Explaining Dark Matter and $B$ Decay Anomalies with an $L_{\mu }-L_{\tau }$ Model

Abstract

We present a dark sector model based on gauging the $L_{\mu }-L_{\tau }$ symmetry that addresses anomalies in $b\to s{\mu }^{+}{\mu }^{-}$ decays and that features a particle dark matter candidate. The dark matter particle candidate is a vector-like Dirac fermion coupled to the $Z^{\prime }$ gauge boson of the $L_{\mu }-L_{\tau }$ symmetry. We compute the dark matter thermal relic density, its pair-annihilation cross section, and the loop-suppressed dark matter-nucleon scattering cross section, and compare our predictions with current and future experimental results. We demonstrate that after taking into account bounds from $B_s$ meson oscillations, dark matter direct detection, and the CMB, the model is highly predictive: $B$ physics anomalies and a viable particle dark matter candidate, with a mass of $\sim (5-23)$~GeV, can be accommodated only in a tightly-constrained region of parameter space, with sharp predictions for future experimental tests. The viable region of parameter space expands if the dark matter is allowed to have $L_{\mu }-L_{\tau }$ charges that are smaller than those of the SM leptons.

arXiv comment27 pages, 6 figures. Matches published version

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