Study of the J/ψ decays to ΛΛ¯ and ΣΣ
Abstract
Using 58 million J/ψ events collected by the BES-II detector at the BEPC, the decays J/ψ→ΛΛ¯ and ΣΣ are analysed. The branching fractions are measured to be Br(J/ψ→ΛΛ¯)=(2.03±0.03±0.15)×10 and Br(J/ψ→ΣΣ)=(1.33±0.04±0.11)×10. The angular distribution is of the form dNdcosθ=N(1+αcosθ), with α=0.65±0.11±0.03 for J/ψ→ΛΛ¯ and α=-0.24±0.19±0.07 for J/ψ→ΣΣ.
- Publication:
-
Physics Letters B
- Pub Date:
- January 2006
- DOI:
- 10.1016/j.physletb.2005.10.079
- arXiv:
- arXiv:hep-ex/0506020
- Bibcode:
- 2006PhLB..632..181B
- Keywords:
-
- 13.20.Gv;
- 14.20.Jn;
- 23.20.En;
- Hyperons;
- Angular distribution and correlation measurements;
- High Energy Physics - Experiment
- E-Print:
- 11 pages, 5 figures