26-31 July 2021
Mexico City
Mexico/General timezone
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Contribution Leading parallel

Mexico City -
Hadron Decays, Production and Interactions

A new theoretical determination of R_(tau/P) (P=pi,K)


  • Ignasi ROSELL

Primary authors



We determine $R_{\tau/P}\equiv \Gamma(\tau \to P \nu_\tau [\gamma]) / \Gamma(P \to\mu \nu_\mu[\gamma])$ ($P=\pi, K$). Whereas $P$ decays are calculated by using Chiral Perturbation Theory (ChPT), $\tau$ decays are studied with an effective approach where ChPT is enlarged by including the lightest resonances and following the high-energy behavior dictated by QCD. These ratios allow us to test the lepton universality and the unitarity and also to search for bounds on non-standard interactions.