Fermionic Singlet Dark Matter in One-Loop Solutions to the $R_K$ Anomaly: A Systematic Study

Abstract

We study the dark matter phenomenology of Standard Model extensions addressing the reported anomaly in the $R_K$ observable at one-loop. The article covers the case of fermionic singlet DM coupling leptophilically, quarkphilically or amphiphilically to the SM. The setup utilizes a large coupling of the new particle content to the second lepton generation to explain the $R_K$ anomaly, which in return tends to diminish the dark matter relic density. Further, dark matter direct detection experiments provide stringent bounds even in cases where the dark matter candidate only contributes a small fraction of the observed dark matter energy density. In fact, direct detection rules out all considered models as an explanation for the $R_K$ anomaly in the case of Dirac dark matter. Conversely, for Majorana dark matter, the $R_K$ anomaly can be addressed in agreement with direct detection in coannihilation scenarios. For leptophilic dark matter this region only exists for $M_{\text{DM}}\lesssim 1000\mathrm{GeV}$ and dark matter is underabundant. Quarkphilic and amphiphilic scenarios even provide narrow regions of parameter space where the observed relic density can be reproduced while offering an explanation to $R_K$ in agreement with direct detection experiments.

48 pages, 7 tables, 16 figures

References in corpus (18)

• A direct empirical proof of the existence of dark matter
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• Search for lepton-universality violation in $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Search for photon line-like signatures from Dark Matter annihilations with H.E.S.S
• New Gamma-Ray Contributions to Supersymmetric Dark Matter Annihilation
• Simplified Dark Matter Models for the Galactic Center Gamma-Ray Excess
• Constraining the Spin-Dependent WIMP-Nucleon Cross Sections with XENON1T
• Leptoquark Flavor Patterns & B Decay Anomalies
• Robust collider limits on heavy-mediator Dark Matter
• Fermionic WIMPs and Vacuum Stability in the Scotogenic Model
• Impact of the $b\to sll$ anomalies on dark matter physics
• Search for top squark pair production using dilepton final states in pp collision data collected at $\sqrt{s}=$ 13 TeV
• A minimal flavored $U(1{)}^{\prime }$ for $B$-meson anomalies
• B anomalies and dark matter: a complex connection
• The Dark Side of 4321
• The time-dependent angular analysis of $B_d\to K_S\ell \ell$, a new benchmark for new physics
• Phenomenology of the Inert (2+1) and (4+2) Higgs Doublet Models
• Composite Dark Matter and a horizontal symmetry

Cited by in corpus (3)

• Muon $g-2$ and $B$-anomalies from Dark Matter
• Unitarity Bounds on Effective Field Theories at the LHC
• Perturbative unitarity constraints on generic Yukawa interactions