Baringer, Philip S.2014-10-082014-10-081985-08-05Baringer, Philip S. et al. (1985). "Measurement of the Topological Branching Fractions of the τ Lepton." Physical Review Letters, 1985(55):570. http://dx.doi.org/10.1103/PhysRevLett.55.5700031-9007https://hdl.handle.net/1808/15217This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.55.570We report new and precise measurements of the decay branching fractions of the τ lepton to one and three charged particles. The data, corresponding to an integrated luminosity of 176 pb(−1), were collected by the high resolution spectrometer HRS at the e(+)e(−) storage ring PEP at SLAC operated at s√=29 GeV. The fractions of τ decays into one and three charged particles are 0.869±0.002±0.003 and 0.130±0.002±0.003, respectively.Article10.1103/PhysRevLett.55.570openAccess