Elsevier

Nuclear Physics B

Volume 149, Issue 3, 26 March 1979, Pages 365-380
Nuclear Physics B

An experimental investigation of the radiative structure decay K+ → e+υγ

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Abstract

The decay K+ → e+υγ has been investigated. For the structure-dependent part with positive γ-helicity (SD+) the branching ratio Γ(SD+)Γ(Kμ2) = (2.33 ± 0.42) × 10−5 is obtained from 51 ± 3 events observed in the kinematical region Ee ⩾ 235 MeV, Eγ > 48 MeV and θeγ > 140°. For the corresponding part with negative γ-helicity we obtain an upper limit Γ(SD)/Γ(SD+) < 11 (90% CL) from the sample of electrons with energies 220 MeV ⩽ Ee < 230 MeV and with no γ in the backward direction. This upper limit implies that the ratio of structure-dependent axial vector amplitudes lies outside the region −1.8 < aKυK < −0.54.

For the decay K+e+ννν the limit Γ(K+e+ννν)/Γ(Ke2) < 3.8 90% confidence level) was found.

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Work supported by the Bundesministerium für Forschung und Technologie.

★★

Now at IDAS GmbH, D 6250 Limburg, Kornmarkt 9, Germany.

Now at Brookhaven National Laboratory, Upton, NY, USA.

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