A precision lepton universality test by measurement of the helicity suppressed ratio of leptonic decay rates of the charged kaon with 10e5 K+- ->e+- nu decays collected by the NA62 experiment in 2007-08 is presented. The record accuracy of 0.4% constrains the parameter space of new physics models with extended Higgs sector, a fourth generation of quarks and leptons or sterile neutrinos. An improved upper limit on the rate of the lepton number violating decay K+- -> mu+- mu+- from the NA48/2 experiment, which probes the resonant enhancement of the rate in the presence of heavy Majorana neutrinos in the 100 MeV range, is also presented.

Aglieri Rinella, G., Ambrosino, F., Angelucci, B., Antonelli, A., Anzivino, G., Arcidiacono, R., et al. (2013). Lepton flavour universality and lepton flavour conservation tests at CERN. In Proceedings of QFTHEP 2013. PoS - Proceedings of Science.

Lepton flavour universality and lepton flavour conservation tests at CERN

BONAIUTO, VINCENZO;SANTOVETTI, EMANUELE;SARGENI, FAUSTO;
2013-01-01

Abstract

A precision lepton universality test by measurement of the helicity suppressed ratio of leptonic decay rates of the charged kaon with 10e5 K+- ->e+- nu decays collected by the NA62 experiment in 2007-08 is presented. The record accuracy of 0.4% constrains the parameter space of new physics models with extended Higgs sector, a fourth generation of quarks and leptons or sterile neutrinos. An improved upper limit on the rate of the lepton number violating decay K+- -> mu+- mu+- from the NA48/2 experiment, which probes the resonant enhancement of the rate in the presence of heavy Majorana neutrinos in the 100 MeV range, is also presented.
2013
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
English
Rilevanza internazionale
Articolo scientifico in atti di convegno
Aglieri Rinella, G., Ambrosino, F., Angelucci, B., Antonelli, A., Anzivino, G., Arcidiacono, R., et al. (2013). Lepton flavour universality and lepton flavour conservation tests at CERN. In Proceedings of QFTHEP 2013. PoS - Proceedings of Science.
Aglieri Rinella, G; Ambrosino, F; Angelucci, B; Antonelli, A; Anzivino, G; Arcidiacono, R; Azhinenko, I; Balev, S; Biagioni, A; Biino, C; Bizzeti, A; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/97512
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