Search for an Invisibly-Decaying Higgs Boson at LEP

Abstract

A search for a Higgs boson produced in e^+e^- collisions in association with a Z boson and decaying into invisible particles is performed. Data collected at LEP with the L3 detector at centre-of-mass energies from 189 GeV to 209 GeV are used, corresponding to an integrated luminosity of 0.63/fb. Events with hadrons, electrons or muons with visible masses compatible with a Z boson and missing energy and momentum are selected. They are consistent with the Standard Model expectations. A lower limit of 112.3 GeV is set at 95% confidence level on the mass of the invisibly-decaying Higgs boson in the hypothesis that its production cross section equals that of the Standard Model Higgs boson. Relaxing this hypothesis, upper limits on the production cross section are derived.

References in corpus (17)

• Search for the Standard Model Higgs Boson at LEP
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• Search for Anomalous Couplings in the Higgs Sector at LEP
• Flavour independent search for Higgs bosons decaying into hadronic final states in e+e- collisions
• Flavour Independent Search for Neutral Higgs Bosons at LEP
• Search for Neutral Higgs Bosons of the Minimal Supersymmetric Standard Model in e+e- Interactions at sqrt(s) up to 209 GeV
• A flavour-independent Higgs boson search in e+e- collisions at sqrt(s) up to 209GeV
• Search for an invisibly decaying Higgs boson in e^+e^- collisions at \sqrt{s} = 183 - 189 GeV

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• A New Two Higgs Doublet Model
• Neutrino Masses and Absence of Flavor Changing Interactions in the 2HDM from Gauge Principles
• Visible Cascade Higgs Decays to Four Photons at Hadron Colliders
• The minimal non-minimal standard model
• Constraining Higgs boson effective couplings at electron-positron colliders
• ${\rm Y}$ Decays into Light Scalar Dark Matter
• Dark Two Higgs Doublet Model
• Higgs-boson visible and invisible constraints on hidden sectors
• Collider Constraints and Prospects of a Scalar Singlet Extension to Higgs Portal Dark Matter
• Dark Higgs Models at the 7 TeV LHC
• Searching for Elusive Dark Sectors with Terrestrial and Celestial Observations
• Search for invisibly decaying Higgs bosons in e+e- -> Zoho production at sqrt(s) = 183 - 209 GeV
• Heavy MSSM Higgs production at the LHC and decays to WW,ZZ at higher orders
• Weinberg's Higgs portal confronting recent LUX and LHC results together with upper limits on B^+ and K^+ decay into invisibles
• $\nu$ Electroweak Baryogenesis: The Scalar Singlet Strikes Back
• The depleted Higgs boson: searches for universal coupling suppression, invisible decays, and mixed-in scalars
• Characterizing simplified models for heavy Higgs decays to supersymmetric particles
• Higgs boson searches in CP-conserving and CP-violating MSSM scenarios with the DELPHI detector
• Light dark matter around 100 GeV from the inert doublet model