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arXiv · hep-ph/0304137

Search for `invisible' Higgs signals at LHC via Associated Production with Gauge Bosons

R. M. Godbole·M. Guchait·K. Mazumdar·S. Moretti·D. P. Roy
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Abstract

A light Higgs boson with substantial branching ratio into invisible channels can occur in a variety of models with: light neutralinos, spontaneously broken lepton number, radiatively generated neutrino masses, additional singlet scalar(s) and/or right handed neutrinos in the extra dimensions of TeV scale gravity. We study the observability of the WH and ZH modes at LHC with H decaying invisibly, by carrying out a detailed simulation with two event generators HERWIG and PYTHIA and realistic detector simulations (GETJET and CMSJET). We find that the signal with `single lepton plus missing $E_T$' resulting from WH production suffers from a very large background due to the (off-shell) $W^{*}$ production via the Drell-Yan process. In contrast, the ZH mode provides a clean signal in the `dilepton plus missing $E_T$' channel. By exploiting this second signature, we show that invisible branching ratios of Higgs bosons, ${BR}_{inv}$, larger than $\sim 0.42(0.70)$ can be probed at 5$σ$ level for $M_H = 120$(160) GeV respectively, assuming an accumulated luminosity of L=100 fb$^{-1}$.

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R. M. Godbole, M. Guchait, K. Mazumdar, S. Moretti, D. P. Roy. 2003-07-15. Search for `invisible' Higgs signals at LHC via Associated Production with Gauge Bosons. https://doi.org/10.1016/j.physletb.2003.06.066

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