Study of the radiative decay K++

Y. Akiba, T. Ishikawa, M. Iwasaki, K. H. Tanaka, S. Ohtake, H. Tamura, M. Nakajima, T. Yamanaka, T. Yamazaki, F. Naito, T. Suzuki, I. Arai, R. S. Hayano

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


The radiative decay K++ has been studied by a high-resolution magnetic spectrometer combined with a NaI(Tl) photon detector system. The momentum spectrum of muon from this decay mode was measured in the region 214.5<p<231.5 MeV/c. The observed partial decay rate of the radiative decay in this region agreed with the QED calculation within the error of 3%. The structure-dependent components of the decay were studied and new values of the form factors were obtained as FV+F()MK<0.23, -2.5<(FV-FA)()MK<0.3. By using these bounds the branching ratio was determined as B(,p<231.5 MeV/c)=(5.40.3)×10-3.

Original languageEnglish
Pages (from-to)2911-2920
Number of pages10
JournalPhysical Review D
Issue number11
Publication statusPublished - 1985


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