Observation of ψ (3686) →p p ̄ η′ and improved measurement of J /ψ →p p ̄ η′ OBSERVATION of ... M. ABLIKIM et al.


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Ablikim M., Achasov M., Ahmed S., Albrecht M., Alekseev M., Amoroso A., ...More

Physical Review D, vol.99, no.3, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 99 Issue: 3
  • Publication Date: 2019
  • Doi Number: 10.1103/physrevd.99.032006
  • Journal Name: Physical Review D
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Ankara University Affiliated: Yes

Abstract

We observe the process ψ(3686)→pp̄η′ for the first time, with a statistical significance higher than 10σ, and measure the branching fraction of J/ψ→pp̄η′ with an improved accuracy compared to earlier studies. The measurements are based on 4.48×108 ψ(3686) and 1.31×109 J/ψ events collected by the BESIII detector operating at the BEPCII. The branching fractions are determined to be B(ψ(3686)→pp̄η′)=(1.10±0.10±0.08)×10-5 and B(J/ψ→pp̄η′)=(1.26±0.02±0.07)×10-4, where the first uncertainties are statistical and the second ones systematic. Additionally, the η-η′ mixing angle is determined to be -24°±11° based on ψ(3686)→pp̄η′, and -24°±9° based on J/ψ→pp̄η′, respectively.