Abstract
We investigate the LHC discovery prospects for a heavy Higgs boson decaying into the Standard Model Higgs boson and additional weak bosons. We consider a generic model-independent new physics configuration where this decay proceeds via a cascade involving other intermediate scalar bosons and focus on an LHC final-state signature comprised either of four b-jets and two charged leptons or of four charged leptons and two b-jets. We design two analyses of the corresponding signals, and demonstrate that a 5{\sigma} discovery at the 14 TeV LHC is possible for various combinations of the parent and daughter Higgs-boson masses. We moreover find that the Standard Model backgrounds can be sufficiently rejected to guarantee the reconstrution of the parent Higgs boson mass. We apply our analyses to the Type-II Two-Higgs-Doublet Model and identify the regions of the parameter space to which the LHC is sensitive.
Highlights
The discovery of a Higgs boson whose properties are consistent with the expectations of the standard model (SM) has undoubtedly been the triumph of the Large Hadron Collider (LHC) far [1,2,3,4]
We consider a generic model-independent new physics configuration where this decay proceeds via a cascade involving other intermediate scalar bosons and focus on an LHC final-state signature comprised either of four b-jets and two charged leptons or of four charged leptons and two b-jets
The proof of existence of the Higgs boson has provided an additional tool to narrow down the possibilities for new physics, additional constraints on the new physics parameter spaces being imposed by enforcing the Higgsboson branching ratio and production cross section predictions to agree with the measured values
Summary
The discovery of a Higgs boson whose properties are consistent with the expectations of the standard model (SM) has undoubtedly been the triumph of the Large Hadron Collider (LHC) far [1,2,3,4]. A general feature of heavier Higgs bosons consists in the dominance of Higgs-to-Higgs decays in association with a weak boson as soon as they are kinematically open [10,11,12] This has motivated the search for the corresponding signals in LHC data by both the ATLAS [13,14,15,16] and CMS [17,18,19] collaborations, as well as a series of theoretical works both in the 2HDM [20,21,22,23,24,25,26,27,28,29,30,31,32,33] and other (less minimal) new physics models [34,35,36,37,38,39].
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