Light dark matter, rare B decays with missing energy in Lμ-Lτ model with a scalar leptoquark

Abstract

We investigate the phenomenology of light GeV-scale fermionic dark matter in the U(1)Lμ-Lτ gauge extension of the Standard Model. Heavy neutral fermions alongside with a S1(3¯,1,1/3) scalar leptoquark and an inert scalar doublet are added to address the flavor anomalies and light neutrino mass respectively. The light gauge boson associated with the U(1)Lμ-Lτ gauge group mediates a dark to visible sector and helps to obtain the correct relic density. Aided with a colored scalar, we constrain the new model parameters by using the branching ratios of various b→sll and b→sγ decay processes as well as the lepton flavor nonuniversality observables RK(∗) and then show the implication on the branching ratios of some rare semileptonic B→(K(∗),φ)+ missing energy processes.