Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-04-15
Phys.Lett. B571 (2003) 184-192
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 2 Figures, LateX; minor revision; few references added; version to appear in PLB
Scientific paper
10.1016/j.physletb.2003.06.066
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$\sigma$ level for $M_H = 120$(160) GeV respectively, assuming an accumulated luminosity of L=100 fb$^{-1}$.
Godbole Rohini M.
Guchait Manoranjan
Mazumdar Kajari
Moretti Sébastien
Roy David P.
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