KTEV RESULTS ON V_(US) AND RARE K_L DECAYS

摘要

We measured the branching fractions of six major K_L decay modes, and measured |V_(us)| = 0.2252 ± 0.0008_(KTeV) ±0.0021_(ext). We also obtained a new upper limit, B(K_L → π~0e~+e~-) < 2.8 X 10~(-10) (90% CL), and a improved the CP-violating asymmetry parameter in the K_L → π~+π~-e~+e~- decays.