Measurement of the $K^{+}\to \hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼{\hat{I}}^3$ decay form factors in the OKA experiment

Abstract

A precise measurement of the vector and axial-vector form factors difference $F_V-F_A$ in the $K^{+}\to \hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼{\hat{I}}^3$ decay is presented. About 95K events of $K^{+}\to \hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼{\hat{I}}^3$ are selected in the OKA experiment. The result is $F_V-F_A=0.134\pm 0.021(stat)\pm 0.027(syst)$. Both errors are smaller than in the previous $F_V-F_A$ measurements.

9 pages, 8 figures