Using ð27.12  0.14Þ × 108 ψð3686Þ events collected with the BESIII detector operating at the BEPCII collider, we have observed the decay ψð3686Þ → Σ0Σ ̄0φ for the first time with a statistical significance of 7.6σ. Its branching fraction is measured to be ð2.64  0.32stat  0.12sysÞ × 10−6, where the first uncertainty is statistical and the second is systematic. The result is consistent with the previous measurement of its isospin partner process ψð3686Þ → ΣþΣ ̄−φ, aligning with the naive expectation of isospin symmetry. In addition, we search for potential intermediate states in the Σ0φ (Σ ̄0φ) invariant mass distribution and a possible threshold enhancement in the Σ0Σ ̄0 system, but no conclusive evidence of them is observed.
Study of the decay ψ(3686) → Σ0Σ¯ 0ϕ
Garzia, I.;
2025
Abstract
Using ð27.12 0.14Þ × 108 ψð3686Þ events collected with the BESIII detector operating at the BEPCII collider, we have observed the decay ψð3686Þ → Σ0Σ ̄0φ for the first time with a statistical significance of 7.6σ. Its branching fraction is measured to be ð2.64 0.32stat 0.12sysÞ × 10−6, where the first uncertainty is statistical and the second is systematic. The result is consistent with the previous measurement of its isospin partner process ψð3686Þ → ΣþΣ ̄−φ, aligning with the naive expectation of isospin symmetry. In addition, we search for potential intermediate states in the Σ0φ (Σ ̄0φ) invariant mass distribution and a possible threshold enhancement in the Σ0Σ ̄0 system, but no conclusive evidence of them is observed.| File | Dimensione | Formato | |
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PhysRevD.111.052012.pdf
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