Search results for " K meson decay"

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Searches for lepton number violating $K^+$ decays

2019

The NA62 experiment at CERN reports a search for the lepton number violating decays K+ -> pi(-)e(+)e(+) and K+ -> pi(-)mu(+)mu(+) using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2 x 10(-10) and 4.2 x 10(-11) are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.

branching ratio: upper limitK+: rare decayNA62 experiment01 natural sciencesNA62Settore FIS/04 - Fisica Nucleare e SubnucleareHigh Energy Physics - Experimentelectron: pair productionHigh Energy Physics - Experiment (hep-ex)EconomicaK+: branching ratio[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]K meson decayPhysicsLarge Hadron ColliderElectroweak interactionlcsh:QC1-999muon: pair productionlepton number violationK+: semileptonic decayK+: secondary beamParticle Physics - ExperimentNuclear and High Energy PhysicsParticle physicsCERN LabS010.46FOS: Physical scienceskaonsS010:Desig=46K+ --> pi- 2muon+Partícules (Física nuclear)PE2_2Violació CP (Física nuclear)0103 physical sciencesKaon decayslepton number violation K meson K meson decay010306 general physicslepton number: violationKaon decays Lepton Number Violationhep-ex010308 nuclear & particles physicsS010:Desig=19CERN SPSK mesonLepton numberK+ --> pi- electron positronKaon Physics; Lepton Flavour Violation; NA62S010.19lcsh:Physicsexperimental results
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