Dark photon and dark $Z$ mediated $B$ meson decays

Abstract

We study flavor changing neutral current decays of $B$ and $K$ mesons in the dark $U(1{)}_D$ model, with the dark photon/dark $Z$ mass between 10 MeV and 2 GeV. Although the model provides an improved fit (compared to the standard model) to the differential decay distributions of $B\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$, with $\ell =\mu ,e$, and $B_s\to \varphi {\mu }^{+}{\mu }^{-}$, the allowed parameter space is ruled out by measurements of atomic parity violation, $K^{+}\to {\mu }^{+}+invisible$ decay, and $B_s-{\overline{B}}_s$ mixing, among others. To evade constraints from low energy data, we extend the model to allow for (1) additional invisible $Z_D$ decay, (2) a direct vector coupling of $Z_D$ to muons, and (3) a direct coupling of $Z_D$ to both muons and electrons, with the electron coupling fine-tuned to cancel the $Z_D$ coupling to electrons via mixing. We find that only the latter case survives all constraints.

34 pages, 13 figures, 1 table. Updated with the LHCb results in 2212.09153. Version to appear in JHEP

References in corpus (13)

• Search for $A^{\prime }\to {\mu }^{+}{\mu }^{-}$ decays
• Precision Measurement of the Weak Charge of the Proton
• $\Delta M_s$ theory precision confronts flavour anomalies
• Dark matter and a new gauge boson through kinetic mixing
• Higgs boson decays to four fermions through an abelian hidden sector
• New weakly-coupled forces hidden in low-energy QCD
• A New Light Particle in B Decays?
• KL to pi0 e+ e- and KL to pi0 mu+ mu- : A binary star on the stage of flavor physics
• Nonstandard neutrino interactions at COHERENT, DUNE, T2HK and LHC
• On Light Resonance Interpretations of the B Decay Anomalies
• Towards excluding a light $Z^{\prime }$ explanation of $b\to s{\ell }^{+}{\ell }^{-}$
• A Robust Description of Hadronic Decays in Light Vector Mediator Models
• Dark $Z$ Implication for Flavor Physics

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• Constraints on the $U(1{)}_{B-L}$ model from global QCD analysis