Non-abelian gauge extensions for B-decay anomalies

By Sofiane Boucenna, Alejandro Celis, J. Fuentes-Martín, Avelino Vicente, J. Virto. 2016

233 citations recorded by the source corpus.

Abstract We study the generic features of minimal gauge extensions of the Standard Model in view of recent hints of lepton-flavor non-universality in semi-leptonic b → s l + l − and b → c l ν decays. We classify the possible models according to the symmetry-breaking pattern and the source of flavor non-universality. We find that in viable models the S U ( 2 ) L factor is embedded non-trivially in the extended gauge group, and that gauge couplings should be universal, hinting to the presence of new degrees of freedom sourcing non-universality. Finally, we provide an explicit model that can explain the B -decay anomalies in a coherent way and confront it with the relevant phenomenological constraints.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/7d8135904f49f3806ece6b0600bfec12f374048b

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In Nuclear and High Energy Physics

Citations in the corpus

Assessing lepton-flavour non-universality from B → K*ℓℓ angular analyses (2016, background): “Naively one expects these effects to be of order α log(m(2)e/m 2 μ) ∼ 8% [38].”
Review of lepton universality tests in B decays (2018, background): “This pattern can be achieved in Z ′ models with loop-induced couplings [209] or in Z ′ models with heavy vector-like fermions [177,178].”
Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data (2017, background): “We include all the observables considered in the reference fit of Ref.”
Phenomenology of an SU(2) × SU(2) × U(1) model with lepton-flavour non-universality (2016, background): “[4], gauge mixing effects play a crucial role in the possible enhancement of R(D(∗)) in this model.”
Effective description of general extensions of the Standard Model: the complete tree-level dictionary (2017, background): “These bounds, together with the ones discussed below, can be relaxed by reducing the (g W)23 and g φ W couplings at the expense of increasing the corresponding (g W)`` ones [83, 84].”