Dispersive representation of the scalar and vector Kpi form factors for tau --> K pi nu_tau and K_{l3} decays

Abstract

Recently, the tau --> K pi nu_tau decay spectrum has been measured by the Belle and BaBar collaborations. In this work, we present an analysis of such decays introducing a dispersive parametrization for the vector and scalar Kpi form factors. This allows for precise tests of the Standard Model. For instance, the determination of f_+(0)|V_{us}| from these decays is discussed. A comparison and a combination of these results with the analyses of the K_{l3} decays is also considered.

6 pages, 1 figure. Talk given at 11th International Workshop on Tau Lepton Physics, Manchester, UK, 13-17 September 2010

References in corpus (10)

• An evaluation of |Vus| and precise tests of the Standard Model from world data on leptonic and semileptonic kaon decays
• Spectral distribution for the decay tau -> nu_tau K pi
• Dispersive representation and shape of the Kl3 form factors: robustness
• K pi vector form factor, dispersive constraints and tau -> nu_tau K pi decays
• Electromagnetic effects in Kl3 decays
• Analyticity constraints on the strangeness changing vector current and applications to $\tau \to K\pi {\nu }_{\tau }$, $\tau \to K\pi \pi {\nu }_{\tau }$
• K pi vector form factor constrained by tau ---> K pi nu_tau and K_l3 decays
• Matching Chiral Perturbation Theory and the Dispersive Representation of the Scalar Kpi Form Factor
• The Kl3 scalar form factors in the standard model
• Electromagnetic corrections in hadronic tau decay

Cited by in corpus (16)

• Lepton flavor violation in the Higgs sector and the role of hadronic tau-lepton decays
• A no-go theorem for non-standard explanations of the $\tau \to K_S\pi {\nu }_{\tau }$ CP asymmetry
• Chiral Dynamics and S-wave Contributions in Semileptonic B decays
• Predictions on the second-class current decays ${\tau }^{-}\to {\pi }^{-}{\eta }^{(\prime )}{\nu }_{\tau }$
• Dispersive $\pi K\to \pi K$ and $\pi \pi \to K\bar{K}$ amplitudes from scattering data, threshold parameters and the lightest strange resonance $\kappa$ or $K_0^{\ast }(700)$
• Predicting the tau strange branching ratios and implications for V_{us}
• Kaon semileptonic vector form factor and determination of |V_{us}| using staggered fermions
• CP asymmetry in $\tau \to K_S\pi {\nu }_{\tau }$ decays within the Standard Model and beyond
• A New Theory Framework for the Electroweak Radiative Corrections in $K_{l3}$ Decays
• First determination of $f_{+}(0)|V_{us}|$ from a combined analysis of $\tau \to K\pi {\nu }_{\tau }$ decay and $\pi K$ scattering with constraints from $K_{\ell 3}$ decays
• On the scalar $\pi K$ form factor beyond the elastic region
• $CP$ asymmetry in the angular distributions of $\tau \to K_S\pi {\nu }_{\tau }$ decays -- II: general effective field theory analysis
• Two-Meson Form Factors in Unitarized Chiral Perturbation Theory
• Feasibility study of $CP$ Violation in ${\tau }^{-}\to K_S{\pi }^{-}{\nu }_{\tau }$ decays at Super Tau Charm Facility
• Model Independent Electromagnetic corrections in hadronic $\tau$ decays
• On the scalar $\pi K$ form factor beyond the elastic region