Phenomenology of an SU(2) × SU(2) × U(1) model with lepton-flavour non-universality
Author(s)Boucenna, Sofiane M; Celis, Alejandro; Fuentes-Martín, Javier; Vicente, Avelino; Virto, Javier
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We investigate a gauge extension of the Standard Model in light of the observed hints of lepton universality violation in b → clv and b → sl+l − decays at BaBar, Belle and LHCb. The model consists of an extended gauge group SU(2)₁ × SU(2)₂ × U(1)Y which breaks spontaneously around the TeV scale to the electroweak gauge group. Fermion mixing effects with vector-like fermions give rise to potentially large new physics contributions in flavour transitions mediated by W′ and Z′ bosons. This model can ease tensions in B-physics data while satisfying stringent bounds from flavour physics, and electroweak precision data. Possible ways to test the proposed new physics scenario with upcoming experimental measurements are discussed. Among other predictions, the ratios R M = Γ( B → Mμ + μ − )/Γ( B → Me+e− ), with M = K ∗ ,φ, are found to be reduced with respect to the Standard Model expectation R M ~/= 1.
DepartmentMassachusetts Institute of Technology. Department of Physics
Journal of High Energy Physics
Springer Berlin Heidelberg
Boucenna, Sofiane M., Alejandro Celis, Javier Fuentes-Martín, Avelino Vicente and Javier Virto. "Phenomenology of an SU(2) × SU(2) × U(1) model with lepton-flavour non-universality." Journal of High Energy Physics, December 2016, 2016:59.
Final published version