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V. I. Kravtsov; S. A. Akimenko; A. V. Artamonov; A. M. Blik; V. S. Burtovoy; V. N. Bychkov; S. V. Donskov; V. A. Duk; A. P. Filin; S. N. Filippov; A. M. Gorin; E. N. Gushchin; A. V. Inyakin; G. D. Kekelidze; G. V. Khaustov; S. A. Kholodenko; A. A. Khudyakov; V. N. Kolosov; Yu. G. Kudenko; V. F. Kurshetsov; V. A. Lishin; V. M. Lysan; M. V. Medynsky; Yu. V. Mikhailov; V. F. Obraztsov; V. A. Polyakov; A. Yu. Polyarush; 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; V. A. Uvarov; O. P. Yushchenko; B. Zh. Zalikhanov
The European physical journal. C, Particles and fields, 07/2019, Volume: 79, Issue: 7Journal Article
Abstract A precise measurement of the vector and axial-vector form factors difference $$F_V-F_A$$ FV-FA in the $$K^+\rightarrow {\mu ^+}{\nu _{\mu }}{\gamma }$$ K+→μ+νμγ decay is presented. About 95K events of $$K^+\rightarrow {\mu ^+}{\nu _{\mu }}{\gamma }$$ K+→μ+νμγ are selected in the OKA experiment. The result is $$F_V-F_A=0.134\pm 0.021(stat)\pm 0.027(syst)$$ FV-FA=0.134±0.021(stat)±0.027(syst) . Both errors are smaller than in the previous $$F_V-F_A$$ FV-FA measurements.
