The Z, Z' → γγγ decays in the minimal 331 model

15th Mexican School of Particles and Fields

Montaño, J.^1 ; Pérez, M.A.^1 ; Ramírez-Zavaleta, F.^2 ; Toscano, J.J.^3

Departamento de Física, CINVESTAV, Apartado Postal 14-740, México, D. F., 07000, Mexico^1

Facultad de Ciencias Físico Matemáticas, Universidad Michoacana de San Nicolás de Hidalgo, Avenida Francisco J. Mújica S/N, Michoacán, 58060, Morelia, Mexico^2

Facultad de Ciencias Físico Matemáticas, Benemérita Universidad Autónoma de Puebla, Apartado Postal 1152, Puebla, Puebla, Mexico^3

关键词: Bose symmetry;    Branching ratio;    Complete calculation;    Gauge bosons;    Heavy particles;    Loop level;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/468/1/012007/pdf
DOI  :  10.1088/1742-6596/468/1/012007

来源: IOP

【 摘 要 】

A complete calculation at one-loop level for the Z, Z' → γγγ decays is presented in the context of the minimal 331 model, which predicts the existence of a new Z' neutral gauge boson, Y++, Y+charged gauge bosons, new exotic quarks and charged scalars. Bose symmetry is exploited to write a compact and manifest SUC[(3)-invariant vertex function for the γγγV0coupling. Previous results on the Z → γγγ are reproduced (Br(Z → γγγ) ∼ 10-10). It is found that this decay is insensitive to the effects of new heavy particles. This contrasts with the Z' → γγγ decay where the associated branching ratio is of the order of 10-6.