Speakers
Description
The Higgs boson self-coupling is one of the most vital measurements among the studies of Higgs boson properties, and such coupling can be measured in the non-resonant di-Higgs production. The cross-section of this channel, as predicted by the standard model (SM), is at O(fb), however, di-Higgs production can be promoted significantly in many beyond the SM (BSM) theories, e.g., through an s-channel narrow width resonance. In this study, we investigate the resonance production in the context of RS1 KK graviton, the RS1 radion as well as the NMSSM. Those three types of productions have similar signal topologies, in which the resonance is produced through gluon-gluon fusion and then followed by the resonance decays to two Higgs bosons (HH) or Higgs plus another scalar (HY). The sequential decays studied here are HH to bbZZ with one Z boson decays to two leptons and the other Z decays to two jets or two neutrinos. In this study, we scan a large range of resonance mass for all three types of signals from 260 GeV to 4 TeV. We utilize the TMVA method to perform a parametrized BDT study to separate signals from backgrounds, to avoid several hundreds of BDT trainings. We find the parametrized BDT method has comparable separation power when compared with training one signal at a time. This study is based on MC events generated by CMS.
