Search for violation of CP invariance in τ± decay

W. T. Ford, P. A. Piroué, R. S. Remmel, A. J.S. Smith, P. A. Souder

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


We report a comparison of the Dalitz-plot distributions of 1.6 million τ+ decays (K+→π+π+π-) and an equal number of τ- decays. No significant asymmetry has been found in any region of the plot. In terms of the difference in the slope parameters a+ and a- for the odd-pion c.m.-energy spectra, the asymmetry is Δ=(a+-a-)(a++a-)=-0.0070±0.0053. We also present a preliminary result for the slope parameter itself: a=0.283±0.005. New measurements of the τ± decay rates and their difference confirm previous results.

Original languageEnglish (US)
Pages (from-to)1370-1373
Number of pages4
JournalPhysical Review Letters
Issue number19
StatePublished - 1970
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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