Leptophilic bosons and muon g-2 at lepton colliders

TL;DR

This paper explores the potential of a light leptophilic boson to explain the muon g-2 anomaly and demonstrates that future lepton colliders could definitively discover or exclude such particles.

Contribution

It identifies the viable parameter space for leptophilic bosons within the two-Higgs-doublet model and analyzes their detectability at future lepton colliders.

Findings

Viable parameter space for leptophilic bosons explained.

Future lepton colliders can discover or rule out these particles.

Leptophilic bosons could be a portal to dark matter.

Abstract

A light leptophilic boson (scalar or pseudoscalar) has been postulated to explain the muon g-2 anomaly and could be a portal to dark matter. Realizing the leptophilic nature of a singlet boson in the framework of the two-Higgs-doublet-Model of type-X, we identify the parameter space viable for the explanation of the updated muon g-2 discrepancy. It is then shown that such a hypothetical particle will be unambiguously ruled out or discovered via the Yukawa process at a lepton collider designed as a Higgs factory.