Kaon Radiative Decay K± → μνγ at CKM at the Fermilab Main Injector

High statistics data for the K → μνγ decay can allow the precision determination of the kaon structure dependent form factors. This study is possible at the proposed FNAL CKM experiment. CKM (Charged Kaons at the Main injector) is a decay-in-flight spectrometer with two Ring Imaging detectors(RICH), and designed to run at the main injector with a high kaon flux. The radiative decay data might be taken complementary to the primary CKM effort to study the rare kaon decay (K → πνν̄) for which CKM was primarily designed. We summarize here the underlying physics of K → μνγ, the experimental status, and how the CKM spectrometer may be adapted for this study.