Lepton flavor non-universality in B-meson decays from a U(2) flavor model

By A. Falkowski, Marco Nardecchia, R. Ziegler. Journal of High Energy Physics, 2015

181 citations recorded by the source corpus.

We address the recent anomalies in semi-leptonic B-meson decays using a model of fermion masses based on the U(2) flavor symmetry. The new contributions to b → sℓℓ transitions arise due to a tree-level exchange of a Z′ vector boson gauging a U(1) subgroup of the flavor symmetry. They are controlled by a single parameter and are approximately aligned to the Standard Model prediction, with constructive interference in the e-channel and destructive interference in the μ-channel. The current experimental data on semi-leptonic B-meson decays can be very well reproduced without violating existing constraints from flavor violation in the quark and lepton sectors. Our model will be tested by new measurements of b → sℓℓ transitions and also by future electroweak precision tests, direct Z′ searches, and μ-e conversion in nuclei.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/0960dab7baf6ab261a84de707309eb5266db2914

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Citations in the corpus

Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data (2017, background): “While Z ′ models can easily accommodate LFUV data [43], LFU variants like the ones in Refs.”
Charged Lepton Flavour Violation: An Experimental and Theoretical Introduction (2017, background): “In another interesting proposal, the new gauge boson corresponds to a gauged abelian subgroup of a U(2) symmetry of flavour accounting for the observed fermion masses and mixing [232]; as a consequence the flavour structure of the Z ′ couplings is fully specified and the tightest low-energy constrai”