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A MEASUREMENT OF THE TAU-LEPTONIC BRANCHING FRACTIONS

Abstract:
A sample of 25000 Z0 → τ+τ- events collected by the DELPHI experiment at LEP in 1991 and 1992 is used to measure the leptonic branching fractions of the τ lepton. The results are B(τ → eνν) = (17.51 ± 0.39)% and B(τ → μνν) = (17.02 ± 0.31) %. The ratio of the muon and electron couplings to the weak charged current is measured to be gμ ge = 1.000 ± 0.013, satisfying e-μ universality. The leptonic branching fraction corrected to the value for a massless lepton, assuming e-μ universality, is found to be B(τ → lνν) = (17.50 ± 0.25)%. © 1995.
Publication status:
Published

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Journal:
PHYSICS LETTERS B
Volume:
357
Issue:
4
Pages:
715-724
Publication date:
1995-09-14
DOI:
ISSN:
0370-2693
URN:
uuid:4990882e-6d64-403e-94fe-0672e25a00ce
Source identifiers:
2957
Local pid:
pubs:2957

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