Towards excluding a light $Z^{\prime }$ explanation of $b\to s{\ell }^{+}{\ell }^{-}$

Abstract

The discrepancies between $b\to s{\ell }^{+}{\ell }^{-}$ data and the corresponding Standard Model predictions constitute the most significant hints for new physics (at the TeV scale or below) currently available. In fact, many scenarios that can account for these anomalies have been proposed in the literature. However, only a single light new physics explanation, i.e. with a mass below the $B$ meson scale, is possible: a light $Z^{\prime }$ boson. In this article, we point out that improved limits on $B\to K^{(\ast )}\nu \nu$, including the experimental sensitivities required for a proper treatment of the necessarily sizable $Z^{\prime }$ width, together with the forthcoming Belle~II analyses of $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}+\mathrm{invisible}$, can rule out a $Z^{\prime }$ explanation of $b\to s{\ell }^{+}{\ell }^{-}$ data with a mass below $\approx 4$GeV. Importantly, such a light $Z^{\prime }$ is the only viable single particle solution to the $b\to s{\ell }^{+}{\ell }^{-}$ anomalies predicting $R(K^{(\ast )})>0$ in high $q^2$ bins, therefore providing an essential consistency test of data.

8 pages, 4 figures

References in corpus (65)

• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• The anomalous magnetic moment of the muon in the Standard Model
• Leading hadronic contribution to the muon magnetic moment from lattice QCD
• 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
• A new evaluation of the hadronic vacuum polarisation contributions to the muon anomalous magnetic moment and to $\mathbf{\alpha }({\mathbf{m}}_{\mathbf{Z}}^2)$
• B-physics anomalies: a guide to combined explanations
• The hadronic light-by-light scattering contribution to the muon anomalous magnetic moment from lattice QCD
• 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 $L_{\mu }-L_{\tau }$
• Short-distance constraints for the HLbL contribution to the muon anomalous magnetic moment
• Test of lepton universality in beauty-quark decays
• Addressing the LHC flavour anomalies with horizontal gauge symmetries
• Longitudinal short-distance constraints for the hadronic light-by-light contribution to $(g-2{)}_{\mu }$ with large-$N_c$ Regge models
• Hadronic vacuum polarization: $(g-2{)}_{\mu }$ versus global electroweak fits
• The muon $g$-2 and $\Delta \alpha$ connection
• B-decay Anomalies in a Composite Leptoquark Model
• Quark Flavor Phenomenology of the QCD Axion
• Family non-universal Z' models with protected flavor-changing interactions
• Simultaneous Explanation of the $R_K$ and $R_{D^{(\ast )}}$ Puzzles: a Model Analysis
• Leptoquark Flavor Patterns & B Decay Anomalies
• Branching fraction measurements of the rare $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$ and $B_s^0\to f_2^{\prime }(1525){\mu }^{+}{\mu }^{-}$ decays
• Phenomenology of an $SU(2)\times SU(2)\times U(1)$ model with lepton-flavour non-universality
• The muon g-2 and the bounds on the Higgs boson mass
• Lepton Flavor Non-Universality in B decays from Dynamical Yukawas
• Implications of new evidence for lepton-universality violation in $b\to s{\ell }^{+}{\ell }^{-}$ decays
• Low-energy phenomenology of scalar leptoquarks at one-loop accuracy
• Angular analysis of the $B^{+}\to K^{\ast +}{\mu }^{+}{\mu }^{-}$ decay
• A New Light Particle in B Decays?
• Search for Axion-Like Particles produced in $e^{+}{e}^{-}$ collisions at Belle II
• $b\to s\ell \ell$ Global Fits after $R_{K_S}$ and $R_{K^{\ast +}}$
• Tests of lepton universality using $B^0\to K_S^0{\ell }^{+}{\ell }^{-}$ and $B^{+}\to K^{\ast +}{\ell }^{+}{\ell }^{-}$ decays
