Tau decays with neutral kaons

The branching ratio of the tau lepton to a neutral K meson is measured from a sample of approximately 200,000 tau decays recorded by the OPAL detector at centre-of-mass energies near the Z0 resonance. The measurement is based on two samples which identify one-prong tau decays with KL and KS mesons. The combined branching ratios are measured to be B(tau- -->pi- K0bar nutau) = (9.33+-0.68+-0.49)x10^-3 B(tau- -->pi- K0bar [>=1pi0] nutau) = (3.24+-0.74+-0.66)x10^-3 B(tau- -->K- K0bar [>=0pi0] nutau) = (3.30+-0.55+-0.39)x10^-3 where the first error is statistical and the second systematic.

Note:

21 pages, 6 figures, submitted to Eur. Phys. J. C Journal-ref: CERN-EP/99-154

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: leptonic decay
tau: pair production
tau-: semileptonic decay
K0
tau-: branching ratio
decay constant: ratio
OPAL

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