0000000000511084

AUTHOR

Ha Tanaka

showing 3 related works from this author

Rates, polarizations, and asymmetries in charmless vector-vector B meson decays

2003

With a sample of approximately 89 million BBbar pairs collected with the BABAR detector, we perform a search for B meson decays into pairs of charmless vector mesons (phi, rho, and K*). We measure the branching fractions, determine the degree of longitudinal polarization, and search for CP violation asymmetries in the processes B->phiK*+, B->phiK*0, B->rho0K*+, and B->rho0rho+. We also set an upper limit on the branching fraction for the decay B->rho0rho0.

Particle physicsMesonBABARElectron–positron annihilationHadronFOS: Physical sciencesGeneral Physics and AstronomyElementary particleResonancePARTICLE PHYSICS; PEP2; BABAR01 natural sciencesNOHigh Energy Physics - ExperimentHigh energy physicHigh Energy Physics - Experiment (hep-ex)Particle decayElectromagnetic calorimeterPolarizationProbability density function0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]PEP2B mesonDecay dynamic010306 general physicsPhysicsCalorimeter010308 nuclear & particles physicsBranching fractionCP-ASYMMETRIES VIOLATION SEARCH B->VVColliding beam acceleratorComputer simulationDecay rateMonte Carlo methodCrystallographyPARTICLE PHYSICSCP violationHigh Energy Physics::ExperimentParticle detectorProton
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Measurement of the intrinsic electron neutrino component in the T2K neutrino beam with the ND280 detector

2014

The T2K experiment has reported the first observation of the appearance of electron neutrinos in a muon neutrino beam. The main and irreducible background to the appearance signal comes from the presence in the neutrino beam of a small intrinsic component of electron neutrinos originating from muon and kaon decays. In T2K, this component is expected to represent 1.2% of the total neutrino flux. A measurement of this component using the near detector (ND280), located 280 m from the target, is presented. The charged current interactions of electron neutrinos are selected by combining the particle identification capabilities of both the time projection chambers and electromagnetic calorimeters…

Nuclear and High Energy PhysicsParticle physicsPhysics::Instrumentation and DetectorsSolar neutrinoAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciences01 natural sciences7. Clean energyHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]010306 general physicsNeutrino oscillationPhysics010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyT2K experimentFísicaSolar neutrino problem3. Good healthCosmic neutrino backgroundNeutrino detectorMeasurements of neutrino speedHigh Energy Physics::ExperimentNeutrino
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Measurement of Neutrino Oscillation Parameters from Muon Neutrino Disappearance with an Off-Axis Beam

2013

The T2K Collaboration reports a precision measurement of muon neutrino disappearance with an off-axis neutrino beam with a peak energy of 0.6 GeV. Near detector measurements are used to constrain the neutrino flux and cross section parameters. The Super-Kamiokande far detector, which is 295 km downstream of the neutrino production target, collected data corresponding to 3.01 x 10(20) protons on target. In the absence of neutrino oscillations, 205 +/- 17 (syst) events are expected to be detected while only 58 muon neutrino event candidates are observed. A fit to the neutrino rate and energy spectrum, assuming three neutrino flavors and normal mass hierarchy yields a best-fit mixing angle sin…

Particle physicsPhysics::Instrumentation and DetectorsSolar neutrinoAstrophysics::High Energy Astrophysical PhenomenaGeneral Physics and AstronomyFluxFOS: Physical sciencesddc:500.201 natural sciences7. Clean energyHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Muon neutrino010306 general physicsNeutrino oscillationPhysics010308 nuclear & particles physics4. EducationHigh Energy Physics::PhenomenologyDetectorSolar neutrino problemNeutrino detectorMeasurements of neutrino speedFísica nuclearHigh Energy Physics::ExperimentNeutrino
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