Abstract
The search for Higgs trilinear self-interaction, the ability of the Higgs boson to decay into two of itself (di-Higgs), has been a major goal of contemporary experimental particle physics. Investigating channels of particle interactions where this can occur can give vital information on the likelihoods of observation. Here, we report the investigation of simulated proton-proton collisions from the Large Hadron Collider (LHC) at the Center of European Nuclear Research (CERN), at a center-of-mass
energy of 13 TeV with integrated luminosity of 137 inverse femtobarns. We isolate events in the channel of top-antitop quark pair + two Higgs bosons (ttHH), leveraging analysis tools used in the two top-antitop quark pairs channel (tttt / four-top) and same-sign dilepton analyses from the Compact Muon Solenoid (CMS) collaboration. Yields from the isolation of background events and sensitivity checks from boosted decision trees (BDT’s) indicate an upper limit for the cross section for ttHH to be around 10^2 times the standard model (SM) cross-section at 95% confidence level.
