Clues for flavor from rare lepton and quark decays

By Ivo Medeiros Varzielas, G. Hiller. 2015

218 citations recorded by the source corpus.

A bstractFlavor symmetries successfully explain lepton and quark masses and mixings yet it is usually hard to distinguish different models that predict the same mixing angles. Further experimental input could be available, if the agents of flavor breaking are sufficiently low in mass and detectable or if new physics with non-trivial flavor charges is sufficiently low in mass and detectable. The recent hint for lepton-nonuniversality in the ratio of branching fractions B → Kμμ over B → Kee, RK, suggests the latter, at least for indirect detection via rare decays. We demonstrate the discriminating power of the rare decay data on flavor model building taking into account viable leptonic mixings and show how correlations with other observables exist in leptoquark models. We give expectations for branching ratios B → Kℓℓ′, B(s) → ℓℓ′ and ℓ → ℓ′γ, and Higgs decays h → ℓℓ′.

Subfields: Artificial Intelligence, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/50ce560fe989ba3d410fd54df74e63b2aee9550f

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Citations in the corpus

Lepton flavor non-universality in B-meson decays from a U(2) flavor model (2015, background): “Some papers in the literature have attempted to obtain this connection in the context of partial compositeness [19, 25, 28] or leptoquark models [30].”
Physics case for an LHCb Upgrade II - Opportunities in flavour physics, and beyond, in the HL-LHC era (2018, background): “In relation to the anomalies observed, several models [272,276,277] have been developed where the branching fractions of the B→ e±μ∓ can be as large as O(10−11).”
Flavour anomalies after the RK∗ measurement (2017, background): “Another motivated pattern of couplings has been suggested in [56] using flavour symmetry.”
Review of lepton universality tests in B decays (2018, background): “ector-like fermions [180,181], or in Z0models with a gauged horizontal symmetry [213]. Concerning leptoquarks, here a single representation (either R2 or U1) can generate a CNP 9 = C NP 10 solution [176,177,195, 196,198,214,215]. This pattern can also be obtained in models with loop contributions fr”