Observation of ψ (3686)→ Ξ (1530)- Ξ ̄ (1530)+ and Ξ (1530)- Ξ ̄ + OBSERVATION of ... ABLIKIM M. et al.


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Ablikim M., Achasov M., Adlarson P., Ahmed S., Albrecht M., Alekseev M., ...More

Physical Review D, vol.100, no.5, 2019 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 100 Issue: 5
  • Publication Date: 2019
  • Doi Number: 10.1103/physrevd.100.051101
  • Journal Name: Physical Review D
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Ankara University Affiliated: No

Abstract

© 2019 authors. Published by the American Physical Society.Using 448.1×106 ψ(3686) events collected with the BESIII detector at BEPCII, we employ a single-baryon tagging technique to make the first observation of ψ(3686)→Ξ(1530)-Ξ̄(1530)+ and Ξ(1530)-Ξ̄+ decays with a statistical significance of more than 10σ and 5.0σ, respectively. The branching fractions are measured to be B(ψ(3686)→Ξ(1530)-Ξ̄(1530)+)=(11.45±0.40±0.59)×10-5 and B(ψ(3686)→Ξ(1530)-Ξ̄+)=(0.70±0.11±0.04)×10-5. The angular distribution parameter for ψ(3686)→Ξ(1530)-Ξ̄(1530)+ is determined to be α=0.40±0.24±0.06, which agrees with the theoretical predictions within 1σ. The first uncertainties are statistical, and the second systematic.