Phenomenology of scalar leptoquarks: neutrino mass, g-2, and B-anomalies

Abstract

We consider two BSM scenarios with scalar leptoquarks (LQ), motivated by neutrino mass, muon (g-2), and anomalies in B-decay ratios. A combination of a singlet and a doublet scalar LQ can generate one-loop Majorana neutrino mass, and contribute to the observed muon and electron (g-2) values, while satisfying bounds from lepton flavour violating decays. A carefully chosen parameter space in this model carries discovery and discernability potential at the LHC/FCC from pair production, with different finalstates. On the other hand, extending the SM with a singlet and a triplet scalar LQ separately can categorically explain the observed tensions in B-decay ratios. With a minimal set of couplings, the singlet contributes to R(D)/R(D*), and the triplet to R(K)/R(K*). The Yukawa couplings can be probed from single production of the LQs at the LHC/FCC, and their reach for a range of mass is studied.