CP violation in semileptonic tau lepton decays

Details CP violation in semileptonic tau lepton decays CP violation in semileptonic tau lepton decays

2005-03-09

arxiv.org/abs/hep-ph/0503090v2

Phys.Rev. D72 (2005) 033009

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures, version published in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.72.033009

The leading order contribution to the direct CP asymmetry in tau^{+/-} -> K^{+/-} pi^0 nu_{tau} decay rates is evaluated within the Standard Model. The weak phase required for CP violation is introduced through an interesting mechanism involving second order weak interactions, which is also responsible for tiny violations of the Delta S= Delta Q rule in K_{l3} decays. The calculated CP asymmetry turns out to be of order 10^{-12}, leaving a large window for studying effects of non-standard sources of CP violation in this observable.

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