• More Indications for Lepton Nonuniversality in $b\to s{\ell }^{+}{\ell }^{-}$
• Measurement of properties of B${}_{\mathrm{s}}^0\to {\mu }^{+}{\mu }^{-}$ decays and search for B${}^0\to {\mu }^{+}{\mu }^{-}$ with the CMS experiment
• A Model of Muon Anomalies
• Combined explanations of $(g-2{)}_{\mu }$, $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ anomalies in a two-loop radiative neutrino mass model
• Explaining $b\to s{\ell }^{+}{\ell }^{-}$ and the Cabibbo Angle Anomaly with a Vector Triplet
• Neutrino mixing and $R_K$ anomaly in $U(1{)}_X$ models: a bottom-up approach
• $Z^{\prime }$ models with less-minimal flavour violation
• Vector Leptoquarks Beyond Tree Level
• Flavourful $Z^{\prime }$ models for $R_{K^{(\ast )}}$
• Search for $B^{+}\to K^{+}\nu \bar{\nu }$ decays using an inclusive tagging method at Belle II
• LHCb anomalies from a natural perspective
• Gauging the accidental symmetries of the Standard Model, and implications for the flavour anomalies
• Effective Theory Approach to New Physics with Flavour: General Framework and a Leptoquark Example
• Global Analysis of Leptophilic Z' Bosons
• Muonic Force Behind Flavor Anomalies
• Flavor Anomalies in Heavy Quark Decays
• Combined Explanation of the $Z\to b\bar{b}$ Forward-Backward Asymmetry, the Cabibbo Angle Anomaly, $\tau \to \mu \nu \nu$ and $b\to s{\ell }^{+}{\ell }^{-}$ Data
• A Common Origin of Neutrino Masses and $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ Anomalies
• Search for an invisibly decaying $Z^{\prime }$ boson at Belle II in $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}(e^{\pm }{\mu }^{\mp })$ plus missing energy final states
• Mounting Evidence for the Violation of Lepton Flavor Universality
• Complete Vector-like Fourth Family with ${\mathrm{U}(1)}^{\prime }$: A Global Analysis
• On the significance of new physics in $b\to s{\ell }^{+}{\ell }^{-}$ decays
• On Light Resonance Interpretations of the B Decay Anomalies
• Anomalous $Z^{\prime }$ bosons for anomalous $B$ decays
• $U(1{)}_{B_3-L_2}$ Explanation of the Neutral Current $B-$Anomalies
• Low Scale $U(1{)}_X$ Gauge Symmetry as an Origin of Dark Matter, Neutrino Mass and Flavour Anomalies
• A model for the Singlet-Triplet Leptoquarks
• $B$ decay anomalies from nonabelian local horizontal symmetry
• Flavour anomalies and the muon $g-2$ from feebly interacting particles
• Global Fits of Third Family Hypercharge Models to Neutral Current B-Anomalies and Electroweak Precision Observables
• Large Hadron Collider Constraints on Some Simple $Z^{\prime }$ Models for $b\to s{\mu }^{+}{\mu }^{-}$ Anomalies
• Quark-Lepton Connections in $Z^{\prime }$ Mediated FCNC Processes: Gauge Anomaly Cancellations at Work
• Associated $Z^{\prime }$ production in the flavorful $U(1)$ scenario for $R_{K^{(\ast )}}$
• Implications of light $Z^{\prime }$ on semileptonic $B(B_s)\to T\{K_2^{\ast }(1430)$ $(f_2^{\prime }(1525))\}{\ell }^{+}{\ell }^{-}$ decays at large recoil

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• Decoding the $B\to K\nu \nu$ excess at Belle II: kinematics, operators, and masses
• Review of Semileptonic $B$ Anomalies
• 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
• Search for an invisible $Z^{\prime }$ in a final state with two muons and missing energy at Belle II
• Width effects of broad new resonances in loop observables and application to $(g-2{)}_{\mu }$
• Search for a ${\tau }^{+}{\tau }^{-}$ resonance in $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}{\tau }^{+}{\tau }^{-}$ events with the Belle II experiment
• Neutrinophilic DM annihilation in a model with $U(1{)}_{L_{\mu }-L_{\tau }}\times U(1{)}_H$ gauge symmetry
• Probing invisible particles with charm