The NA62 RICH Detector

The goal of the CERN NA62 experiment is to measure the ultra‐rare (Branching Ratio, BR ∼10−10) charged kaon decay K+→π+vv with an accuracy of 10%. The main background, the K+→μ+v decay (BR ∼63%), must be suppressed by a rejection factor of 4×10−13. This can be accomplished using a combination of several methods and detectors. The RICH detector will contribute to this task and will also provide the pion crossing time with a resolution of the order of 100 ps. The details of the RICH project as well as the results from two different test beams performed on a RICH prototype will be presented.