Kaon experiments at CERN: NA48 and NA62

Abstract

Searches for violation of lepton flavour universality and lepton number conservation in kaon decays by the NA62 and NA48/2 experiments at CERN, status and future plans of the CERN kaon programme are presented. A precision measurement of the helicity-suppressed ratio $R_K$ of the $K^{\pm }\to e^{\pm }\nu$ and $K^{\pm }\to {\mu }^{\pm }\nu$ decay rates has been performed using the full data set collected by the NA62 experiment in 2007--2008. The result is $R_K=(2.488\pm 0.010)\times 10^{-5}$, in agreement with the Standard Model expectation. An improved upper limit on the rate of the lepton number violating $K^{\pm }\to {\pi }^{\mp }{\mu }^{\pm }{\mu }^{\pm }$ decay from the NA48/2 experiment (2003--2004 data set) is presented. Finally, the NA62 project aiming at a measurement of the branching ratio of the ultra-rare decay $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ at 10% precision is discussed.

Talk given at PhiPsi 2011 conference (Novosibirsk, Russia, September 2011). To be published in Nucl.Phys.B Proc.Supp

References in corpus (9)

• Two-Loop Electroweak Corrections for the K -> pi nu anti-nu Decays
• New measurement of the K+ => pi+,nu,nubar branching ratio
• The Standard Model prediction for R_{e/mu}^{(pi,K)}
• Search for Lepton Flavor Violation in $K^{+}$ Decays
• Implications of Improved Upper Bounds on $|\Delta L|=2$ Processes
• New measurement of the K+- --> pi+-mu+mu- decay
• Anatomy and Phenomenology of the Lepton Flavor Universality in SUSY Theories
• Test of Lepton Flavour Universality in K+ --> l+nu Decays
• New limits on effective Majorana neutrino masses from rare kaon decays

Cited by in corpus (1)

• $K\to \pi {\ell }^{+}{\ell }^{-}$ form factor in the Large-N${}_c$ and cut-off regularization method