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Measurement of cabibbo-suppressed decays of the tau lepton

Ammar, Raymond G.
Ball, S.
Baringer, Philip S.
Bean, Alice
Besson, David Zeke
Coppage, Don
Copty, N.
Davis, Robin E. P.
Hancock, N.
Kelly, M.
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Abstract
Branching ratios for the dominant Cabibbo-suppressed decays of the tau lepton have been measured by CLEO II in e+e- annihilation at the Cornell Electron Storage Ring (square-root s approximately 10.6 GeV) using kaons with momenta below 0.7 GeV/c. The inclusive branching ratio into one charged kaon is (1.60 +/- 0.12 +/- 0.19)%. For the exclusive decays, B(tau- --> K- nu(tau)) = (0.66 +/- 0.07 +/- 0.09)%, B(tau- --> K-pi0nu(tau) = (0.51 +/- 0.10 +/- 0.07)%, and, based on three events, B(tau- --> K-2pi0nu(tau) < 0.3% at the 90% confidence level. These represent significant improvements over previous results. B(tau- --> K- pi0nu(tau)) is measured for the first time with exclusive pi0 reconstruction.
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1994-08
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AMERICAN PHYSICAL SOC
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BATTLE, M, ERNST, J, et al. Measurement of cabibbo-suppressed decays of the tau lepton. PHYSICAL REVIEW LETTERS. August 1994. 73(8) : 1079-1083
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