Measurement of the $K^+\rightarrow{μ^+}{ν_μ}γ$ decay form factors in the OKA experiment
hep-ex
/ Authors
V. I. Kravtsov, V. A. Duk, S. N. Filippov, E. N. Gushchin, A. A. Khudyakov, Yu. G. Kudenko, A. Yu. Polyarush, S. A. Akimenko, A. V. Artamonov, A. M. Blik
and 29 more authors
V. S. Burtovoy, S. V. Donskov, A. P. Filin, A. M. Gorin, A. V. Inyakin, G. V. Khaustov, S. A. Kholodenko, V. N. Kolosov, V. F. Kurshetsov, V. A. Lishin, M. V. Medynsky, Yu. V. Mikhailov, V. F. Obraztsov, V. A. Polyakov, A. V. Popov, V. I. Romanovsky, V. I. Rykalin, A. S. Sadovsky, V. D. Samoilenko, V. K. Semenov, M. M. Shapkin, O. V. Stenyakin, O. G. Tchikilev
/ Abstract
A precise measurement of the vector and axial-vector form factors difference $F_V-F_A$ in the $K^+\rightarrow{μ^+}{ν_μ}γ$ decay is presented. About 95K events of $K^+\rightarrow{μ^+}{ν_μ}γ$ are selected in the OKA experiment. The result is $F_V-F_A=0.134\pm0.021(stat)\pm0.027(syst)$. Both errors are smaller than in the previous $F_V-F_A$ measurements.