Misc,

New physics limits from kaon decays

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(Jul 4, 2011)

Abstract

Searches for lepton flavour violation and lepton number violation in kaon decays by the NA62 and NA48/2 experiments at CERN are presented. A new measurement of the ratio of charged kaon leptonic decay rates \$R\_K=\Gamma(K\_e2)/\Gamma(K\_\mu2)\$ to sub-percent relative precision is discussed. An improved upper limit on the lepton number violating \$K^\pm\rightarrow\pi^\mp\mu^\pm\mu^\pm\$ decay rate is also reported. The future 10\% precision measurement of the branching ratio of the ultra-rare kaon decay \$K^+\rightarrow\pi^+\nu\nu\$ with the NA62 experiment is finally reviewed.

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