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Multi-lepton signals of multiple Higgs bosons

2013; Springer Nature; Volume: 2013; Issue: 2 Linguagem: Inglês

10.1007/jhep02(2013)033

1127-2236

Nathaniel Craig, Jared A. Evans, Richard Gray, Can Kılıç, Michael Park, S. Somalwar, Scott Thomas,

Neutrino Physics Research

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 → ZZ (∗), or associated production with vector bosons or top quarks, with h, H → WW (∗) , ZZ (∗) , ττ. Additional sources include gluon-fusion production of the heavy CP-even scalar with cascade decays through the light CP-even scalar, the CP-odd scalar, A, or the charged scalar, H ±, such as H → hh, H → AA, H → H + H −, H → ZA, with A → Zh, ττ, H ± → Wh, and h → WW ∗ , ZZ ∗ , ττ. 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 over a wide range of parameters. 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 some regions of 2HDM parameter space that have not previously been covered by other types of direct experimental searches.