Abstract
Instanton solutions of non-abelian Yang-Mills theories generate an effective action that may induce lepton and baryon number violations, namely ΔB = ΔL = n f , being n f the number of families coupled to the gauge group. In this article we study instanton mediated processes in a SU(2) ℓ ⊗SU(2) h ⊗U(1) extension of the Standard Model that breaks universality by singularizing the third family. In the construction of the instanton Green functions we account systematically for the inter-family mixing. This allows us to use the experimental bounds on proton decay in order to constrain the gauge coupling of SU(2) h . Tau lepton non-leptonic and radiative decays with ΔB = ΔL = 1 are also analysed.
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Fuentes-Martín, J., Portolés, J. & Ruiz-Femenía, P. Instanton-mediated baryon number violation in non-universal gauge extended models. J. High Energ. Phys. 2015, 134 (2015). https://doi.org/10.1007/JHEP01(2015)134
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DOI: https://doi.org/10.1007/JHEP01(2015)134