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arXiv 0801.3885hep-ex
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J/γ \to γ射线的分波分析

Partial wave analysis of J/ψ\to γϕϕ

BES Collaboration

摘要:

利用BESII探测器收集的$5.8 \times 10^7 J/ψ$事例,研究了$J/ψ\to γϕϕ\to γK^+ K^- K^0_S K^0_L$的辐射衰变.的$ϕϕ$不变的质量分布表现出近阈值增强,峰值约为2.24 GeV/ $c^{2}$。分波分析表明,该结构由质量为$2.24^{+0.03}_{-0.02}{}^{+0.03}_{-0.02}$ GeV/ $c^{2}$、宽度为$0.19 \pm 0.03^{+0.06}_{-0.04}$ GeV/$c^{2}$的$0^{-+}$态($η(2225)$)主导.产物支化分数为:$Br(J/ψ\to γη(2225))\cdot Br(η(2225)\to ϕϕ) = (4.4 \pm 0.4 \pm 0.8)\times 10^{-4}$。

英文摘要:

Using $5.8 \times 10^7 J/ψ$ events collected in the BESII detector, the radiative decay $J/ψ\to γϕϕ\to γK^+ K^- K^0_S K^0_L$ is studied. The $ϕϕ$ invariant mass distribution exhibits a near-threshold enhancement that peaks around 2.24 GeV/$c^{2}$. A partial wave analysis shows that the structure is dominated by a $0^{-+}$ state ($η(2225)$) with a mass of $2.24^{+0.03}_{-0.02}{}^{+0.03}_{-0.02}$ GeV/$c^{2}$ and a width of $0.19 \pm 0.03^{+0.06}_{-0.04}$ GeV/$c^{2}$. The product branching fraction is: $Br(J/ψ\to γη(2225))\cdot Br(η(2225)\to ϕϕ) = (4.4 \pm 0.4 \pm 0.8)\times 10^{-4}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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