Truth level signal efficiency with lepton pT cuts in 2-lepton final state of the decay A → HW → bbWW in 2HDM model

Modern high-energy physics experiments produce vast amounts of data, and trigger systems are crucial for selecting the most interesting events. In this project, we look at the trigger efficiency for the dileptonic final state of the 2HDM process A → H±W∓ → (H → b¯b)WW using Monte Carlo simulations at the truth level. We emulate the ATLAS lepton triggers by applying pT cuts to truth electrons and muons, compute the signal efficiency across a scan of (mA,mH) mass points, and study the effect of additional kinematic selection cuts.
To visualize these results, we create two-dimensional heatmaps in (mA,mH) highlighting regions of high and low trigger efficiency. We find that an inclusive (OR) combination of single-lepton and di-lepton selections provides the best coverage, with efficiencies of about 87% at 300/200 GeV rising to ∼ 97.8% near 700/300 GeV, while a single-muon path alone underperforms at low masses. This analysis quantifies the ATLAS trigger acceptance for this specific signal at truth level and motivates using combined electron–muon menus for studies of this channel.