Search for Invisibly Decaying Higgs Bosons with Large Decay Width Using the OPAL Detector at LEP

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dc.creatorThe OPAL collaboration
dc.date2006-10-18
dc.date.accessioned2026-07-07T11:43:15Z
dc.date.available2026-07-07T11:43:15Z
dc.descriptionThis paper describes a topological search for an invisibly decaying Higgs boson,H, produced via the Bjorken process (e+e- -> HZ). The analysis is based on data recorded using the OPAL detector at LEP at centre-of-mass energies from 183 to 209 GeV corresponding to a total integrated luminosity of 629pb-1. In the analysis only hadronic decays of the Z boson are considered. A scan over Higgs boson masses from 1 to 120 GeV and decay widths from 1 to 3000 GeV revealed no indication for a signal in the data. From a likelihood ratio of expected signal and Standard Model background we determine upper limits on cross-section times branching ratio to an invisible final state. For moderate Higgs boson decay widths, these range from about 0.07pb Mh = 60GeV) to 0.57pb (Mh = 114GeV). For decay widths above 200GeV the upper limits are of the order of 0.15pb. The results can be interpreted in general scenarios predicting a large invisible decay width of the Higgs boson. As an example we interpret the results in the so-called stealthy Higgs scenario. The limits from this analysis exclude a large part of the parameter range of this scenario experimentally accessible at LEP2.
dc.description30 pages, 10 figures, Submitted to Eur. Phys. J
dc.identifierhttps://arxiv.org/abs/hep-ex/0610056
dc.identifierhttp://arxiv.org/abs/hep-ex/0610056
dc.identifierEur.Phys.J.C49:457-472,2007
dc.identifierdoi:10.1140/epjc/s10052-006-0170-x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/201172
dc.subjectHigh Energy Physics - Experiment
dc.titleSearch for Invisibly Decaying Higgs Bosons with Large Decay Width Using the OPAL Detector at LEP
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