0000000000280940

AUTHOR

E. Matsinos

showing 3 related works from this author

Search for neutral Higgs bosons from supersymmetry in Z decays

1990

The light scalar Higgs boson h and the pseudoscalar Higgs boson A of the minimal supersymmetric standard model have been searched for in the processes e+e−→hff and e+e−→hA using data collected by ALEPH at the LEP e+e− collider, with center of mass energies at and near the Z peak. Using a variety of signatures adapted to various mass ranges for h and A, we have excluded a large domain in the parameter space. For large values of ν2ν1, the ratio of the vacuum expectation values of the two Higgs fields, the whole range from 0 to 38.8 GeV is excluded for Mh and MA at 95% CL.

PhysicsNuclear and High Energy PhysicsParticle physicsHigh Energy Physics::PhenomenologyElementary particleSupersymmetrylcsh:QC1-999Standard ModelPseudoscalarsymbols.namesakeHiggs bosonsymbolsHigh Energy Physics::ExperimentHiggs mechanismParticle Physics - Experimentlcsh:PhysicsMinimal Supersymmetric Standard ModelBosonPhysics Letters B
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Search for excited leptons in Z0 decay

1990

Due to the severity of system-wide power outages, though their probability of occurrence is slight, regulatory authorities require that a system restoration plan be drawn up and kept up to date at all times. The power outage that affected northeastern North America in 2003 proved the need for such a requirement. The particular structure of Hydro-Quebec's power system requires the use of a highly specific system restoration procedure. The daily preparation of the system restoration plan is based on a strategy whose application requires that a restoration sequence be drawn up that uses available equipment, the electrical behavior of which has been validated using appropriate studies. Over the…

PhysicsNuclear and High Energy PhysicsParticle physicsOperations researchbusiness.industryKnowledge engineeringPlan (drawing)Asset (computer security)Electric power systemSoftwareKnowledge baseCase-based reasoningUnavailabilitybusinessParticle Physics - Experiment
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Search for decays of the Z0 into a photon and a pseudoscalar meson

1990

Abstract A search is reported for decays of the Z 0 into π 0 γ , ηγ and η ′ (958) γ in e + e − collisions using data collected during a scan around the Z 0 mass. In order to search for π 0 γ final states, in which the two photons from the π 0 decay are unresolved, the production of pairs of high-energy electromagnetic clusters is studied. The data are compared with the expectations from the pure QED process e + e − → γγ , and a 95% confidence level upper limit on the branching ratio of the Z 0 into π 0 γ of 4.9 × 10 −4 is derived. For η′γ, the decay modes of the mesons that contain two charged particles are largely free from QED background. These modes are used to place upper limits of 4.6 …

PhysicsNuclear physicsNuclear and High Energy PhysicsParticle physicsPhotonSecondary educationMesonBranching fractionElectron–positron annihilationPseudoscalar mesonCharged particleParticle Physics - ExperimentResearch method
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