Multi-Lepton Signals of Multiple Higgs Bosons

Abstract

We identify and investigate novel multi-lepton signatures of extended Higgs sectors at the LHC in the guise of CP- and flavor-conserving two-Higgs-doublet models (2HDMs). Rather than designing individual searches tailored to specific 2HDM signals, we employ the combination of many exclusive multi-lepton search channels to probe the collective signal from the totality of production and decay processes. Multi-lepton signals of 2HDMs can arise from a variety of sources, including Standard Model-like production of the CP-even scalars, $h$ and $H$, through gluon-fusion with $h,H\to Z{Z}^{(\ast )}$, or associated production with vector bosons or top quarks, with $h,H\to W{W}^{(\ast )},Z{Z}^{(\ast )},\tau \tau$. Additional sources include gluon-fusion production of the heavy CP-even scalar with decays through the light CP-even scalar, the CP-odd scalar, $A$, or the charged scalar, $H^{\pm }$, such as $H\to hh$, $H\to AA$, $H\to H^{+}{H}^{-}$, $H\to ZA$, with $A\to Zh,\tau \tau$, $H^{\pm }\to Wh$, and $h\to W{W}^{\ast },Z{Z}^{\ast },\tau \tau$. Altogether, the combined multi-lepton signal may greatly exceed that of the Standard Model Higgs boson and provides a sensitive probe of extended Higgs sectors. As a proof of principle, we use a factorized mapping procedure between model parameters and signatures to determine multi-lepton sensitivities in four different flavor conserving 2HDM parameter spaces by simulating the acceptance times efficiency in 20 exclusive multi-lepton channels for 222 independent production and decay topologies that arise for four benchmark 2HDM spectra within each parameter space. A comparison of these sensitivities with the results of a multi-lepton search conducted by the CMS collaboration using 5 fb${}^{-1}$ of data collected from 7 TeV $pp$ collisions yields new limits in regions of 2HDM parameter space that have not previously been covered by other types of direct experimental searches.

39 pages, 11 tables, 11 figures

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• Search for the Standard Model Higgs boson in the diphoton decay channel with 4.9 fb-1 of pp collisions at sqrt(s) = 7 TeV with ATLAS
• Search for the standard model Higgs boson in the decay channel H to ZZ to 4 leptons in pp collisions at sqrt(s) = 7 TeV
• Search for anomalous production of multilepton events in pp collisions at sqrt(s) = 7 TeV
• Exclusive Signals of an Extended Higgs Sector

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