Combination of searches for singly and doubly charged Higgs bosons produced via vector-boson fusion in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

TL;DR

This paper combines searches for singly and doubly charged Higgs bosons produced via vector-boson fusion at 13 TeV using ATLAS data, setting new constraints on their production and decay in the Georgi-Machacek model.

Contribution

It presents the first combined analysis of both charged Higgs bosons via vector-boson fusion at 13 TeV, providing the most stringent constraints to date.

Findings

Constraints on production cross-section times branching fraction for masses 200-3000 GeV.

Most stringent limits to date within the Georgi-Machacek model.

Analysis uses 140 fb$^{-1}$ of data from ATLAS during Run 2.

Abstract

A combination of searches for singly and doubly charged Higgs bosons, $H^{\pm}$ and $H^{\pm\pm}$, produced via vector-boson fusion is performed using 140 fb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of 13 TeV, collected with the ATLAS detector during Run 2 of the Large Hadron Collider. Searches targeting decays to massive vector bosons in leptonic final states (electrons or muons) are considered. New constraints are reported on the production cross-section times branching fraction for charged Higgs boson masses between 200 GeV and 3000 GeV. The results are interpreted in the context of the Georgi-Machacek model for which the most stringent constraints to date are set for the masses considered in the combination.