Extraction of Kaon Formfactors from K- -> mu- numu gamma Decay at ISTRA+ Setup
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- numu 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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