0000000001091477

AUTHOR

I. Popov

showing 2 related works from this author

Test of lepton flavour universality in K+→ℓ+ν decays

2011

Abstract A precision test of lepton flavour universality has been performed by measuring the ratio R K of kaon leptonic decay rates K + → e + ν and K + → μ + ν in a sample of 59 813 reconstructed K + → e + ν candidates with ( 8.71 ± 0.24 ) % background contamination. The result R K = ( 2.487 ± 0.013 ) × 10 − 5 is in agreement with the Standard Model expectation.

Nuclear physicsPhysicsNuclear and High Energy PhysicsParticle physicsFlavourWidth ratioUniversality (dynamical systems)LeptonPhysics Letters B
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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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