Studies of charmed strange baryons in the $\Lambda D$ final state at Belle

分类： 物理学 >> 核物理学 提交时间： 2016-08-26

Kato, Y. and others

摘要： We report the discovery of Ξc(3055)0, observed by its decay into the final state ΛD0, and present the first observation and evidence of the decays of Ξc(3055)+ and Ξc(3080)+ into ΛD+. We also perform a combined analysis of the ΛD+ with the Σ++cK− and Σ∗++cK− decay modes to measure the ratios of branching fractions, masses and widths with improved accuracy. We measure the ratios of branching fractions B(Ξc(3055)+→ΛD+)/B(Ξc(3055)+→Σ++cK−)=5.09±1.01±0.76, B(Ξc(3080)+→ΛD+)/B(Ξc(3080)+→Σ++cK−)=1.29±0.30±0.15, and B(Ξc(3080)+→Σ∗++cK−)/B(Ξc(3080)+→Σ++cK−)=1.07±0.27±0.01, where the uncertainties are statistical and systematic. The analysis is performed using a 980 fb−1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e− collider.

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