Measurement of Cabibbo Suppressed Decays of the $τ$ Lepton

Details Measurement of Cabibbo Suppressed Decays of the $τ$ Lepton Measurement of Cabibbo Suppressed Decays of the $τ$ Lepton

1994-03-22

arxiv.org/abs/hep-ph/9403329v1

Phys.Rev.Lett.73:1079-1083,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages uuencoded compressed postscript (process with uudecode then gunzip). hardcopies with figures can be obtained by sendi

Scientific paper

10.1103/PhysRevLett.73.1079

Branching ratios for the dominant Cabibbo-suppressed decays of the $\tau$ lepton have been measured by CLEO~II in $e^+ e^-$ annihilation at CESR ($\sqrt{s} \sim 10.6$~GeV) using kaons with momenta below $0.7\ \rm GeV/c$. The inclusive branching ratio into one charged kaon is $(1.60 \pm 0.12 \pm 0.19)\%$. For the exclusive decays, $B(\tau \to K^-) = (0.66 \pm 0.07 \pm 0.09)\%$, $B(\tau \to K^- \pi^0) = (0.51 \pm 0.10 \pm 0.07)\%$, and, based on three events, $B(\tau \to K^- \pi^0 \pi^0) < 0.3\%$ at the 90\% confidence level. These represent significant improvements over previous results. $B(\tau\to K^- \pi^0)$ is measured for the first time with exclusive $\pi^0$ reconstruction.

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