92 Result(s)
within
D. J. Miller
Elementary Particles, Quantum Field Theory
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Article
Open AccessJet substructure and probes of CP violation in Vh production
We analyse the hVV (V = W, Z) vertex in a model independent way using Vh production. To that end, we consider possible corrections to the Standard Model Higgs Lagrangian, in the form of higher dimensional operato...
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Article
Open AccessSupersymmetric SO(10) grand unification at the LHC and beyond
We study models of supersymmetric grand unification based on the SO(10) gauge group. We investigate scenarios of non-universal gaugino masses including models containing a mixture of two representations of hid...
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Article
Supersymmetric SU(5) grand unification for a post Higgs boson era
We investigate models of supersymmetric grand unification based on the gauge group SU(5). We consider models with non-universal gaugino masses and confront them with low energy constraints, including the Higgs...
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Article
Open AccessSearch for charged Higgs bosons in e+e− collisions at \(\sqrt{s}=189\mbox{--}209\ \mbox{GeV}\)
A search is made for charged Higgs bosons predicted by Two-Higgs-Doublet extensions of the Standard Model (2HDM) using electron-positron collision data collected by the OPAL experiment at
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Article
Open AccessDetermination of α S using OPAL hadronic event shapes at \(\sqrt{s} = 91\mbox{--}209~\mathrm{GeV}\) and resummed NNLO calculations
Hadronic event shape distributions from e+e− annihilation measured by the OPAL experiment at centre-of-mass energies between 91 GeV and 209 GeV are used to determine the strong coupling α
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Article
Open AccessΣ−-antihyperon correlations in Z0 decay and investigation of the baryon production mechanism
Data collected around \(\sqrt{s}=91\) GeV by the OPAL experiment at the LEP e+e− collider are used to study the mechanism of ba...
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Article
Pre- and Post-Selected Ensembles and Time-Symmetry in Quantum Mechanics
It has recently been argued (Shimony, Erkenntnis 45:337, 1997) that time-symmetry does not hold for pre- and post-selected ensembles in quantum mechanics. That conclusion depends on what is meant by “time-symmetr...
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Article
Open AccessMeasurement of αs with radiative hadronic events
Hadronic final states with a hard isolated photon are studied using data taken at centre-of-mass energies around the mass of the Z boson with the OPAL detector at LEP. The strong coupling αs is extracted by compa...
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Article
Measurement of the e+e-→W+W- cross section and W decay branching fractions at LEP
From a total data sample of 701.1 pb-1 recorded with e+e- centre-of-mass energies of \(\sqrt{s} =\) 161–209 GeV with the...
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Article
Bose–Einstein study of position–momentum correlations of charged pions in hadronic Z0 decays
A study of Bose–Einstein correlations in pairs of identically charged pions produced in e+e- annihilations at the Z0 peak has been performed for the first time assuming a non-static emitting source. The results a...
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Article
Search for invisibly decaying Higgs bosons with large decay width using the OPAL detector at LEP
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-m...
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Article
Search for neutral MSSM Higgs bosons at LEP
The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for the neutral Higgs bosons which are predicted by the Minimal Supersymmetric standard model (MSSM). The data of the four collaborations ...
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Article
Measurement of the strong coupling αS from four-jet observables in e+e- annihilation
Data from e+e- annihilation into hadrons at centre-of-mass energies between 91 GeV and 209 GeV collected with the OPAL detector at LEP, are used to study the four-jet rate as a function of the Durham algorithm re...
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Article
Supersymmetry parameter analysis: SPA convention and project
High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is needed when higher-order corr...
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Article
Pair production of smuons and selectrons near threshold in \(e^+e^-\) and \(e^-e^-\) collisions
Non-zero width and Coulomb rescattering effects are analyzed for the pair production of smuons and selectrons near the thresholds in \(e^+e^-\) and \(e^-e^-\) ...
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Article
Can the trilinear Higgs self-coupling be measured at future linear colliders?
We assess the possibility of measuring the trilinear self-coupling of the Standard Model Higgs boson at future electron-positron linear colliders with centre-of-mass energies between 500 and 1500 GeV. We cons...
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Article
Determination of the production rate of D*0 mesons and of the ratio V/(V+P) in \(Z^0 \to c\bar c\) decays
In e+e2212 collisions at centre-of-mass energies around 91 GeV, D*0 mesons have been reconstructed using data collected with the OPAL detector at LEP. The hadronisation fraction has been measured to be f(c→D*0)=0...
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Article
A search for neutral Higgs bosons in the MSSM and models with two scalar field doublets
A search is described for the neutral Higgs bosons h0 and A0 predicted by models with two scalar field doublets and, in particular, the Minimal Supersymmetric Standard Model (MSSM). The search in the Z0h0 and h0A
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Article
Multi-photon final states in e+e− collisions at ∝s =130-172 GeV
The process e+e− →, γγ(γ) is studied using data recorded with the OPAL detector at LEP. The data sample corresponds to a total integrated luminosity of 25.38 pb−1 taken at centre-of-mass energies of 130–172 GeV. ...
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Article
Search for unstable heavy and excited leptons in e+e− collisions at ∝s = 170-172 GeV
We have searched for unstable neutral and charged heavy leptons, N and L±, and for excited states of neutral and charged leptons, ν* e*, μ* and τ*, in e+e− collisions at centre-of-mass energies of 170 and 172 GeV...
