First observation of the (Formula presented) decay


Ablikim M., Ablikim M., Achasov M., Adlarson P., Ai X., Akondi C., ...Daha Fazla

Physical Review D, cilt.113, sa.7, 2026 (SCI-Expanded, Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 113 Sayı: 7
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1103/ckyx-hyjm
  • Dergi Adı: Physical Review D
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, INSPEC, MathSciNet, zbMATH
  • Boğaziçi Üniversitesi Adresli: Hayır

Özet

Using ð10087 ± 44Þ × 106 J=ψ events collected with the BESIII detector at the BEPCII collider, we report the first observation of the decay ηc → Ξ0Ξ̄0. The interference between J=ψ → γηc → γΞ0Ξ̄0 and J=ψ → γΞ0Ξ̄0jnon−resonance is considered in the Ξ0Ξ̄0 mass spectrum fits. The branching fractions are measured to be Bðηc → Ξ0Ξ̄0Þ ¼ ð1.33 ± 0.03 ± 0.18Þ × 10−3 for the constructive interference and Bðηc → Ξ0Ξ̄0Þ ¼ ð1.63 ± 0.04 ± 0.21Þ × 10−3 for the destructive interference, where the first uncertainties are statistical and the second are systematic.