0000000000216817

AUTHOR

N. Molokanova

showing 3 related works from this author

Search for heavy neutrinos at the NA48/2 and NA62 experiments at CERN

2018

© The Authors, published by EDP Sciences. The NA48/2 experiment at CERN has collected large samples of charged kaons decaying into a pion and two muons for the search of heavy nuetrinos. In addition, its successor NA62 has set new limits on the rate of charged kaon decay into a heavy neutral lepton (HNL) and a lepton, with = e, µ, using the data collected in 2007 and 2015. New limits on heavy neutrinos from kaon decays into pions, muons and positrons are presented in this report.

PhysicsParticle physicsLarge Hadron ColliderMuonPhysics::Instrumentation and Detectors010308 nuclear & particles physicsPhysicsQC1-999Nuclear TheoryHigh Energy Physics::PhenomenologyHeavy neutrino01 natural sciencesSettore FIS/04 - Fisica Nucleare e SubnuclearePhysics and Astronomy (all)Pion0103 physical sciencesHigh Energy Physics::ExperimentKaon decaysNeutrinoHeavy neutrinoNuclear Experiment010306 general physicsKaon decays Heavy neutrinoParticle Physics - ExperimentLepton
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First observation and study of the K± → π±π0e+e− decay

2018

The NA48/2 experiment at CERN reports the first observation of the K-+/- -> pi(+/-)pi(0)e(+)e(-) decay from an exposure of 1.7 x 10(11) charged kaon decays recorded in 2003-2004. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region, BR(K-+/- -> pi(+/-)pi(0)e(+)e(-)) = (4.24 +/- 0.14) x 10(-6). The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated.

rare decayNuclear and High Energy PhysicsChiral perturbation theoryCP violation; Monte-Carlo; searchAstronomy & AstrophysicsSpace (mathematics)quark mixing01 natural sciencesPartícules (Física nuclear)Charged Kaon decaysPhysics Particles & FieldsCharged Kaon decays quark mixing radiative kaon decay chiral perturbation theoryEconomica0202 Atomic Molecular Nuclear Particle And Plasma PhysicsViolació CP (Física nuclear)MONTE-CARLOSEARCH0103 physical sciencesKaon decaysradiative kaon decay010306 general physicsPhysicsScience & Technology010308 nuclear & particles physicsBranching fractionPhysicsKaon decays Chiral Perturbation TheoryAmbientaleK mesonNuclear & Particles PhysicsChiral Perturbation Theorylcsh:QC1-999fixed target experimentPhysics NuclearPhysical SciencesK meson rare decay fixed target experimentCP violationHigh Energy Physics::ExperimentCP VIOLATIONAtomic physicslcsh:PhysicsPhysics Letters B
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Search for K+→ π+νν¯ at NA62

2018

Flavour physics is one of the most powerful fields for the search of new physics beyond the Standard Model. The kaon sector with the rare decay K+ → π+νν̅ provides one of the cleanest and most promising channels. NA62, a fixed target experiment at the CERN SPS, aims to measure BR (K+ → π+νν̅) with 10% precision to test the Standard Model validity up to an energy scale of hundreds of TeV. NA62 had dedicated data taking for the K+ → π+νν̅ measurement in 2016 and 2017 and will continue in 2018. Here preliminary results on a fraction of 2016 dataset are presented. The analysis of the complete 2016 data sample is expected to achieve the SM sensitivity.

PhysicsParticle physicsLarge Hadron Collider010308 nuclear & particles physicsPhysics beyond the Standard ModelPhysicsQC1-999Flavour Physicsrare Kaon decays01 natural sciencesMeasure (mathematics)Settore FIS/04 - Fisica Nucleare e SubnucleareStandard ModelPhysics and Astronomy (all)0103 physical sciences010306 general physicsFlavour Physics rare Kaon decays
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