Measurements of tau decay modes and a precise determination of the mass |
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Authors: | R Brandelik W Braunschweig H-U Martyn HG Sander D Schmitz W Sturm W Wallraff D Cords R Felst R Fries E Gadermann H Hultschig P Joos W Koch U Kötz H Krehbiel D Kreinick S Yamada |
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Institution: | I. Physikalisches Institut der RWTH Aachen, Germany;Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany |
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Abstract: | The cross sections for e+e? → e+(μ+ + non showering track + any photons have been measured for cm energies between 3.1 GeV and 5.2 GeV. We observe τ-pair production below the thresholdfor charm production and determine the τ mass to be 1.807 ± 0.020 GeV from a fit to the energy dependence of the cross section. The ration of the leptonic branching ratios Bμ/Be = 0.92 ± 0.32 is consistent with eμ-universality. The following branching ratios are determined for a V-A coupling: . B(τ → ντ + charged hadron + any photons) = 0.29 ± 0.11, B(τ → ντ + three or more charged hadrons + any photons) = 0.35 ± 0.11. |
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Keywords: | DASP Collaboration |
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