0000000000326450

AUTHOR

J. A M A Buytaert

showing 2 related works from this author

A search for neutral higgs particles in Z$^0$ decays

1992

Abstract The search in DELPHI data for neutral Higgs bosons is described. No candidate for the Standard Model Higgs is seen in Z0 decays to H 0 ν ν , H 0 μ + μ − or H0τ+τ− after selections that proved efficient for finding simulated H0. One remaining candidate for Z0 → H0e+e− is consistent with background. Together with our earlier studies, these results restrict the H0 mass to be above 38 GeV/c2 at the 95% confidence level. No signal is found for decays of Minimal Supersymmetric Standard Model neutral Higgs bosons to τ+τ−. Limits are obtained for their decays to produce four jets.

Nuclear and High Energy PhysicsParticle physicsElectron–positron annihilationSTANDARD MODEL01 natural sciencesLower limitStandard ModelNuclear physicsPHYSICSLIMITS0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]010306 general physicsBosonPhysicsMASS SCALAR BOSONLIGHT SCALAR010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyZ0 DECAYE+E COLLISIONSSupersymmetrySUPERSYMMETRIC MODELSLEPNUCLEAR DECAYHiggs bosonHigh Energy Physics::ExperimentFísica nuclearMASS SCALAR BOSON; Z0 DECAY; SUPERSYMMETRIC MODELS; STANDARD MODEL; E+E COLLISIONS; NUCLEAR DECAY; LIGHT SCALAR; LIMITS; LEP; PHYSICSParticle Physics - ExperimentMinimal Supersymmetric Standard Model
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Determination of 55-155-155-1in second order QCD from hadronic Z decays

1992

Distributions of event shape variables obtained from 120600 hadronic Z decays measured with the DELPHI detector are compared to the predictions of QCD based event generators. Values of the strong coupling constant αs are derived as a function of the renormalization scale from a quantitative analysis of eight hadronic distributions. The final result, αs(MZ), is based on second order perturbation theory and uses two hadronization corrections, one computed with a parton shower model and the other with a QCD matrix element model. © 1992 Springer-Verlag.

Quantum chromodynamicsPhysicsParticle physicsPhysics and Astronomy (miscellaneous)010308 nuclear & particles physicsElectron–positron annihilationHadronHigh Energy Physics::Phenomenology01 natural sciencesHadronizationRenormalization0103 physical sciencesHigh Energy Physics::ExperimentPerturbation theory (quantum mechanics)010306 general physicsParton showerEngineering (miscellaneous)Event (particle physics)Zeitschrift für Physik C Particles and Fields
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