η_c(2S)→p\bar{p}π⁺π⁻π⁰衰变的证据及χ_{cJ}→p\bar{p}π⁺π⁻π⁰的观测
Evidence for $η_{c}(2S)\to p\bar{p}π^{+}π^{-}π^{0}$ and observation of $χ_{cJ} \to p\bar{p}π^{+}π^{-}π^{0}$
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中文总结 AI 辅助
BESIII利用2.712×10⁹个ψ(3686)事例，发现η_c(2S)衰变证据并观测χ_{cJ}相关衰变，精确测量了各衰变的分支分数
中文摘要 AI 辅助
利用北京正负电子对撞机（BEPCII）上的BESIII探测器收集的(2.712±0.014)×10⁹个ψ(3686)事例，研究ψ(3686)→γp\bar{p}π⁺π⁻π⁰过程。以3.3σ的信号显著性发现η_c(2S)→p\bar{p}π⁺π⁻π⁰衰变的证据，测得ψ(3686)→γη_c(2S)与η_c(2S)→p\bar{p}π⁺π⁻π⁰的分支乘积为(3.4±0.5±0.8)×10⁻⁶，其中第一个不确定度为统计不确定度，第二个为系统不确定度。观测到χ_{cJ}（J=0,1,2）的强衰变χ_{cJ}→p\bar{p}π⁺π⁻π⁰，测得其分支分数分别为：χ_{c0}→p\bar{p}π⁺π⁻π⁰=(4.79±0.01±0.40)×10⁻³，χ_{c1}→p\bar{p}π⁺π⁻π⁰=(2.13±0.01±0.17)×10⁻³，χ_{c2}→p\bar{p}π⁺π⁻π⁰=(3.72±0.01±0.29)×10⁻³。此外，以显著提高的精度更新了中间过程χ_{cJ}→p\bar{p}ω的分支分数：χ_{c0}→p\bar{p}ω=(5.76±0.01±0.42)×10⁻⁴，χ_{c1}→p\bar{p}ω=(1.85±0.01±0.13)×10⁻⁴，χ_{c2}→p\bar{p}ω=(4.51±0.01±0.33)×10⁻⁴。
英文摘要
Using $(2.712\pm0.014)\times 10^9$ $ψ(3686)$ events collected by the BESIII detector at the BEPCII collider, the $ψ(3686) \to γp\bar{p}π^+π^-π^0$ process is investigated. Evidence for the decay of $η_{c}(2S)\to p\bar{p}π^{+}π^{-}π^{0}$ is found with a signal significance of 3.3$σ$. The product of branching fractions of $\mathcal{B}[ψ(3686)\to γη_{c}(2S)]\times\mathcal{B}[η_{c}(2S)\to p\bar{p}π^{+}π^{-}π^{0}]$ is determined to be $(3.4\pm0.5\pm0.8) \times 10^{-6}$, where the first uncertainty is statistical and the second systematic. The hadronic decays of $χ_{cJ} \to p\bar{p}π^+π^-π^0$$~(J=0,1,2)$ are observed, and their branching fractions are measured to be $\mathcal{B}(χ_{c0}\to p\bar{p}π^{+}π^{-}π^{0})=(4.79\pm 0.01\pm0.40) \times 10^{-3}$, $\mathcal{B}(χ_{c1}\to p\bar{p}π^{+}π^{-}π^{0})=(2.13\pm 0.01\pm0.17) \times 10^{-3}$, and $\mathcal{B}(χ_{c2}\to p\bar{p}π^{+}π^{-}π^{0})=(3.72\pm 0.01\pm0.29) \times 10^{-3}$, respectively. Furthermore, the branching fractions for the intermediate processes $χ_{cJ}\to p\bar{p}ω$ are updated with significantly improved precision: $\mathcal{B}(χ_{c0}\to p\bar{p}ω)=(5.76\pm0.01\pm0.42)\times10^{-4}$, $\mathcal{B}(χ_{c1}\to p\bar{p}ω)=(1.85\pm0.01\pm0.13)\times10^{-4}$, and $\mathcal{B}(χ_{c2}\to p\bar{p}ω)=(4.51\pm0.01\pm0.33)\times10^{-4}$, respectively.
