Improving trigger efficiency for di-Higgs searches at $\sqrt{s}=13$ TeV with the ATLAS Detector

The Higgs self-coupling is one of the primary properties of the Higgs remaining to be measured. If its value deviates from the Standard Model prediction, it could provide a useful route for exploring physics beyond the Standard Model. The Higgs self-coupling is correlated with the cross section of di-Higgs production, so we aim to improve the analysis method for measuring this cross section. In this study, we demonstrate that adding b-jet and missing transverse energy (MET) triggers to the standard single and di-lepton triggers increases the total trigger efficiency for the signal by around 8% in the $HH \rightarrow b\bar{b}ll\nu\nu$ search. This efficiency gain ranges from 4-23% depending on the di-Higgs decay channel, data-taking period, and lepton flavor configuration.