A new theoretical determination of Rτ /P (P = π, K)
DOI:
https://doi.org/10.31349/SuplRevMexFis.3.0308047Keywords:
Radiative decays, tau, pion, kaon, lepton universality, effective field theories, CKM unitarity, non-standard interactionsAbstract
We have determined Rτ/P ≡ Γ(τ → P ντ [γ])/Γ(P → µνµ[γ]) (P = π, K). Whereas P decays are calculated by using Chiral Perturbation Theory (ChPT), τ decays have been 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 have allowed us to test the lepton universality and the CKM unitarity and also to search for bounds on non-standard interactions. Our results, δRτ/π = (0.18±0.57)% and δRτ/K = (0.97±0.58)%, are consistent with the previous theoretical determinations, but with much more robust assumptions, yielding a reliable uncertainty.
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Copyright (c) 2022 Ignasi Rosell (Author)
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