Kaon programme at CERN: recent results

Searches for lepton flavour and lepton number violation in kaon decays by the NA48/2 and NA62 experiments at CERN are presented. A precision measurement of the helicity-suppressed ratio RK of the K --> e nu and K --> mu nu decay rates has been performed using the full data set collected by the...

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Autor principal: Goudzovski, Evgueni
Lenguaje:eng
Publicado: 2011
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.22323/1.134.0181
http://cds.cern.ch/record/1398493
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author Goudzovski, Evgueni
author_facet Goudzovski, Evgueni
author_sort Goudzovski, Evgueni
collection CERN
description Searches for lepton flavour and lepton number violation in kaon decays by the NA48/2 and NA62 experiments at CERN are presented. A precision measurement of the helicity-suppressed ratio RK of the K --> e nu and K --> mu nu decay rates has been performed using the full data set collected by the NA62 collaboration in 2007. The data sample amounted to 145,958 reconstructed K --> e nu candidates with 11.0% background contamination. The result is RK = (2.488 +- 0.010) X 10^{-5}, which is in agreement with the Standard Model expectation. An improved upper limit on the lepton number violating K+- --> pi-+ mu+- mu+- decay rate is also presented.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2011
record_format invenio
spelling cern-13984932023-03-14T18:04:31Zdoi:10.22323/1.134.0181http://cds.cern.ch/record/1398493engGoudzovski, EvgueniKaon programme at CERN: recent resultsParticle Physics - ExperimentSearches for lepton flavour and lepton number violation in kaon decays by the NA48/2 and NA62 experiments at CERN are presented. A precision measurement of the helicity-suppressed ratio RK of the K --> e nu and K --> mu nu decay rates has been performed using the full data set collected by the NA62 collaboration in 2007. The data sample amounted to 145,958 reconstructed K --> e nu candidates with 11.0% background contamination. The result is RK = (2.488 +- 0.010) X 10^{-5}, which is in agreement with the Standard Model expectation. An improved upper limit on the lepton number violating K+- --> pi-+ mu+- mu+- decay rate is also presented.Searches for lepton flavour and lepton number violation in kaon decays by the NA48/2 and NA62 experiments at CERN are presented. A precision measurement of the helicity-suppressed ratio RK of the K --> e nu and K --> mu nu decay rates has been performed using the full data set collected by the NA62 collaboration in 2007. The data sample amounted to 145,958 reconstructed K --> e nu candidates with 11.0% background contamination. The result is RK = (2.488 +- 0.010) X 10^{-5}, which is in agreement with the Standard Model expectation. An improved upper limit on the lepton number violating K+- --> pi-+ mu+- mu+- decay rate is also presented.arXiv:1111.2818POS(EPS-HEP2011)181oai:cds.cern.ch:13984932011-11-14
spellingShingle Particle Physics - Experiment
Goudzovski, Evgueni
Kaon programme at CERN: recent results
title Kaon programme at CERN: recent results
title_full Kaon programme at CERN: recent results
title_fullStr Kaon programme at CERN: recent results
title_full_unstemmed Kaon programme at CERN: recent results
title_short Kaon programme at CERN: recent results
title_sort kaon programme at cern: recent results
topic Particle Physics - Experiment
url https://dx.doi.org/10.22323/1.134.0181
http://cds.cern.ch/record/1398493
work_keys_str_mv AT goudzovskievgueni kaonprogrammeatcernrecentresults

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