Lepton Flavor Non-Universality in B-meson Decays from a U(2) Flavor Model

Abstract

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 $b\to s\ell \ell$ transitions arise due to a tree-level exchange of a $Z^{\prime }$ 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 $\mu$-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 $b\to s\ell \ell$ transitions and also by future electroweak precision tests, direct $Z^{\prime }$ searches, and $\mu$-$e$ conversion in nuclei.

23 pages, 2 figures, references added, matches published version

References in corpus (34)

• Big-Bang Nucleosynthesis
• Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Explaining $h\to {\mu }^{\pm }{\tau }^{\mp }$, $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ and $B\to K{\mu }^{+}{\mu }^{-}/B\to K{e}^{+}{e}^{-}$ in a two-Higgs-doublet model with gauged $L_{\mu }-L_{\tau }$
• Effective field theory approach to $b\to s\ell {\ell }^{(\prime )}$, $B\to K^{(\ast )}\nu \bar{\nu }$ and $B\to D^{(\ast )}\tau \nu$ with third generation couplings
• Addressing the LHC flavour anomalies with horizontal gauge symmetries
• Angular analysis and differential branching fraction of the decay $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$
• Lepton Flavor Violation in B Decays?
• $SU(2)\times U(1)$ gauge invariance and the shape of new physics in rare $B$ decays
• Lepton-flavour violating $B$ decays in generic $Z^{\prime }$ models
• Hint of Lepton Flavour Non-Universality in $B$ Meson Decays
• Family non-universal Z' models with protected flavor-changing interactions
• Search for the decay $B_s^0\to {\overline{D}}^0{f}_0(980)$
• Search for physics beyond the standard model in dilepton mass spectra in proton-proton collisions at sqrt(s) = 8 TeV
• A Dark Matter Relic From Muon Anomalies
• Lepton universality violation and lepton flavor conservation in $B$-meson decays
• Violation of lepton flavour universality in composite Higgs models
• Predictions for Lepton Flavor Universality Violation in Rare B Decays in Models with Gauged $L_{\mu }-L_{\tau }$
• Diagnosing lepton-nonuniversality in $b\to s\ell \ell$
• Scalar leptoquarks and the rare B meson decays
• Bounding wide composite vector resonances at the LHC
• Lepton flavor non-universality in $b\to s{\ell }^{+}{\ell }^{-}$ processes
• Global fits to b -> s ll data and signs for lepton non-universality
• $\mu -e$ conversion in nuclei within the CMSSM seesaw: universality versus non-universality
• Shedding light on the $b\to s$ anomalies with a dark sector
• Direct and indirect signals of natural composite Higgs models
• Implications of $b\to s$ measurements
• Explaining the Lepton Non-universality at the LHCb and CMS from a Unified Framework
• Study of the rare semileptonic decays $B_d^0\to K^{\ast }{l}^{+}{l}^{-}$ in scalar leptoquark model
• Are the B decay anomalies related to neutrino oscillations?
• Charged-Lepton Mixing and Lepton Flavor Violation
• Minimal Lepton Flavor Violation Implications of the $b\to s$ Anomalies
• Clues for flavor from rare lepton and quark decays
• Form factors from lattice QCD
• Electroweak constraints on flavorful effective theories

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