Measurement of the Branching Fraction for the Decay ψ(3686) → ϕK_S⁰ K_S⁰

2023/03/15 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +592
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2303.08317

Abstract

Based on (448.1 ± 2.9 )× 10⁶ ψ(3686) events collected with the BESIII detector operating at the BEPCII collider, the decay ψ(3686)→ ϕK_S⁰ K_S⁰ is observed for the first time. Taking the interference between ψ(3686) decay and continuum production into account, the branching fraction of this decay is measured to be B(ψ(3686)→ϕK_S⁰ K_S⁰ ) = (3.53 ± 0.20 ± 0.21)× 10^-5, where the first uncertainty is statistical and the second is systematic. Combining with the world average value for \mathcal B(J/ψ→ ϕK⁰_SK⁰_S), the ratio B(ψ(3686)→ ϕK_S⁰ K_S⁰)/B(J/ψ→ ϕK_S⁰ K_S⁰) is determined to be (6.0± 1.6)%, which is suppressed relative to the 12% rule.

Related

• Observation of ψ(3686) → Ξ^- K⁰_S Ω⁺ +c.c
• Observation of ψ(3686)→ 3ϕ
• Observation of ψ(3686) → K^-Λ(1520)Ξ⁺ + c.c.
• Observation of ψ(3686) → Ω^- K⁺ Ξ⁰ +c.c
• Study of the decays ψ(3686)→γχ_cJ→γpK^*+Λ+c.c. and ψ(3686)→pK^*+Λ+c.c.