Optimization of sensitivity for the Di-Higgs search in b¯blνqq final state in the LHC data recorded by the ATLAS detector in pp collisions at √s = 13 TeV

A study of optimization of signal sensitivity in the search for the diHiggs event in the ATLAS experiment is presented where one of the Higgs bosons decays via the H →− b¯b channel and the other via H →W W∗ with b¯blνqq as the final state . A large irreducible background contamination from tt¯ decay significantly decreases the signal sensitivity in the diHiggs search. We employ ROOT's built-in Multivariate analysis tool(TMVA) to train new physics motivated variables along with currently trained variables. An increment in the rejection of tt¯ background while keeping the signal efficiency high is observed.