The 2HDM-X and Large Hadron Collider Data

TL;DR

This paper introduces the 2HDM-X, a flexible two Higgs doublet model framework compatible with LHC data, unifying various types and allowing comprehensive interpretation of Higgs measurements.

Contribution

The paper proposes the 2HDM-X, a general two Higgs doublet model that includes and extends traditional types, facilitating analysis of LHC Higgs data within a broader theoretical context.

Findings

Best fit with suppressed tau tau and SM-like b bbar signals.

Good fits also achieved with lepton-specific and democratic models.

Framework enables interpretation of future Higgs data.

Abstract

We study the consistency of two Higgs doublet models in light of the new bosonic particle discovery at the LHC. We work within a general setup that we call the 2HDM-X, in which the quarks couple to both scalar doublets with aligned couplings such that flavor-changing neutral currents are absent at tree level. The 2HDM-X encompasses the traditional Type I, Type II, lepton specific, and flipped models, but also provides for more general possibilities. The best fit to the current data with a suppressed tau tau signal and a b bbar signal of Standard Model strength is given by the 2HDM-X with specific parameter choices; however, very good fits are also obtained within the lepton-specific model and a democratic model, the 2HDM-D, in which both the up-type and down-type quarks couple to each doublet with equal strengths. The approach provides a general framework in which to interpret future LHC Higgs data within extensions of the Standard Model with two Higgs doublets.