Abstract
We study the gauged U(1)_{L_mu -L_tau } scotogenic model with emphasis on latest measurement of LHCb R_{K^{(*)}} anomaly and AMS-02 positron excess. In this model, neutrino masses are induced at one-loop level with Z_2-odd particles, i.e., right-handed neutrinos N_ell (ell =e,mu ,tau ) and inert scalar doublet eta inside the loop. Meanwhile, the gauged U(1)_{L_mu -L_tau } symmetry is broken spontaneously by the scalar singlet S, resulting to the massive gauge boson Z'. Provided certain couplings to quarks induced by heavy vector-like quarks, the gauge boson Z' would contribute to the transition brightarrow s mu ^+mu ^-, hence explain the R_{K^{(*)}} anomaly. As for the Majorana fermion DM N, the gauge boson Z' and the singlet Higgs H_0 will generate various annihilation channels, among which the NNrightarrow Z'Z' and NNrightarrow Z'H_0(rightarrow Z'Z') channel could be used to interpret the AMS-02 positron excess. We give a comprehensive analysis on model parameter space with consider various current constraints. The combined analysis shows that the R_{K^{(*)}} anomaly and AMS-02 positron excess can be explained simultaneously.
Highlights
Tiny neutrino mass and non-baryonic dark matter (DM) are the two missing pieces of standard model (SM)
Except the evidences from neutrino mass and DM, the hint from flavor physics may call for the physics beyond standard model (BSM)
Neutrino masses are generated at one-loop level via N and η propagating in the loop as the original scotogenic model
Summary
Tiny neutrino mass and non-baryonic dark matter (DM) are the two missing pieces of standard model (SM). An appealing pathway to link them together is the scotogenic model [1,2], which realizes tiny neutrino mass via radiative process [3,4,5] with DM running in the loop. The indirect detection experiments, such as PAMELA [132], Fermi-LAT [133], and AMS-02 [134,135,136], have reported a significance positron fraction excess in the cosmic-ray, while no obvious antiproton excess is observed [137] This can be interpreted by DM dominantly annihilating into leptonic final states [138,139,140,141,142].2.
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