Orateur
Dr
Andreas Winhart
(University of Mainz)
Description
The SM prediction for the ratio of purely leptonic decay rates of the charged kaon $R_K=\Gamma(K_{e2}/\Gamma(K_{\mu2}))$ has an excellent sub-permille precision. Due to the helicity suppression of the SM contribution, the ratio is sensitive to non-SM effects; in particular, LFV contributions in the MSSM can modify it by a few percent without contradicting any other presently known experimental constraints.
Current experimental precision is limited to 4.5%, and is insufficient for a stringent SM test. The NA62 experiment at the CERN SPS is aiming at improving the precision by almost an order of magnitude, using a dedicated data set collected in 2007/08. The status of the analysis will be discussed in detail.
Author
Dr
Andreas Winhart
(University of Mainz)
