G. Alexander et al., SIGMA(-) HYPERON PRODUCTION IN HADRONIC Z(0)(), SIGMA(0) AND SIGMA(), Zeitschrift fur Physik. C, Particles and fields, 73(4), 1997, pp. 587-599
The production rates of the J(P) = 1/2(+) octet Sigma baryons in hadro
nic Z(0) decays have been measured using the OPAL detector at LEP. The
inclusive production rates per hadronic Z(0) decay of the three isosp
in states (including the respective antiparticle) have been separately
measured for the first time: n(Sigma+) = 0.099 +/- 0.008 +/- 0.013 n(
Sigma 0) = 0.071 +/- 0.012 +/- 0.013 n(Sigma-) = 0.083 +/- 0.006 +/- 0
.009, where the first error is statistical and the second is systemati
c. Differential cross-sections are also presented for the Sigma(+) and
Sigma(-) and compared with JETSET and HERWIG predictions. Assuming fu
ll isospin symmetry, the average inclusive rate is: 1/3[n(Sigma++Sigma
0+Sigma-)] = 0.084 +/- 0.005 (stat.) +/- 0.008 (syst.).