Photon and Light Meson Production in Hadronic Z^0 Decays

Abstract

The inclusive production rates and differential cross-sections of photons and mesons with a final state containing photons have been measured with the OPAL detector at LEP. The light mesons covered by the measurements are the π^0, η, ρ(770)+-, ω(782), η'(958) and a_0(980)+-. The particle multiplicities per hadronic Z^0 decay, extrapolated to the full energy range, are: <n_γ> = 20.97 +/- 0.02 +/- 1.15, <n_π^0> = 9.55 +/- 0.06 +/- 0.75, <n_η> = 0.97 +/- 0.03 +/- 0.11, <n_ρ^+-> = 2.40 +/- 0.06 +/- 0.43, <n_ω> = 1.04 +/- 0.04 +/- 0.14, <n_η> = 0.14 +/- 0.01 +/- 0.02, <n_a_0+-> = 0.27 +/- 0.04 +/- 0.10. where the first errors are statistical and the second systematic. In general, the results are in agreement with the predictions of the JETSET and HERWIG Monte Carlo models.

arXiv comment53 pages, LaTeX, 15 eps figures included, submitted to Eur. Phys. J. C

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