Study of J/ψ and ψ(3686) → Σ(1385)⁰ Σ̅(1385)⁰ and Ξ⁰ Ξ̅⁰

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Abstract

We study the decays of J/ψ and ψ(3686) to the final states Σ(1385)⁰ Σ̅(1385)⁰ and Ξ⁰ Ξ̅⁰ based on a single baryon tag method using data samples of (1310.6 ± 7.0) x 10⁶ J/psi and (447.9 ± 2.9) x 10⁶ ψ(3686) events collected with the BESIII detector at the BEPCII collider. The decays to Σ(1385)⁰ Σ̅(1385)⁰ are observed for the first time. The measured branching fractions of J/ψ and ψ(3686) to Ξ⁰ Ξ̅⁰ are in good agreement with, and much more precise than, the previously published results. The angular parameters for these decays are also measured for the first time. The measured angular decay parameter for J/ψ → Σ(1385)⁰ Σ̅(1385)⁰, α = -0.64 ± 0.03 ± 0.10, is found to be negative, different to the other decay processes in this measurement. In addition, the "12% rule" and isospin symmetry in the decays of J/ψ and ψ(3686) to Ξ⁰ Ξ̅⁰ and Σ(1385) Σ̅(1385) are tested.

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Keywords

Charmonium, Branching fractions (Nuclear physics), Angular distribution (Nuclear physics), Baryons, J/ψ (J/psi) meson, Isobaric spin

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This work is supported in part by National Key Basic Research Program of China (no. 2015CB856700); National Natural Science Foundation of China (NSFC) (nos. 11235011, 11322544, 11335008, 11425524, 11475207, 11505034, 11565006, 11635010); Joint Large-Scale Scientific Facility Funds of the NSFC and CAS {nos. U1232107, U1232201, U1332201, U1532257, U1532258); CAS (nos. KJCX2-YW-N29, KJCX2-YW-N45); Collaborative Research Center CRC (no. 1044, FOR 2359); Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) (no. 530-4CDP03); Ministry of Development of Turkey (no. DPT2006K-120470; U.S. Department of Energy (nos. DE-FG02-05ER41374, DE-SC-0010504, DE-SC-0010118, DE-SC-0012069); WCU Program of National Research Foundation of Korea (No. R32-2008-000-10155-0).

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CC BY 4.0 (Attribution), ©2017 The Authors

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