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Combined explanations of (g2)μ, RD(*), RK(*) anomalies in a two-loop radiative neutrino mass model

Shaikh Saad*

  • Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, USA

  • *shaikh.saad@okstate.edu

Phys. Rev. D 102, 015019 – Published 20 July, 2020

DOI: https://doi.org/10.1103/PhysRevD.102.015019

Abstract

Motivated by the long-standing tension in the muon anomalous magnetic moment (AMM) and persistent observations of B-physics anomalies in RD(*) and RK(*) ratios, we construct a simple two-loop radiative neutrino mass model, and propose a combined explanations of all these apparently disjoint phenomena within this framework. Our proposed model consists of two scalar leptoquarks (LQs), a SU(2)L singlet S1(3¯,1,1/3) and a SU(2)L triplet S3(3¯,3,1/3) to accommodate RD(*) and RK(*) anomalies, respectively. The muon receives chirality-enhanced contribution toward its g2 due to the presence of S1 LQ that accounts for the observed deviation from the Standard Model prediction. Furthermore, we introduce a SU(2)L singlet scalar diquark ω(6¯,1,2/3), which is necessary to break lepton number and generate neutrino mass radiatively with the aid of S1 and S3 LQs. We perform a detailed phenomenological analysis of this set-up and demonstrate its viability by providing benchmark points where a fit to the neutrino oscillation data together with proper explanations of the muon AMM puzzle and flavor anomalies are accomplished while simultaneously meeting all other flavor violation and collider bounds.

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