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Measurement of the Topological Branching Fractions of the τ Lepton

1985; American Physical Society; Volume: 55; Issue: 6 Linguagem: Inglês

10.1103/physrevlett.55.570

1092-0145

C. Akerlof, G. Baranko, P. Baringer, I. Beltrami, D. Blockus, G. Bonvicini, B. Brabson, Ben Bylsma, J. Chapman, B. Cork, R. DeBonte, M. Derrick, D. Errede, E. Fernández, G. E. Forden, Rainer J. Fries, K. K. Gan, S. W. Gray, N. Harnew, L. Hyman, C. K. Jung, L. Keller, P. Kesten, D. Koltick, P. Kooijman, S.A.L.M. Kooijman, F.J. Loeffler, J. S. Loos, E. H. Low, R. L. McIlwain, D. I. Meyer, D. H. Miller, B. Musgrave, H. A. Neal, C. R. Ng, D. Nitz, H. Ogren, P. P. Ong, L. E. Price, L. K. Rangan, D. Rubin, D. R. Rust, J. Schlereth, A. A. Seidl, E. I. Shibata, K. Sugano, R. P. Thun, T. Trinko, M. Valdata-Nappi, J. Va’vra, J. M. Weiss, M. Willutzky, R. J. Wilson, D. Wood,

Black Holes and Theoretical Physics

We report new and precise measurements of the decay branching fractions of the $\ensuremath{\tau}$ lepton to one and three charged particles. The data, corresponding to an integrated luminosity of 176 ${\mathrm{pb}}^{\ensuremath{-}1}$, were collected by the high resolution spectrometer HRS at the ${e}^{+}{e}^{\ensuremath{-}}$ storage ring PEP at SLAC operated at $\sqrt{s}=29$ GeV. The fractions of $\ensuremath{\tau}$ decays into one and three charged particles are 0.869\ifmmode\pm\else\textpm\fi{}0.002\ifmmode\pm\else\textpm\fi{}0.003 and 0.130\ifmmode\pm\else\textpm\fi{}0.002\ifmmode\pm\else\textpm\fi{}0.003, respectively.