Extraction of Kaon Formfactors from K^- -> mu^- nu_mu gamma Decay at ISTRA+ Setup
The ISTRA+ Collaboration: V. A. Duk, V. N. Bolotov, A. A. Khudyakov,, V. A. Lebedev, A. I. Makarov, V. P. Novikov, A. Yu. Polyarush, 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
TL;DR
This paper reports the first measurement of the difference between vector and axial-vector form factors in the radiative decay of a kaon, using data from the ISTRA+ experiment, providing new insights into kaon structure.
Contribution
First measurement of Fv-Fa in K^- -> mu^- nu_mu gamma decay at ISTRA+ setup, expanding understanding of kaon form factors.
Findings
Measured Fv-Fa=0.21(4)(4)
Observed about 22,000 decay events
Studied decay in a new kinematical region
Abstract
The radiative decay K->mu nu gamma has been studied at ISTRA+ setup in a new kinematical region. About 22K events of K^- -> mu^- nu_mu gamma have been observed. The sign and value of Fv-Fa have been measured for the first time. The result is Fv-Fa=0.21(4)(4).
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