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IHEP 2008 - 27 (In English)
O.G.Tchikilev, S.A.Akimenko, G.I.Britvich, A.P.Filin, A.S.Konstantinov, I.Y.Korolkov, V.M.Leontiev, V.P.Novikov, V.F.Obraztsov, V.A.Polyakov, V.I.Romanovsky, V.A.Uvarov, O.P.Yushchenko (IHEP, Protvino, Russia), V.N.Bolotov, V.A.Duk, S.V.Laptev, A.Yu.Polyarush (INR, Russian Academy of Sciences, Moscow),
Measurement of the Interference Term INT¯ in the Radiative Kaon Decay K¯ —› \mu¯ \bar\nu \gamma
Protvino, 2008. Ц 11 с., 7 рис., библиогр.: 11.


Using data collected with the «ISTRA+» spectrometer during the 2001 run of the U70 proton synchrotron at IHEP, we report the first measurement of the interference term INT¯ in the radiative kaon decay K¯ —› \mu¯\overline{\nu}\gamma We find the difference of the vector and axial form factors FV – FA = 0.197 ± 0.052(stat) ± 0.017(syst). The measured value is 2.6 standard deviations above the O(p4) ChPT prediction equal to 0.055.


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