Flavour anomalies and the muon $g-2$ from feebly interacting particles

Abstract

We perform a phenomenological analysis of simplified models of light, feebly interacting particles~(FIPs)that can provide a combined explanation of the anomalies in $b\to s{l}^{+}{l}^{-}$ transitions at LHCb and the anomalous magnetic moment of the muon. Different scenarios are categorised according to the explicit momentum dependence of the FIP coupling to the $b-s$ and $\mu -\mu$ vector currents and they are subject to several constraints from flavour and precision physics. We show that viable combined solutions to the muon $g-2$ and flavour anomalies exist with the exchange of a vector FIP with mass larger than $4\text{GeV}$. Interestingly, the LHC has the potential to probe this region of the parameter space by increasing the precision of the $Z\to 4\mu$ cross-section measurement. Conversely, we find that solutions based on the exchange of a lighter vector, in the $m_V<1\text{GeV}$ range, are essentially excluded by a combination of $B\to K+\text{invisible}$ and $W$-decay precision bounds.

32 pages, 4 figures. Typos corrected, published version

References in corpus (17)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• The $g-2$ of charged leptons, $\alpha (M_Z^2)$ and the hyperfine splitting of muonium
• Hadronic contribution to the muon anomalous magnetic moment to next-to-next-to-leading order
• Neutrino Trident Production: A Powerful Probe of New Physics with Neutrino Beams
• Test of lepton universality in beauty-quark decays
• Angular Distributions of B -> K ll Decays
• LEP Shines Light on Dark Matter
• Hadronic light-by-light scattering contribution to the muon anomalous magnetic moment from lattice QCD
• Enhanced electromagnetic correction to the rare $B$-meson decay $B_{s,d}\to {\mu }^{+}{\mu }^{-}$
• Implications of new evidence for lepton-universality violation in $b\to s{\ell }^{+}{\ell }^{-}$ decays
• A New Light Particle in B Decays?
• Lessons from the $B^{0,+}\to K^{\ast 0,+}{\mu }^{+}{\mu }^{-}$ angular analyses
• Search for the Rare Decay B->K nu nubar
• Measurements of differential cross-sections in four-lepton events in 13 TeV proton-proton collisions with the ATLAS detector
• On Light Resonance Interpretations of the B Decay Anomalies
• Portal Effective Theories: A framework for the model independent description of light hidden sector interactions

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• Science Case for the new High-Intensity Muon Beams HIMB at PSI
• On $(g-2{)}_{\mu }$ From Gauged $\mathrm{U}(1{)}_X$
• Dark photon and dark $Z$ mediated $B$ meson decays
• A global analysis of $b\to s\ell \ell$ data in heavy and light $Z^{\prime }$ models
• Towards excluding a light $Z^{\prime }$ explanation of $b\to s{\ell }^{+}{\ell }^{-}$
• Width effects of broad new resonances in loop observables and application to $(g-2{)}_{\mu }$
• Light scalars within the $\mathcal{C}\mathcal{P}$-conserving Aligned-two-Higgs-doublet model
• The Muon Magnetic Moment and Physics Beyond the Standard Model
• Anomalous gauge couplings vis-$\grave{a}$-vis $(g-2{)}_{\mu }$ and flavor observables
• Reappraisal of the minimal flavoured $Z^{\prime }$ scenario
• A comment on lepton mixing