New CLEO Results on Tau Physics
نویسنده
چکیده
New, preliminary tau physics results are reported from tau-pair data acquired with the CLEO 11 detector operating at the Cornell Electron Storage Ring. The tau m~s is measured as m, = 1777.6 + 0.9 + 1.5 MeV/cz by exploiting the kinematics of events in which both taus decay hadronicdly. The electronic branching fraction is determined to be B,=O. 1742+0.0015+0.0023 by counting di-electron tau-pair decays and normalizing to luminosity. Using a similar double-tag method, we me~ure the branching fraction for a single charged hadron h+ (rr* or K*) accompanied by exactly one rr” ~ B(h*~”v)= 0.2483+0.0015+0.0053. Branching fractions to h* accompanied by two, three, or four rr”’s, normalized to B(h*~”v), are also presented M 0.348 +0.006 +0.016, 0.042 +0.003 +0.004, and 0.006 +0.002 +0.002, respectively.
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