An experimental investigation of the radiative structure decay K+ → e+υγ |
| |
Authors: | J Heintze G Heinzelmann P Igo-Kemenes R Mundhenke H Rieseberg B Schürlein HW Siebert V Soergel H Stelzer K-P Streit AH Walenta |
| |
Institution: | 1. Physikalisches Institut der Universität Heidelberg, Heidelberg, Germany;2. CERN, Geneva, Switzerland |
| |
Abstract: | The decay K+ → e+υγ has been investigated. For the structure-dependent part with positive γ-helicity (SD+) the branching ratio 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 .For the decay the limit 90% confidence level) was found. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |