Measurements of branching fractions and asymmetry parameters of Ξc0→ΛK¯?0 , Ξc0→Σ0 K¯?0 , and Ξc0→Σ+ K?? decays
Journal
Journal of High Energy Physics
Journal Volume
2021
Journal Issue
6
Date Issued
2021
Author(s)
Jia S et al.(The Belle collaboration)
Abstract
Using a data sample of 980 fb?1 collected with the Belle detector at the KEKB asymmetric-energy e+e? collider, we study the processes of Ξc0→ΛK¯?0, Ξc0→Σ0K¯?0, and Ξc0→Σ+K?? for the first time. The relative branching ratios to the normalization mode of Ξc0→Ξ?π+ are measured to beB(Ξc0→ΛK¯?0)/B(Ξc0→Ξ?π+)=0.18±0.02(stat.)±0.01(syst.),B(Ξc0→Σ0K¯?0)/B(Ξc0→Ξ?π+)=0.69±0.03(stat.)±0.03(syst.),B(Ξc0→Σ+K??)/B(Ξc0→Ξ?π+)=0.34±0.06(stat.)±0.02(syst.), where the uncertainties are statistical and systematic, respectively. We obtainB(Ξc0→ΛK¯?0)=(3.3±0.3(stat.)±0.2(syst.)±1.0(ref.))×10?3,B(Ξc0→Σ0K¯?0)=(12.4±0.5(stat.)±0.5(syst.)±3.6(ref.))×10?3,B(Ξc0→Σ+K?0)=(6.1±1.0(stat.)±0.4(syst.)±1.8(ref.))×10?3, where the uncertainties are statistical, systematic, and from B(Ξc0→Ξ?π+), respectively. The asymmetry parameters α(Ξc0→ΛK¯?0) and α(Ξc0→Σ+K??) are 0.15 ± 0.22(stat.) ± 0.04(syst.) and ?0.52 ± 0.30(stat.) ± 0.02(syst.), respectively, where the uncertainties are statistical followed by systematic. [Figure not available: see fulltext.] ? 2021, The Author(s).
Subjects
Branching fraction; Charm physics; e+-e? Experiments;
Type
journal article