Measurement of the τ lepton mass and an upper limit on the mass difference between τ+ and τ-

The mass of the τ lepton has been measured in the decay mode τ→3πντ using a pseudomass technique. The result obtained from 414fb-1 of data collected with the Belle detector is Mτ=[1776.61±0. 13(stat)±0.35(sys)]MeV/c2. The upper limit on the relative mass difference between positive and negative τ leptons is |Mτ+-Mτ-|/ Mτ<2.8×10-4 at 90% confidence level. © 2007 The American Physical Society.


Published in:
Physical Review Letters, 99, 1, 011801
Year:
2007
Other identifiers:
Scopus: 2-s2.0-34547290479
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 Record created 2010-11-05, last modified 2018-05-17


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