Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2002-11-22
eConf C0209101:TU06,2002; Nucl.Phys.Proc.Suppl.123:47-65,2003
Physics
High Energy Physics
High Energy Physics - Experiment
Invited Talk at Tau02 International Workshop, Sept. 10-13 2002, Santa Cruz, California, 19 pages, 13 figures
Scientific paper
10.1016/S0920-5632(03)80306-7
Full LEP-I data collected by the ALEPH detector during 1991-1995 running are analyzed in order to measure the $\tau$ decay branching fractions. The analysis follows the global method used in the published study based on 1991-1993 data, with several improvements, especially concerning the treatment of photons and $\pi^0$'s. Extensive systematic studies are performed, in order to match the large statistics of the data sample corresponding to 327148 measured and identified $\tau$ decays. Preliminary values for the branching fractions are obtained for the 2 leptonic channels and 11 hadronic channels defined by their respective numbers of charged particles and $\pi^0$'s. Using previously published ALEPH results on final states with charged and neutral kaons, corrections are applied so that branching ratios for exclusive final states without kaons are derived. Some physics implications of the results are given, in particular concerning universality in the leptonic charged weak current, isospin invariance in $a_1$ decays, and the separation of vector and axial-vector components of the total hadronic rate.
Davier Michel
Yuan Changzheng
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