New precise measurements of the Ξ⁰→Λγ and Ξ⁰→Σ⁰γ decay asymmetries

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• 作者：NA48/1 Collaboration ; J.R. Batley ; G.E. Kalmus ; C. Lazzeroni ; D.J. Munday ; M. Patel ; M.W. Slater ; S.A. Wotton ; R. Arcidiacono ; G. Bocquet ; A. Ceccucci ; D. Cundy ; N. Doble ; V. Falaleev ; L. Gatignon ; A.
• 关键词：Hyperon ; Decay asymmetry
• 刊名：Physics Letters B
• 出版年：2010
• 出版时间：4 October 2010
• 年：2010
• 卷：693
• 期：3
• 页码：241-248
• 全文大小：276 K

文摘

The decay asymmetries of the weak radiative hyperon decays Ξ⁰→Λγ and Ξ⁰→Σ⁰γ have been measured with high precision using data of the NA48/1 experiment at CERN. From about 52 000 Ξ⁰→Λγ and 15 000 Ξ⁰→Σ⁰γ decays, we obtain for the decay asymmetries α_Ξ⁰→Λγ=−0.704±0.019_stat±0.064_syst and α_{Ξ⁰→Σ⁰γ}=−0.729±0.030_stat±0.076_syst, respectively. These results are in good agreement with previous experiments, but more precise.