Title : 4b+X/4B+W via electroweak multi-Higgs production as smoking gun signals for the Type-I 2HDM at the LHC
Speaker : Dr. Prasenjit Sanyal (Konkuk U.)
Abstract : The existence of additional Higgs bosons, besides the one discovered by the LHC, already a decade ago, is predicted by most frameworks of new physics. Observation of a second Higgs boson (charged or neutral) will thus provide firm evidence that the underlying manifestation of the Electroweak Symmetry Breaking (EWSB) mechanism is a non-minimal one. The majority of analyses, both phenomenological and experimental ones, involving additional Higgs bosons concentrate on QCD induced production modes, However, the QCD induced processes are not necessarily to be high in new physics models owing to the non-standard couplings of the new Higgs bosons to the fermions and gauge bosons. As a reference we take the Type-I two Higgs doublet model (2HDM) as a simple extension of Standard Model where the Electroweak (EW) processes dominate over the QCD processes.
I would like to discuss a full detector-level Monte Carlo analysis to establish that the inclusive 4b + X final state via EW processes can provide simultaneous reconstruction of all the additional Higgs boson masses. I will present the algorithms for the mass reconstructions of the additional Higgs bosons. However, the challenge is to tame the large multi-jet background. As an alternative, I will discuss the 4b + W channel which can be mediated only through the EW process. The leptonic decay of the W boson and therefore the requirement of at least one lepton at the detector level is useful to evade the multi-jet background. The χ 2 variable constructed out of the signal topology can be a very useful selection criteria to reduce the t ¯t background.