Sigma+, Sigma0 and Sigma- hyperon production in hadronic Z0 decays

octet Σ baryons in hadronic Z0 decays have been measured using the OPAL detector at LEP. The inclusive production rates per hadronic Z0 decay of the three isospin states (including the respective antiparticle) have been separately measured for the first time:

άtrix {n_{Sigma^{+}}=0.099pm 0.008pm 0.013ŗ n_{Sigma^{0}}=0.071pm 0.012pm 0.013ŗ n_{Sigma^{-}}=0.083pm 0.006pm 0.009ŗ}

where the first error is statistical and the second is systematic. Differential cross-sections are also presented for the Σ+ and Σ− and compared with JETSET and HERWIG predictions. Assuming full isospin symmetry, the average inclusive rate is:

{1⩈er 3}[n_{Sigma^{+}+Sigma^{0}+Sigma^{-}}]=0.084pm 0.005 ({⤪ stat.}) pm 0.008 ({⤪ syst.})

.

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: hadronic decay
Sigma: production
Sigma+: hadronic decay
Sigma-: hadronic decay
Sigma0: radiative decay
yield: (Sigma+ Sigma- Sigma0)
differential cross section: energy dependence

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