2005/03/31 by D. Delepine, D. Delépine, G. López Castro +3 · 2 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1103/physrevd.72.033009
published as Phys.Rev. D72 (2005) 033009 · 5 pages, 3 figures, version published in Phys.Rev.D
openalex publication_date 2005/08/09 · arxiv created 2005/08/16 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The leading order contribution to the direct CP asymmetry in \ensuremathτ^\ifmmode±\else\textpm\fi\ensuremath→K^\ifmmode±\else\textpm\fi\ensuremathπ0\ensuremathν_\ensuremathτ 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 \ensuremathΔS=\ensuremathΔQ rule in Kl3 decays. The calculated CP asymmetry turns out to be of order 10^\ensuremath-12, leaving a large window for studying effects of nonstandard sources of CP violation in this observable.