Two RICH detectors as Velocity Spectrometer in the CKM Experiment

Jurgen Engelfried

Universidad Autonoma de San Luis Potosi, Mexico 
For the CKM RICH Group

     We will present the design of a velocity spectrometer, to be used in the recently approved CKM experiment. CKM's main goal is the measurement of the branching ratio of K+ π+νν   with a precision of 10%, via decays in flight of the K+. The design of both RICH detectors is based on the SELEX Phototube RICH. We will discuss the design and the expected performance, based on studies with SELEX data and on Monte Carlo Simulations.