Rare Kaon Decays at CERN SPS

摘要

Since their discovery the K-mesons continue to provide valuable information to the theory of the interactions between the elementary particles. In two years of data taking the NA48/2 experiment at CERN SPS recorded more than 4 billion K~ ± → π~±π~-π~± decays devoted to the search of CP violation in the charged kaon system. The huge statistics allows also a precise study of rare kaon decays. The results from the investigation of K~ ± → π~±e~+e- decay will be shown with their interpretation within several theoretical models. The continuation of the kaon program at CERN is the NA62 experiment devoted to the measurement of Br(K~± → π~±vv) decay with a precision of 10% in two years of data taking. The planned detector setup and the expected background and signal events will be presented. During 2007 a dedicated run devoted to NA62 prototype tests and study of K_(e2) decays was taken. The preliminary results from the study of Ke2 decays and the ratio R_K = |￡(K~± → e~±v)/|￡(K~± → μ~± v) at the NA48/2 and NA62 experiments will be shown.