The branching fractions of K+- -> pi+- e+e- and K+- -> pi+- mu+mu- rare decays have been measured by the NA48/2 collaboration at CERN SPS. An improved upper limit has been set on the Lepton Number Violating decay K+- -> pi-+ mu+- mu+-. The branching ratio R_K = Gamma(K+- -> e+- nu)/Γ(K+- -> mu+- nu) has been measured by the NA62 collaboration at CERN SPS with an unprecedented accuracy, allowing a precise test of lepton flavour universality. The NA62 experiment is now undergoing a major upgrade in order to measure the branching fraction of the very rare K+ -> pi+ nu antinu decay with a 10% precision.
RECENT RESULTS ON RARE KAON DECAYS FROM NA48/2 AND NA62 EXPERIMENTS AT CERN SPS / Bizzeti, Andrea. - STAMPA. - (2012), pp. 306-311. (Intervento presentato al convegno Particle Physics at the Tercentenary of Mikhail Lomonosov tenutosi a Moscow, Russia nel 18 – 24 August 2011).
RECENT RESULTS ON RARE KAON DECAYS FROM NA48/2 AND NA62 EXPERIMENTS AT CERN SPS
BIZZETI, Andrea
2012
Abstract
The branching fractions of K+- -> pi+- e+e- and K+- -> pi+- mu+mu- rare decays have been measured by the NA48/2 collaboration at CERN SPS. An improved upper limit has been set on the Lepton Number Violating decay K+- -> pi-+ mu+- mu+-. The branching ratio R_K = Gamma(K+- -> e+- nu)/Γ(K+- -> mu+- nu) has been measured by the NA62 collaboration at CERN SPS with an unprecedented accuracy, allowing a precise test of lepton flavour universality. The NA62 experiment is now undergoing a major upgrade in order to measure the branching fraction of the very rare K+ -> pi+ nu antinu decay with a 10% precision.
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