Search for a heavy charged Higgs boson decaying into a $W$ boson and a Higgs boson in final states with leptons and $b$-jets in $\sqrt{s} = 13$ TeV $pp$ collisions with the ATLAS detector

The ATLAS collaboration
Aad, Georges , Aakvaag, Erlend , Abbott, Braden Keim , Abdelhameed, Sara , Abeling, Kira , Abicht, Nils Julius , Abidi, Haider , Aboelela, Mohammed , Aboulhorma, Asmaa , Abramowicz, Halina
JHEP 02 (2025) 143, 2025.

Abstract (data abstract)
This article presents a search for a heavy charged Higgs boson produced in association with a top quark and a bottom quark, and decaying into a ๐‘Š boson and a 125 GeV Higgs boson โ„Ž. The search is performed in final states with one charged lepton, missing transverse momentum, and jets using protonโ€“proton collision data at โˆš๐‘  = 13 TeV recorded with the ATLAS detector during Run 2 of the LHC at CERN. This data set corresponds to a total integrated luminosity of 140 fbโˆ’1. The search is conducted by examining the reconstructed invariant mass distribution of the ๐‘Š โ„Ž candidates for evidence of a localised excess in the charged Higgs boson mass range from 250 GeV to 3 TeV . No significant excess is observed and 95% confidence-level upper limits between 2.8 pb and 1.2 fb are placed on the production cross-section times branching ratio for charged Higgs bosons decaying into ๐‘Š โ„Ž.

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