2014/11/30 by Javier Fuentes-Martín, J. Fuentes-Martin, J. Portolés +3
Mathematics · Physics and Astronomy · #Abelian group #Baryon #Baryon number #Combinatorics #Fermion #Gauge boson #Gauge group #Gauge theory #High-Energy Particle Collisions Research #Instanton #Lepton #Lepton number #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Proton decay #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Universality (dynamical systems) #hep-ex #hep-ph
paper · pdf · doi:10.1007/jhep01(2015)134
published as JHEP 1501 (2015) 134 · 33 pages, 3 figures. Further explanations about the instanton solutions for the G(221) model added in a new appendix, conclusions unchanged. Version published in JHEP
openalex publication_date 2015/01/01 · arxiv created 2015/01/30 · arxiv updated 2015/02/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.