Search results for "K2K experiment"

showing 3 items of 3 documents

Three-neutrino mixing after the first results from K2K and KamLAND

2003

We analyze the impact of the data on long baseline \nu_\mu disappearance from the K2K experiment and reactor \bar\nu_e disappearance from the KamLAND experiment on the determination of the leptonic three-generation mixing parameters. Performing an up-to-date global analysis of solar, atmospheric, reactor and long baseline neutrino data in the context of three-neutrino oscillations, we determine the presently allowed ranges of masses and mixing and we consistently derive the allowed magnitude of the elements of the leptonic mixing matrix. We also quantify the maximum allowed contribution of \Delta m^2_{21} oscillations to CP-odd and CP-even observables at future long baseline experiments.

Astrofísica nuclearNuclear and High Energy PhysicsParticle physicsSolar neutrinoFOS: Physical sciencesContext (language use)01 natural sciences7. Clean energyPartícules (Física nuclear)Nuclear physicsHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciencesNeutrinsNeutrinos010306 general physicsNeutrino oscillationMixing (physics)Particles (Nuclear physics)Physics010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyObservableHigh Energy Physics - Phenomenology13. Climate actionK2K experimentAstronomiaCP violationNuclear astrophysicsHigh Energy Physics::ExperimentNeutrinoPhysical Review D
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Evidence for Muon Neutrino Oscillation in an Accelerator-Based Experiment

2005

We present results for muon neutrino oscillation in the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment. K2K uses an accelerator-produced muon neutrino beam with a mean energy of 1.3 GeV directed at the Super-Kamiokande detector. We observed the energy dependent disappearance of muon neutrino, which we presume have oscillated to tau neutrino. The probability that we would observe these results if there is no neutrino oscillation is 0.0050% (4.0 sigma).

Particle physicsPhysics::Instrumentation and DetectorsAstrophysics::High Energy Astrophysical PhenomenaGeneral Physics and AstronomyFOS: Physical sciencesddc:500.201 natural sciences7. Clean energyHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)0103 physical sciencesMuon neutrino010306 general physicsNeutrino oscillationPhysicsTamura Norio010308 nuclear & particles physicsOscillationDetectorHigh Energy Physics::PhenomenologySigmaFísicaSolar neutrino problemK2K experimentPhysics::Accelerator Physics田村 詔生High Energy Physics::ExperimentBeam (structure)
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Measurement of neutrino oscillation by the K2K experiment

2006

We present measurements of nu_mu disappearance in K2K, the KEK to Kamioka long-baseline neutrino oscillation experiment. One hundred and twelve beam-originated neutrino events are observed in the fiducial volume of Super-Kamiokande with an expectation of 158.1^{+9.2}_{-8.6} events without oscillation. A distortion of the energy spectrum is also seen in 58 single-ring muon-like events with reconstructed energies. The probability that the observations are explained by the expectation for no neutrino oscillation is 0.0015% (4.3sigma). In a two flavor oscillation scenario, the allowed Delta m^2 region at sin^2(2theta) is between 1.9 and 3.5 x 10^{-3} eV^2 at the 90% C.L. with a best-fit value o…

PhysicsNuclear and High Energy PhysicsParticle physicsTamura Norio010308 nuclear & particles physicsOscillationT2K experimentFOS: Physical sciencesFísicaElementary particle7. Clean energy01 natural sciencesHigh Energy Physics - ExperimentNuclear physicsMassless particleHigh Energy Physics - Experiment (hep-ex)K2K experiment0103 physical sciences田村 詔生Neutrino010306 general physicsNeutrino oscillationLeptonPhysical Review D
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