Extraction of kaon formfactors from K−→μ−νγ decay at ISTRA+ setup

V.A. Duk,V.N. Bolotov,V.A. Lebedev, A.A. Khudyakov, A.I. Makarov,A.Yu. Polyarush, V.P. Novikov,S.A. Akimenko,G.I. Britvich, A.P. Filin,A.V. Inyakin,I.Ya. Korolkov,V.M. Leontiev,V.F. Obraztsov,V.A. Polyakov, V.I. Romanovsky,O.G. Tchikilev,V.A. Uvarov,O.P. Yushchenko

Physics Letters B（2011）

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摘要

The radiative decay K−→μ−νμγ has been studied at ISTRA+ setup in a new kinematic region. About 22K events of K−→μ−νμγ have been observed. The sign and value of FV−FA have been measured for the first time. The result is FV−FA=0.21±0.04(stat)±0.04(syst).

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关键词

Radiative kaon decays,Chiral perturbation theory,Kaon formfactors

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