# Is Higgsium a possibility in 2HDMs?

## TL;DR

This paper explores whether a bound state of Higgs bosons, called Higgsium, could form in two Higgs doublet models, considering effects of higher-dimensional operators and effective field theory methods.

## Contribution

It introduces an effective field theory approach to analyze Higgs-Higgs interactions in 2HDMs, including effects of dimension six operators, to assess the formation of Higgsium.

## Key findings

- Estimated the attractive and repulsive couplings for Higgs pairs.
- Analyzed formation and decay times to evaluate bound state stability.
- Discussed implications across various 2HDM types.

## Abstract

We investigate the possibility of a Higgs-Higgs bound state in the two Higgs doublet model. Specifically we look for the effect of dimension six operators, generated by new physics at a scale of a few TeV, on the self-couplings of the heavy CP even scalar field in the model. Following the pioneering work of Grinstein and Trott, we construct an effective field theory formalism to examine the physics of the Higgs sector. The magnitudes of the attractive and repulsive coupling strengths are compared to estimate the possibility of the formation of the $H-H$ bound state. Another way to check if a bound state is formed or not is from the formation and decay times of the bound state. The possibilities in various types of two Higgs doublet models have been discussed elaborately in the paper.