Measurement of the decay form factors in the OKA experiment

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

doi:10.1140/epjc/s10052-019-7145-1

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2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2019) 79: 635
https://doi.org/10.1140/epjc/s10052-019-7145-1

Regular Article - Experimental Physics

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

V. I. Kravtsov²^*, S. A. Akimenko¹, A. V. Artamonov¹, A. M. Blik¹, V. S. Burtovoy¹, V. N. Bychkov³, S. V. Donskov¹, V. A. Duk²^,4, A. P. Filin¹, S. N. Filippov², A. M. Gorin¹, E. N. Gushchin², A. V. Inyakin¹, G. D. Kekelidze³, G. V. Khaustov¹, S. A. Kholodenko¹, A. A. Khudyakov², V. N. Kolosov¹, Yu. G. Kudenko²^,5^,6, V. F. Kurshetsov¹, V. A. Lishin¹, V. M. Lysan³, M. V. Medynsky¹, Yu. V. Mikhailov¹, V. F. Obraztsov¹, V. A. Polyakov¹, A. Yu. Polyarush², A. V. Popov¹, V. I. Romanovsky¹, V. I. Rykalin¹, A. S. Sadovsky¹, V. D. Samoilenko¹, V. K. Semenov¹, M. M. Shapkin¹, O. V. Stenyakin¹, O. G. Tchikilev¹, V. A. Uvarov¹, O. P. Yushchenko¹ and B. Zh. Zalikhanov³

¹ NRC “Kurchatov Institute”-IHEP, 142281, Protvino, Russia
² Institute for Nuclear Research of the Russian Academy of Sciences, 117312, Moscow, Russia
³ Joint Institute of Nuclear Research, 141980, Dubna, Russia
⁴ Present address: University of Birmingham, Birmingham, UK
⁵ Moscow Institute of Physics and Technology, Moscow Region, Russia
⁶ NRNU Moscow Engineering Physics Institute (MEPhI), Moscow, Russia

^* e-mail: kravtsov@inr.ru

Received: 24 April 2019
Accepted: 16 July 2019
Published online: 29 July 2019

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 $F_V-F_A=0.134\pm 0.021(stat)\pm 0.027(syst)$ . Both errors are smaller than in the previous $$F_V-F_A$$ measurements.