Symmetry breaking in τ decay

Bing An Li, Keh Fei Liu

Research output: Contribution to journalArticlepeer-review


In view of the recent attempts to detect the G-parity violating decay τ→πηvτ which may have bearing on the presence of the second class current, we discuss the isospin symmetry breaking effects in the processes of τ→δv, Bv, and ηπv from a dynamical point of view. It is shown that all the symmetry breaking effects are proportional to the u-d quark mass difference. Depending on whether the current or the constituent quark masses are used, the decay τ→πηvτ via δ is either of the same order or three orders of magnitude smaller than the upper limit set by the latest experiments. This is in agreement with the other theoretical estimates.

Original languageEnglish
Pages (from-to)559-563
Number of pages5
JournalZeitschrift für Physik C Particles and Fields
Issue number4
StatePublished - Dec 1988

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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