A Study of one prong tau decays with a charged kaon

From an analysis of the ionisation energy loss of charged particles selected from 110326 e+e- -> tau+tau- candidates recorded by the OPAL detector at e+e- centre-of-mass energies near the Z0 resonance, we determine the one-prong tau decay branching ratios: Br(tau- -> nu_tau K- >=0h0) = 1.528 +- 0.039 +- 0.040 % Br(tau- -> nu_tau K-) = 0.658 +- 0.024 +- 0.029 % where the h0 notation refers to a pi0, an eta, a K^0_S, or a K^0_L, and where the first uncertainty is statistical and the second is systematic.

Note:

30 pages, 5 figures, submitted to Eur. Phys. J. C Report-no: CERN-EP-2000-091

electron positron: colliding beams
electron positron: annihilation
tau: pair production
tau: semileptonic decay
tau: branching ratio
charged particle: energy loss
OPAL
experimental results
CERN LEP Stor
tau- --> K- neutrino/tau

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