Search results for "SUPERLIGHT GRAVITINO"

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Photon events with missing energy at root s=183 to 189 GeV

2000

The production of single photons has been studied in the reaction e+e- -> gamma + invisible particles at centre-of-mass energies of 183 GeV and 189 GeV. A previously published analysis of events with multi-photon final states accompanied by missing energy has been updated with 189 GeV data. The data were collected with the DELPHI detector and correspond to integrated luminosities of about 51 pb^{-1} and 158 pb^{-1} at the two energies. The number of light neutrino families is measured to be 2.84 +/- 0.15(stat) +/- 0.14(syst). The absence of an excess of events beyond that expected from Standard Model processes is used to set limits on new physics as described by supersymmetric and compos…

NEUTRALINOSParticle physicsDIMENSIONSPhotonPhysics and Astronomy (miscellaneous)Physics beyond the Standard ModelAstrophysics::High Energy Astrophysical PhenomenaSTANDARD MODELFOS: Physical sciencesScale (descriptive set theory)7. Clean energy01 natural sciencesPartícules (Física nuclear)Standard ModelHigh Energy Physics - ExperimentGravitationHigh Energy Physics - Experiment (hep-ex)E(+)E(-) COLLISIONSSIGNALSSEARCH0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]010306 general physicsNuclear ExperimentEngineering (miscellaneous)DELPHIPhysicsMissing energy010308 nuclear & particles physicsSUPERLIGHT GRAVITINOLEPLARGE ELECTRON POSITRON COLLIDERSINGLE-PHOTONCOLLIDERSPARTICLE PHYSICS; LARGE ELECTRON POSITRON COLLIDER; DELPHIPARTICLE PHYSICSProduction (computer science)Física nuclearHigh Energy Physics::ExperimentNeutrinoE(+)E(-) COLLISIONS; SUPERLIGHT GRAVITINO; STANDARD MODEL; SINGLE-PHOTON; COLLIDERS; SEARCH; LEP; NEUTRALINOS; DIMENSIONS; SIGNALSParticle Physics - Experiment
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