Measurement of radiative Σ±→nπ±γ decay |
| |
Authors: | H Ebenhöh F Eisele H Filthuth V Hepp E Leitner T Thouw G Zech |
| |
Institution: | 1. Institut für Hochenergiephysik, Universit?t Heidelberg, Bundesrepublik Deutschland
|
| |
Abstract: | The radiativeΣ + → nπ+ γ decay mode was analysed in the 81 cm SACLAY hydrogen bubble chamber exposed to a stoppingK ? beam at the CERN PS. The pion spectrum was measured up to momenta of 150 MeV/c in theΣ rest frame. We obtain the following branching ratios based on 180 Σ+→nπ+γ and 292Σ ?→ nπ?γ events:Γ(Σ+ → nπ+ γ)/Γ(Σ+→nπ+)=(0.93±0.10)×10?3 Γ(Σ?→nπ? γ)/Γ(Σ?→nπ?)=(0.46±0.06)×10?3. An unambiguous assignment ofS-wave to the Σ?→nπ? andP-wave toΣ +→nπ+ was obtained. The absolute and differential decay rates as well as the parity assignments are in good agreement with theoretical predictions. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |