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arXiv · 1904.10078

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

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·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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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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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, 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. 2019-04-22. Measurement of the $K^+\rightarrow{\mu^+}{\nu_{\mu}}{\gamma}$ decay form factors in the OKA experiment. https://doi.org/10.1140/epjc%2Fs10052-019-7145-1

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