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In this talk we study the sensitivity of exclusive hadronic tau decays to non-standard interactions using the low-energy limit of the Standard Model Effective Field Theory. Employing Lattice input and dispersive form factors, along with experimental data, we analyze both one and two meson decays to set bounds on the new physics effective couplings. Our results complement the traditional low-energy probes, such as nuclear β or Kℓ3 decays, and can be improved with new data, e.g. from Belle-II.more » « less
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Achasov, M.N. ; Ignatov, F.V. ; Krokovny, P.P. (Ed.)We review the state-of-the-art theoretical analyses of tau decays into a pair of mesons and a neutrino. The participant vector and scalar form factors, f + ( s ) and f 0 ( s ), are described in the frame of Chiral Perturbation Theory with resonances supplemented by dispersion relations, and the physical parameters of the intermediate resonances produced in the decay are extracted through the pole position of f +,0 ( s ) in the complex plane. As a side result, we also determine the low-energy observables associated to the form factors. We hope our study to be of interest for present and future experimental analyses of these decays.more » « less
