One meson radiative tau decays

Abstract

We have studied the one meson radiative tau decays: tau- -> nu(tau) pi-(K-) gamma, computing the structure dependent contributions within a Lagrangian approach based on the large-N(C) limit of QCD that ensures the proper low-energy limit dictated by chiral symmetry. Upon imposing the short-distance QCD constraints to the form-factors we are able to predict without any free parameter the structure dependent radiation and, therefore, the relevant observables for the decay tau- -> nu(tau) pi- gamma: the photon energy spectrum, the invariant mass spectrum of the meson-photon system and the integrated decay rate. We also discuss the remaining uncertainties in these observables for the tau- -> nu(tau) K- gamma decay. According to our results, the present facilities could detect these rare decays for the first time in the near future allowing for a stringent test of our predictions.

40 pages, 13 figures, 2 tables. Published version: discussion on the QCD short distance behavior added in Section VI and corresponding references included too; numerical results and conclusions not changed

References in corpus (17)

• Towards a consistent estimate of the chiral low-energy constants
• The Standard Model prediction for R_{e/mu}^{(pi,K)}
• The K^*_0(800) scalar resonance from Roy-Steiner representations of pi K scattering
• Scalar K pi form factor and light quark masses
• pi/K -> e nu branching ratios to O(e^2 p^4) in Chiral Perturbation Theory
• Form Factors in the radiative pion decay
• Spectral distribution for the decay tau -> nu_tau K pi
• What can be learned from the Belle spectrum for the decay tau- -> nu_tau K_S pi-
• Analyticity constraints on the strangeness changing vector current and applications to $\tau \to K\pi {\nu }_{\tau }$, $\tau \to K\pi \pi {\nu }_{\tau }$
• Hadronic charmless B decays B-> AP
• Study of tau- --> V P- nu(tau) in the framework of resonance chiral theory
• Tensor meson exchange at low energies
• Pi pi scattering lengths at O(p^6) revisited
• Tau Physics: Theory Overview
• Soft Photon Problem in Leptonic B-decays
• Hadronic decays of the tau lepton: Theoretical outlook
• A proposal for improving the hadronization of QCD currents in TAUOLA