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IHEP 2008 - 27 (In English) | ||
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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),
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Measurement of the Interference Term INT¯ in the Radiative Kaon
Decay K¯ —› \mu¯ \bar\nu \gamma
| Protvino, 2008. – 11 ñ., 7 ðèñ., áèáëèîãð.: 11.
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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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