2003/04/30 by R. M. Godbole, Rohini M. Godbole, Monoranjan Guchait +6 · 10 citations
Physics and Astronomy · #Boson #Branching fraction #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Gauge boson #Gauge theory #Geometry #Higgs boson #Large Hadron Collider #Lepton #Neutrino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Scalar (mathematics) #hep-ph
paper · pdf · doi:10.1016/j.physletb.2003.06.066
published as Phys.Lett. B571 (2003) 184-192 · 12 pages, 2 Figures, LateX; minor revision; few references added; version to appear in PLB
arxiv created 2003/07/15 · openalex publication_date 2003/09/12 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 ET' 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 ET' channel. By exploiting this second signature, we show that invisible branching ratios of Higgs bosons, BRinv, larger than ∼ 0.42(0.70) can be probed at 5σ level for MH = 120(160) GeV respectively, assuming an accumulated luminosity of L=100 fb-1.