CP violation in tau -> K pi pi nu_tau

Abstract

We consider CP-violating effects in tau->K pi pi nu_tau, assuming that a charged Higgs boson provides a new amplitude that can interfere with the usual Standard Model amplitude. We consider four CP-odd observables -- the regular rate asymmetry, two modified rate asymmetries and a triple-product asymmetry. The regular rate asymmetry is expected to be small because it requires the interference of the new physics amplitude with the standard model amplitude containing the hadronic scalar form factor. The other CP asymmetries may be more promising in terms of their new physics reach. Numerical estimates indicate that the maximum obtainable values for the modified and triple-product asymmetries are on the order of a percent.

23 pages, 3 figures

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Cited by in corpus (7)

• Search for CP violation in tau -> K^0_S pi nu_tau decays at Belle
• Measurement of the branching fractions and the invariant mass distributions for tau^- -> h^-h^+h^-nu_tau decays
• CP violation in $B\to D\tau {\nu }_{\tau }$ using multi-pion tau decays
• Nonstandard interactions of tau neutrino via charged Higgs and $W^{\prime }$ contribution
• Direct CP violation in ${\tau }^{\pm }\to K^{\pm }{\rho }^0(\omega ){\nu }_{\tau }\to K^{\pm }{\pi }^{+}{\pi }^{-}{\nu }_{\tau }$
• Violation of CP and T in semileptonic decays due to scalar interactions
• Probing sensitivity to charged scalars through partial differential widths: $\tau \to K\pi \pi {\nu }_{\tau }$ decays