Search for Invisibly Decaying Higgs Bosons with Large Decay Width Using the OPAL Detector at LEP
arXiv:hep-ex/0610056 · doi:10.1140/epjc/s10052-006-0170-x
Abstract
This 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.
30 pages, 10 figures, Submitted to Eur. Phys. J
References in corpus (19)
- Search for the Standard Model Higgs Boson at LEP
- Confidence Level Computation for Combining Searches with Small Statistics
- The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
- Graviscalars from higher-dimensional metrics and curvature-Higgs mixing
- Hadronic photon-photon interactions at high energies
- Decay-mode independent searches for new scalar bosons with the OPAL detector at LEP
- grc4f v1.1: a Four-fermion Event Generator for e+e- Collisions
- grc4f v1.0: a Four-fermion Event Generator for e+e- Collisions
- Influence of strongly coupled, hidden scalars on Higgs signals
- Search for the Standard Model Higgs Boson with the OPAL Detector at LEP
- Four-Fermion Production in Electron-Positron Collisions
- The minimal non-minimal standard model
- Search for Higgs Bosons in e+e- Collisions at 183 GeV
- Study of Z Pair Production and Anomalous Couplings in e+e- Collisions at sqrt(s) between 190 GeV and 209 GeV
- Flavour Independent hA Search and Two Higgs Doublet Model Interpretation of Neutral Higgs Boson Searches at LEP
- Measurement of the W Mass and Width in e+e- Collisions at 183 GeV
- Z boson pair production in e+e- collisions at sqrt(s) = 183 and 189 GeV
- Search for an invisibly decaying Higgs boson in e^+e^- collisions at \sqrt{s} = 183 - 189 GeV
- The stealthy Higgs model at future Linear Colliders