Abstract
We present a three-site Pati–Salam gauge model able to explain the Standard Model flavor hierarchies while, at the same time, accommodating the recent experimental hints of lepton-flavor non-universality in B decays. The model is consistent with low- and high-energy bounds, and predicts a rich spectrum of new states at the TeV scale that could be probed in the near future by the high-pT experiments at the LHC.
Highlights
Recent data on semileptonic B decays indicate anomalous violations of Lepton Flavor Universality (LFU) of short-distance origin
A class of motivated models are those based on TeVscale new physics (NP) coupled mainly to the third generation of SM fermions, with subleading effects on the light generations controlled by an approximate U(2)Q × U(2)L flavor symmetry [30]
If unambiguously confirmed as beyond-the-SM signals, the recent B-physics anomalies would lead to a significant shift in our understanding of fundamental interactions
Summary
Recent data on semileptonic B decays indicate anomalous violations of Lepton Flavor Universality (LFU) of short-distance origin. As recently shown in [31] (see [13,17,26]), an Effective Field Theory (EFT) based on this flavor symmetry allows us to account for the observed semileptonic LFU anomalies taking into account the tight constraints from other low-energy data [32,33]. A key aspect of this construction is the hypothesis that electroweak symmetry breaking (EWSB) occurs via a Higgs field sitting only on the third-generation site: this assumption allows us to derive the hierarchical structure of the Yukawa couplings as a consequence of the hierarchies of the vacuum expectation values (VEVs) controlling the breaking of the initial gauge group down to the SM. The localization of the Higgs field on the thirdgeneration site provides a natural screening mechanism for the Higgs mass term against the heavy energy scales related to the symmetry breaking of the heavy fields coupled to the light generations
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