Search for charged Higgs bosons using the OPAL detector at LEP

doi:10.1016/0370-2693(96)00029-9

Physics Letters B

Volume 370, Issues 1–2, 7 March 1996, Pages 174-184

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Abstract

A search is described to detect charged Higgs bosons via the process Z⁰ → H⁺H⁻, using data collected by the OPAL detector at LEP which correspond to an integrated luminosity of approximately 110 pb⁻¹. It is assumed that the H⁺ boson decays only to τ⁺ν_τ and c $s$ final states. From the negative outcome of this search a lower bound of 44.1 GeV (95% CL) is derived for the mass of the charged Higgs boson.

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Search for charged Higgs bosons with the OPAL detector at LEP
2003, Nuclear Physics A
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2002, Physics Report
In e⁺e⁻ annihilations at the Z pole near $91 GeV$ center-of-mass energy, the complete results from the general searches for the Higgs boson of the Minimal Standard Model (MSM) and for neutral and charged Higgs bosons of non-minimal Higgs models are reviewed for the four LEP experiments at CERN: ALEPH, DELPHI, L3 and OPAL. The search for Higgs bosons has been made possible by the analysis of their large data sets consisting of a total of about 18 million hadronic Z decays recorded from 1989 to 1995. No indication of a signal was observed in any search channel. Interpretations of the experimental results are given in the MSM and in extensions with an extra Higgs boson singlet and doublet, as well as in the Minimal Supersymmetric extension of the Standard Model (MSSM).
Radiative corrections to e+e- → H+H-: THDM versus MSSM
1999, Nuclear Physics B
One-loop radiative corrections to e⁺e⁻ → H⁺H⁻ are considered at future linear collider energies, in the general type II Two Higgs Doublet Model (THDM) and in the Minimal Supersymmetric Standard Model-like (MSSM) Higgs sector. To make the comparison between THDM and MSSM tractable, we have introduced a quasi-SUSY parameterization which preserves all the tree-level Higgs mass-sum-rules of the MSSM, and involves just 3 free parameters in the Higgs sector (instead of 7 in the general THDM) and comprises the MSSM as a particular case. The model-independent soft photon contribution is isolated and shown to be substantial. Important effects come also from the contribution of the model dependent h⁰H⁺H⁻ and H⁰H⁺H⁻ vertices to the final state. In the MSSM, the contribution of the Higgs sector is moderate (a few percent) while in the THDM and both for small and large tan β important effects (∼ + 30%) can be found.
Leading logarithmic QCD corrections to the B<inf>s</inf> → γγ decays in the two-Higgs doublet model
1998, Nuclear Physics B
We calculate the leading logarithmic QCD corrections to the decay B_s → γγ in the two-Higgs doublet model (2HDM) including O₇-type long-distance effects and estimate the restrictions of the 2HDM parameters, tan β and m_H, using the experimental data of B → X_sγ decay provided by the CLEO Collaboration. A lower bound for the charged Higgs mass m_H as a function of the renormalization scale μ is given for 2HDM model II. We further present the dependencies of the branching ratio Br(B_s → γγ) and the ratio |A⁺|²/|A⁻|² on m_H and tan β logarithmic QCD corrections. The dependence on the renormalization scale is found to be strong for both ratios. An additional uncertainty arises from the variation of the parameters of the bound state model, ( $m_{b}, Λ_{s}$ ). We see that to look for charged Higgs effects the measurement of the branching ratio Br(B_s → γγ) is promising.
Searches for Higgs Bosons at LEP2
1998, Nuclear Physics B - Proceedings Supplements
After five years of running at centre-of-mass energies close to the Z⁰ resonance, the energy of the e⁺e⁻ collider LEP has been raised in successive steps to 172 GeV. This increase in energy opens a new kinematic domain for particle searches. We describe the searches for Higgs bosons performed by the four LEP experiments, ALEPH, DELPHI, L3 and OPAL, using the data collected at the upgraded energies. The prospects for Higgs searches at LEP2 in the forthcoming years are also discussed.
Search for charged Higgs bosons in e+e- collisions at centre-of-mass energies from 130 to 172 GeV
1998, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
The data collected at centre-of-mass energies ranging from 130 to 172 GeV by ALEPH at LEP, corresponding to an integrated luminosity of 27.5 pb⁻¹, are analysed in a search for pair-produced charged Higgs bosons H^±. Three analyses are employed to select the $τ^{+} ν_{τ} τ^{−} ν ̄_{τ}$ , $c s ̄ τ^{−} ν ̄_{τ}$ and $c s ̄ s c ̄$ final states. No evidence for a signal is found. Mass limits are set as a function of the branching fraction $B (τν)$ for H^±→τν. Charged Higgs bosons with masses below 52 GeV/c² are excluded at 95% C.L. independently of $B (τν)$ , thus significantly improving on existing limits.

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¹: Also at TRIUMF, Vancouver, Canada V6T 2A3.

²: Royal Society University Research Fellow.

³: Institute of Nuclear Research, Debrecen, Hungary.

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Physics Letters B

Abstract

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Cited by (21)

Search for charged Higgs bosons with the OPAL detector at LEP

Higgs physics at LEP-1

Radiative corrections to e<sup>+</sup>e<sup>-</sup> → H<sup>+</sup>H<sup>-</sup>: THDM versus MSSM

Leading logarithmic QCD corrections to the B<inf>s</inf> → γγ decays in the two-Higgs doublet model

Searches for Higgs Bosons at LEP2

Search for charged Higgs bosons in e<sup>+</sup>e<sup>-</sup> collisions at centre-of-mass energies from 130 to 172 GeV