Limiting two-Higgs-doublet models

TL;DR

This paper updates constraints on two-Higgs-doublet models, finding that only the lepton-specific type can account for the muon g-2 anomaly within certain parameter regions, considering various experimental and theoretical limits.

Contribution

It provides a comprehensive analysis of constraints on 2HDMs, identifying the lepton-specific type as uniquely capable of explaining the muon g-2 anomaly under current data.

Findings

Only lepton-specific 2HDM explains muon g-2 anomaly.

Large tanβ with light CP-odd Higgs is favored.

Severe constraints from vacuum stability, electroweak precision, and LHC data.

Abstract

Updating various theoretical and experimental constraints on the four different types of two-Higgs-doublet models (2HDMs), we find that only the "lepton-specific" (or "type X") 2HDM can explain the present muon (g-2) anomaly in the parameter region of large $\tan\beta$, a light CP-odd Higgs boson, and heavier CP-even and charged Higgs bosons which are almost degenerate. The severe constraints on the models come mainly from the consideration of vacuum stability and perturbativity, the electroweak precision data, $B$ physics observables like $b\to s \gamma$ as well as the 125 GeV Higgs boson properties measured at the LHC.