Search for a low mass CP-odd Higgs boson in e+e- collisions with the OPAL detector at LEP2

Abstract

We have analysed the data collected by OPAL at centre-of-mass energies between 189 and 209 GeV searching for Higgs boson candidates from the process e+e- -> h0Z0 followed by the decay of h0 -> A0A0 where A0 is the CP-odd Higgs boson. The search is done in the region where the A0 mass, mA, is below the production threshold for bbbar, and the CP-even Higgs boson mass mh is within the range 45-86 GeV/c^2. In this kinematic range, the decay of h0 -> A0A0 may be dominant and previous Higgs boson searches have very small sensitivities. This search can be interpreted within any model that predicts the existence of at least one scalar and one pseudoscalar Higgs boson. No excess of events is observed above the expected Standard Model backgrounds. Model-independent limits on the cross-section for the process e+e- -> h0Z0 are derived assuming 100% decays of the h0 into A0A0 and 100% decays of the A0A0 into each of the following final states: ccbarccbar, gggg, tau+tau-tau+tau-, ccbargg ggtau+tau- and ccbartau+tau-. The results are also interpreted in the CP-conserving no-mixing MSSM scenario, where the region 45 <= mh <= 85 GeV/c^2 and 2<= mA <= 9.5 GeV/c^2 is excluded.

26 pages, 8 figures, Submitted to Eur. Phys. J.C

References in corpus (3)

• Decay-mode independent searches for new scalar bosons with the OPAL detector at LEP
• Suggestions for Improved Benchmark Scenarios for Higgs-Boson Searches at LEP2
• Four-Fermion Production in Electron-Positron Collisions

Cited by in corpus (37)

• The Next-to-Minimal Supersymmetric Standard Model
• Search for Neutral MSSM Higgs Bosons at LEP
• The Next-to-Minimal Supersymmetric extension of the Standard Model reviewed
• Exotic Decays of the 125 GeV Higgs Boson
• Escaping the Large Fine Tuning and Little Hierarchy Problems in the Next to Minimal Supersymmetric Model and h-> aa Decays
• Light Neutralino Dark Matter in the NMSSM
• Nonstandard Higgs Boson Decays
• Higgs Sector in Extensions of the MSSM
• The Hunt for New Physics at the Large Hadron Collider
• Physics searches at the LHC
• Naturalness and Higgs Decays in the MSSM with a Singlet
• A search for pair production of new light bosons decaying into muons
• Search for neutral Higgs bosons decaying into four taus at LEP2
• Lepton-Specific Two-Higgs Doublet Model: Experimental Constraints and Implication on Higgs Phenomenology
• Search for a non-standard-model Higgs boson decaying to a pair of new light bosons in four-muon final states
• Visible Cascade Higgs Decays to Four Photons at Hadron Colliders
• A search for pair production of new light bosons decaying into muons in proton-proton collisions at 13 TeV
• Discovering the Higgs with Low Mass Muon Pairs
• LHC discovery potential of the lightest NMSSM Higgs in the h1 -> a1 a1 -> 4 muons channel
• Search for a very light NMSSM Higgs boson produced in decays of the 125 GeV scalar boson and decaying into tau leptons in pp collisions at sqrt(s) = 8 TeV
• The Higgs sector of the munuSSM and collider physics
• Probing the $\mu \nu$SSM with light scalars, pseudoscalars and neutralinos from the decay of a SM-like Higgs boson at the LHC
• Unburied Higgs
• Flavour Independent hA Search and Two Higgs Doublet Model Interpretation of Neutral Higgs Boson Searches at LEP
• Rare Z-decay into light CP-odd Higgs bosons: a comparative study in different new physics models
• Detection prospects of light NMSSM Higgs pseudoscalar via cascades of heavier scalars from vector boson fusion and Higgs-strahlung
• Search for resonances in the mass spectrum of muon pairs produced in association with b quark jets in proton-proton collisions at $\sqrt{s}=$ 8 and 13 TeV
• Buried Higgs
• SUSY Digs up a Buried Higgs
• The Platinum Channel: Higgs Decays to as many as 8 Leptons
• Hunting physics beyond the standard model with unusual $W^{\pm }$ and $Z$ decays
• Charming Higgs
• Natural h -> 4g in Supersymmetric Models and R-Hadrons at the LHC
• Dipole moments of charged leptons in the THDM-III with Textures
• Effects of fermionic singlet neutrinos on high- and low-energy observables
• Model-independent search for pair production of new bosons decaying into muons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Exotic Higgs Decays to Four Taus at Future Electron-Positron Colliders