- 0.065
0.775 3.213 +- 0.065
0.825 2.926 +- 0.068
0.875 2.874 +- 0.071
0.925 2.844 +- 0.094

Fig.4: Lambda and antilambda rapidity density as a function of negative hadron multiplicity at midrapidity.

Only statistical errors are listed. Systematic errors on hyperon yields 10%, on negative hadron yields 6%. Lambda and antilambdas measured for |y|<0.5, negative hadrons for |η|<0.1. Dashed lines correspond to Lambda = 0.054 h-, Antilambda = 0.040 h-.
Method h- dN/dη Lambda dN/dy Antilambda dN/dy
V0 296.6 17.0 +- 0.4 12.0 +- 0.3
243.4 13.0 +- 0.3 9.6 +- 0.3
186.7 10.1 +- 0.2 7.4 +- 0.2
109.6 5.9 +- 0.2 4.6 +- 0.1
33.3 1.61 +- 0.05 1.26 +- 0.04
Event Mixing 80.6 4.38+-0.15 3.11+-0.13

Table.1: Lambda and antilambda fit parameters from Boltzmann and exponential fits of the mT spectra for lambda and antilambda |y|<0.5.

. Only statistical errors are listed. Systematic errors on dN/dy and T are estimated to be 10%.
Centrality 0-5% 5-10% 10-20% 20-35% 35-75%
dN/dy (Boltzmann) Lambda 17.0+-0.4 13.0+-0.3 10.1+-0.2 5.9+-0.2 1.61+-0.05
Antilambda 12.0+-0.3 9.6+-0.3 7.4+-0.2 4.6+-0.1 1.26+-0.04
TB (Boltzmann) [MeV] Lambda 298+-5 304+-6 303+-6 289+-6 254+-5
Antilambda 312+-6 310+-6 305+-6 280+-6 258+-5
dN/dy (Exponential) Lambda 17.4+-0.4 13.3+-0.3 10.4+-0.2 6.1+-0.2 1.66+-0.05
Antilambda 12.3+-0.3 9.8+-0.3 7.6+-0.2 4.7+-0.1 1.30+-0.04
TE (Exponential) [MeV] Lambda 355+-8 364+-9 362+-8 343+-8 295+-7
Antilambda 374+-9 373+-8 366+-8 331+-8 301+-7