Abstract
We present a dark sector model based on gauging the L μ − L τ symmetry that addresses anomalies in b → sμ + μ − decays and that features a particle dark matter candidate. The dark matter particle candidate is a vector-like Dirac fermion coupled to the Z′ gauge boson of the L μ − L τ 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 ∼ (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 μ − L τ charges that are smaller than those of the SM leptons.
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Altmannshofer, W., Gori, S., Profumo, S. et al. Explaining dark matter and B decay anomalies with an L μ − L τ model. J. High Energ. Phys. 2016, 106 (2016). https://doi.org/10.1007/JHEP12(2016)106
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DOI: https://doi.org/10.1007/JHEP12(2016)106