2025 Articles

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 √𝒔 = 13 TeV 𝑝𝑝 collisions with the ATLAS detector

Aad, G.; Aakvaag, E.; Abbott, B.; Abdelhameed, S.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboelela, M.; Aboulhorma, A.; Abramowicz, H.; Abulaiti, Y.; Acharya, B. S.; Ackermann, A.; Adam Bourdarios, C.; Adamczyk, L.; Addepalli, S. V.; Addison, M. J.; Adelman, J.; Adiguzel, A.; Adye, T.; Affolder, A. A.; Afik, Y.; Agaras, M. N.; Aggarwal, A.; Agheorghiesei, C.; Ahmadov, F.; Ahuja, S.; Ai, X.; Aielli, G.; Aikot, A.; Ait Tamlihat, M.; Aitbenchikh, B.; Akbiyik, M.; Åkesson, T. P. A.; Akimov, A. V.; Akiyama, D.; Akolkar, N. N.; Aktas, S.; Alberghi, G. L.; Albert, J.; Angerami, Aaron; Busch, Elena Laura; Brooijmans, Gustaaf H.; Cole, Brian A.; Gilbert, B. J.

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 𝑊 boson and a 125 GeV Higgs boson h. The search is performed in final states with one charged lepton, missing transverse momentum, and jets using proton-proton collision data at √𝒔 = 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 fb⁻¹. The search is conducted by examining the reconstructed invariant mass distribution of the 𝑊𝒉 candidates for evidence of a localised excess in the charged Higgs boson mass range from 250 GeV to 3 TeV. No significant excess of data over the expected background 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 𝑊𝒉.