Speaker
Dr.
Vladimir Kravtsov
Description
A new precise measurement of the vector and axial-vector form factors difference $F_V-F_A$ in the decay $K^+\rightarrow{\mu^+}{\nu_{\mu}}{\gamma}$ is presented. About 145K events of $K^+\rightarrow{\mu^+}{\nu_{\mu}}{\gamma}$ have been selected in OKA experiment. The result is $F_V-F_A=0.135\pm0.017(stat)\pm0.024(syst)$. The number of events is about 1.5 times higher and both errors are smaller than last published OKA result. The presented result is considered as preliminary.
