Simple model for large CP violation in charm decays, B-physics anomalies, muon g-2, and Dark Matter

TL;DR

This paper proposes a minimal Standard Model extension with four new fields that simultaneously explains B decay anomalies, muon g-2, large charm CP violation, and dark matter, while satisfying all experimental constraints.

Contribution

It introduces a simple model with specific new particles that unifies explanations for multiple anomalies and dark matter in a consistent framework.

Findings

Successfully explains B decay anomalies and muon g-2.

Achieves large CP violation in charm decays consistent with LHCb.

Provides a viable dark matter candidate with correct relic density.

Abstract

We present a minimal extension of the Standard Model that can simultaneously account for the anomalies in semi-leptonic B meson decays and the muon g-2, give large CP violation in charm decays (up to the value recently measured by LHCb), and provide thermal-relic dark matter, while evading all constraints set by other flavour observables, LHC searches, and dark matter experiments. This is achieved by introducing only four new fields: a vectorlike quark, a vectorlike lepton, and two scalar fields (a singlet and a doublet) that mix due to the electroweak symmetry breaking and provide the dark matter candidate. The singlet-doublet mixing induces chirally-enhanced dipole transitions, which are crucial for the explanation of the muon g-2 discrepancy and the large charm CP violation, and allows to achieve the observed dark matter density in wide regions of the parameter space.