Search results for "lepton universality"

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Precision measurement of the ratio of the charged kaon leptonic decay rates

2013

A precision measurement of the ratio RK of the rates of kaon leptonic decays K+- --> e nu and K+- --> mu nu with the full data sample collected by the NA62 experiment at CERN in 2007-2008 is reported. The result, obtained by analysing ~150000 reconstructed K+- --> e nu candidates with 11% background contamination, is RK = (2.488+-0.010)*10^{-5}, in agreement with the Standard Model expectation.

Nuclear and High Energy PhysicsParticle physicsstandard modelFOS: Physical sciencesNA62 experiment01 natural sciencesHigh Energy Physics - ExperimentStandard ModelNuclear physicsHigh Energy Physics - Experiment (hep-ex)lepton universalityRare kaon decays; chiral perturbation theoryLepton universality; Charged Kaon Decay0103 physical scienceskaon decays leptonic decays lepton universality010306 general physicschiral perturbation theoryPhysicsleptonic decaysLarge Hadron Colliderkaon decays010308 nuclear & particles physicscharged kaon3. Good healthCharged Kaon DecayRare kaon decaysKaon rare decaysFull dataKaon rare decays; branching ratio; charged kaon; leptonic decays; standard modelbranching ratioParticle Physics - ExperimentLepton universality
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