Marzia Bordone

A three-site gauge model for flavor hierarchies and flavor anomalies

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- p T experiments at the LHC.

Massive vectors and loop observables: the

A bstractWe discuss the use of massive vectors for the interpretation of some recent experimental anomalies, with special attention to the muon g−2. We restrict our discussion to the case where the massive vector is embedded into a spontaneously broken gauge symmetry, so that the predictions are not affected by the choice of an arbitrary energy cut-off. Extended gauge symmetries, however, typically impose strong constraints on the mass of the new vector boson and for the muon g − 2 they basically rule out, barring the case of abelian gauge extensions, the explanation of the discrepancy in terms of a single vector extension of the standard model. We finally comment on the use of massive vectors for B-meson decay and di-photon anomalies.

g-2

We analyze the recent hints of lepton flavor universality violations in semileptonic B decays within a general effective field theory (EFT) based on a U(2)n flavor symmetry acting on the light generations of Standard Model (SM) fermions. We analyze in particular the consistency of these anomalies with the tight constraints on various low-energy observables in B and τ physics. We show that, with a moderate fine-tuning, a consistent picture for all low-energy observables can be obtained under the additional dynamical assumption that the new physics (NP) sector is coupled preferentially to third-generation SM fermions. We discuss how this dynamical assumption can be implemented in general terms within the EFT, and we identify a series of observables in τ decays which could provide further evidence of this NP framework.

case

We show how leading radiative corrections can be implemented in the general description of

Higgs pseudo observables and radiative corrections

h\rightarrow 4\ell

Testing lepton flavour universality in semileptonic Λ b → Λ c * decays

h→4ℓ decays by means of pseudo observables (PO). With the inclusion of such corrections, the PO description of

\tau

h\rightarrow 4\ell