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Measurement of the $K^+\rightarrow{\mu^+}{\nu_{\mu}}{\gamma}$ decay form factors in the OKA experiment

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arxiv 1904.10078 v1 pith:KMSY2MOP submitted 2019-04-22 hep-ex nucl-ex

V.I. Kravtsov , V.A. Duk , S.N. Filippov , E.N. Gushchin , A.A. Khudyakov , Yu.G. Kudenko , A.Yu. Polyarush , S.A. Akimenko
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A.V. Artamonov A.M. Blik 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 V.A. Uvarov O.P. Yushchenko V.N. Bychkov G.D. Kekelidze V.M. Lysan B.Zh. Zalikhanov
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classification hep-exnucl-ex
keywords gammarightarrowdecayexperimentfactorsformmeasurementaxial-vector
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abstract

A precise measurement of the vector and axial-vector form factors difference $F_V-F_A$ in the $K^+\rightarrow{\mu^+}{\nu_{\mu}}{\gamma}$ decay is presented. About 95K events of $K^+\rightarrow{\mu^+}{\nu_{\mu}}{\gamma}$ 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.

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