CP violation in semileptonic tau lepton decays

Abstract

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.

arXiv comment5 pages, 3 figures, version published in Phys.Rev.D

References in corpus (6)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• CP Violation in Semileptonic $\tau$ Decays with Unpolarized Beams
• Search for CP Violation in τ-> Kπν_τDecays
• Tensor interactions and $\tau$ decays
• Search for CP Violation in $\tau \to \pi {\pi }^0{\nu }_{\tau }$ Decay
• Nonleptonic charmless 2-body B decays in the perturbative QCD approach

Cited by in corpus (11)

• New Physics at a Super Flavor Factory
• CP asymmetry in $\tau \to K_S\pi {\nu }_{\tau }$ decays within the Standard Model and beyond
• Can the observed CP asymmetry in tau --> K pi nu_tau be due to Non-Standard Tensor interactions?
• Supersymmetry and CP violation in |ΔS|=1 tau-decays
• $CP$ asymmetry in the angular distribution of $\tau \to K_S\pi {\nu }_{\tau }$ decays
• Is there a paradox in CP asymmetries of tau to K_{L,S} pi nu decays?
• Direct CP violation in ${\tau }^{\pm }\to K^{\pm }{\rho }^0(\omega ){\nu }_{\tau }\to K^{\pm }{\pi }^{+}{\pi }^{-}{\nu }_{\tau }$
• SUSY R parity violation and CP asymmetry in semi-leptonic tau-decays
• Violation of CP and T in semileptonic decays due to scalar interactions
• CP violation in two-meson Tau decays induced by heavy new physics
• CP Asymmetry in $\tau \to K\pi {\nu }_{\tau }$ within Non-Minimal $SU(5)$