Searching for the $W\gamma$ decay of a charged Higgs boson

Abstract

We study the prospects for charged Higgs boson searches in the $W\gamma$ decay channel. This loop-induced decay channel can be important if the charged Higgs is fermiophobic, particularly when its mass is below the $WZ$ threshold. We identify useful kinematic observables and evaluate the future Large Hadron Collider sensitivity to this channel using the custodial-fiveplet charged Higgs in the Georgi-Machacek model as a fermiophobic benchmark. We show that the LHC with 300~fb${}^{-1}$ of data at 14~TeV will be able to exclude charged Higgs masses below about 130~GeV for almost any value of the SU(2)${}_L$-triplet vacuum expectation value in the model, and masses up to 200~GeV and beyond when the triplet vacuum expectation value is very small. We describe the signal simulation tools created for this analysis, which have been made publicly available.

32 pages, 12 figures and 4 tables; v2: references added, typo fixed, match the published version

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• The $W\gamma$ decay of the elusive charged Higgs boson in the two-Higgs-doublet model with vectorlike fermions
• The Radiation Valley and Exotic Resonances in $W\gamma$ Production at the LHC
• $WW\gamma$ production at hadron colliders with NLO QCD+EW corrections and parton shower effects
• Search for a resonance decaying to a W boson and a photon in proton-proton collisions at $\sqrt{s}$ = 13 TeV using leptonic W boson decays
• Fermionic decay of charged Higgs boson in low mass region in Georgi Machacek Model
• Charting the new physics through one-loop effects in the muon magnetic dipole moment