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

被引：17

作者：

Arroyo-Urena, M. A. ^{[1
]}

Hernandez-Tome, G. ^{[1
]}

Lopez-Castro, G. ^{[1
]}

Roig, P. ^{[1
]}

Rosell, I ^{[2
]}

机构：

[1] Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Fis, Apartado Postal 14-740, Ciudad De Mexico 07000, Mexico

[2] Univ Cardenal Herrera CEU, CEU Univ, Dept Matemat Fis & Ciencias Tecnol, Valencia 46115, Spain

来源：

PHYSICAL REVIEW D | 2021年 / 104卷 / 09期

关键词：

LOW-ENERGY;

D O I：

10.1103/PhysRevD.104.L091502

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The ratios R-tau/P = Gamma (tau -> P-nu tau[gamma]/Gamma(P ->mu nu[gamma]) (P=pi, K) provide sensitive tests of lepton universality vertical bar g(tau)/g mu vertical bar= 1 and are a useful tool for new physics searches. The radiative corrections to Rt= 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 delta R-tau/pi = (0.18 +/- 0.57)% and delta R-tau/K - (0.97 +/- 0.58)%, which imply vertical bar g(tau)/g(mu)vertical bar(pi)= 0.9964 +/- 0.0038 and vertical bar g(tau)/g(mu)vertical bar(K) = 0.9857 +/- 0.0078, compatible with and at 1.8s of lepton universality, respectively. We test unitarity and bind nonstandard effective interactions with the tau -> P nu[gamma] decays.

引用

页数：6

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