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Phenomenology of an SU(2) × SU(2) × U(1) model with lepton-flavour non-universality
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نویسنده
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Boucenna Sofiane M. ,Celis Alejandro ,Fuentes-Martín Javier ,Vicente Avelino ,Virto Javier
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منبع
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journal of high energy physics - 2016 - دوره : 2016 - شماره : 12 - صفحه:1 -43
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چکیده
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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 → cℓν 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 → m μ + μ −)/γ(b → me + e −), with m = k * , ϕ, are found to be reduced with respect to the standard model expectation r m ≃ 1.
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کلیدواژه
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Beyond Standard Model ,Gauge Symmetry
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آدرس
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Laboratori Nazionali di Frascati, INFN, Italy, Ludwig-Maximilians-Universität München, Germany, Instituto de Física Corpuscular, Spain, Instituto de Física Corpuscular, Spain, University of Bern, Switzerland
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Authors
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