• Letter
  • Open Access

Radiative corrections to τπ(K)ντ[γ]: A reliable new physics test

M. A. Arroyo-Ureña, G. Hernández-Tomé, G. López-Castro, P. Roig, and I. Rosell
Phys. Rev. D 104, L091502 – Published 29 November 2021

Abstract

The ratios Rτ/PΓ(τPντ[γ])/Γ(Pμνμ[γ]) (P=π, K) provide sensitive tests of lepton universality |gτ/gμ|=1 and are a useful tool for new physics searches. The radiative corrections to Rτ/P are computed following a large-NC expansion to deal with hadronic effects: Chiral Perturbation Theory is enlarged by including the lightest multiplets of spin-one heavy states such that the relevant Green functions are well behaved at high energies. We find δRτ/π=(0.18±0.57)% and δRτ/K=(0.97±0.58)%, which imply |gτ/gμ|π=0.9964±0.0038 and |gτ/gμ|K=0.9857±0.0078, compatible with and at 1.8σ of lepton universality, respectively. We test unitarity and bind nonstandard effective interactions with the τPντ[γ] decays.

  • Figure
  • Received 20 July 2021
  • Revised 1 October 2021
  • Accepted 11 November 2021

DOI:https://doi.org/10.1103/PhysRevD.104.L091502

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

M. A. Arroyo-Ureña1, G. Hernández-Tomé1, G. López-Castro1, P. Roig1, and I. Rosell2

  • 1Departamento de Física, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Apartado Postal 14-740, 07000 Ciudad de México, Mexico
  • 2Departamento de Matemáticas, Física y Ciencias Tecnológicas, Universidad Cardenal Herrera-CEU, CEU Universities, 46115 Alfara del Patriarca, València, Spain

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Vol. 104, Iss. 9 — 1 November 2021

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