Arroyo Ureña, Marco AntonioHernández Tomé, G.López Castro, G.Roig Garcés, PabloRosell Escribá, IgnasiUCH. Departamento de Matemáticas, Física y Ciencias TecnológicasProducción Científica UCH 20222023-06-092023-06-092022-02-21Arroyo-Ureña, M.A., Hernández-Tomé, G., López-Castro, G., Roig, P. & Rosell, I. (2022). One-loop determination of τ → π(K)ντ [γ] branching ratios and new physics tests. Journal of High Energy Physics, vol. 2022, i. 2, art. 173 (21 feb.). DOI: https://doi.org/10.1007/JHEP02(2022)1731126-67081029-8479 (Electrónico)http://hdl.handle.net/10637/14416Este artículo se encuentra disponible en la siguiente URL: https://link.springer.com/article/10.1007/JHEP02(2022)173We calculate the ratios R /P 􀀀 ( ! P [ ]) /􀀀 (P ! μ μ[ ]) (P = ,K) at one loop following a large-NC expansion where Chiral Perturbation Theory is enlarged by including the lightest resonances and respecting the short-distance behavior dictated by QCD. We find R / = (0.18±0.57)% and R /K = (0.97±0.58)%, where the uncertainties are induced fundamentally by the counterterms. We test the lepton universality, obtaining |g /gμ| = 0.9964±0.0038 and |g /gμ|K = 0.9857±0.0078, and analyze the CKM unitarity, getting results at 2.1 and 1.5 from unitarity via |Vus/Vud| and |Vus|, respectively. We also update the search for non-standard interactions in decays. As a by-product, we report the theoretical radiative corrections to the ! P [ ] decay rates: = −(0.24 ± 0.56)% and K = −(0.15 ± 0.57)%.application/pdfenopen accessField Theory (Physics)Particles (Nuclear physics)Campos, Teoría clásica de.Lagrange, Funciones de.Lagrangian functions.Partículas (Física nuclear)Artículohttps://doi.org/10.1007/JHEP02(2022)173https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es