Phenomenology of an SU(2) × SU(2) × U(1) model with lepton-flavour non-universality

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

211 citations recorded by the source corpus.

A bstractWe 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 RM = 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 RM ≃ 1.

Subfields: Artificial Intelligence, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/a70112d282a6907d37742984da84aceda3799923

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Citations in the corpus

Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, background): “The tree-level mediators that can explain the R(D)-R(D⇤) anomaly are a W 0 [925, 926, 943, 946] generating CVL , a charged color-neutral scalar [999, 1031–1037] generating CSL,R in Eq.”
Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data (2017, background): “I C 9μ = −C 10μ: This pattern can be achieved in Z ′ models with loop-induced couplings [53] or in Z ′ models with heavy vector-like fermions [54] which posses also LFUV.”
Effective description of general extensions of the Standard Model: the complete tree-level dictionary (2017, background): “But these limits can always be made compatible with the lepton and quark (11)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].”
Beyond the Standard Model Physics at the HL-LHC and HE-LHC (2018, background): “However, typical models encounter problems with current LHC data since they result in large contributions to pp ! ⌧⌧ cross-section, mediated by the neutral partner of the W 0 [438,444,445].”