Naturalness in a simple two Higgs doublet model

TL;DR

This paper investigates how a naturalness criterion constrains the parameter space of a simple two Higgs doublet model, especially in light of the 125 GeV Higgs discovery, affecting the predicted masses of additional Higgs particles.

Contribution

It introduces a naturalness-based constraint to a two Higgs doublet model, narrowing down the possible masses of additional Higgs bosons based on phenomenological considerations.

Findings

Naturalness criterion limits model parameter space.

Allowed mass ranges for additional Higgs bosons identified.

Phenomenological constraints further refine predictions.

Abstract

We study the implications of a criterion of naturalness for a simple two Higgs doublet model in the context of the discovery of a Higgs like particle with a mass at 125 GeV. This condition which measures the amount of fine tuning further limits the parameter space of this particular model and together with other phenomenological constraints leads to an allowed range of masses for the other neutral or charged Higgs bosons: H, a^{\pm}, a^0.