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arXiv 0711.4645hep-phhep-ex
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手征夸克模型中的粲重子强衰变

Charmed baryon strong decays in a chiral quark model

Xian-Hui Zhong, Qiang Zhao

摘要:

在手征夸克模型中研究了粲重子强衰变。成功地计算了$Λ^+_c(2593)$、$Λ^+_c(2625)$、$Σ^{++,+,0}_c$和$Σ^{+,0}_c(2520)$的衰变数据,从而将赝标介子夸克耦合固定在有效的手征拉格朗日量中.把这个框架扩展到分析新观察到的粲重子的强衰变,我们把$Λ_c(2880)$和$Λ_c(2940)$分类为N=2壳层中的$D$波态,$Λ_c(2880)$可以是$|Λ_c ^2 D_{λλ}{3/2}^+>$,$Λ_c(2940)$可以是$|Λ_c ^2 D_{λλ}{5/2}^+>$ .计算还表明,$Λ_c(2765)$很可能是N=1壳层的$ρ$模$P$波激发态,并倾向于$|Λ_c ^4P_ρ1/2^->$构型. $Σ_c(2800)$倾向于成为$|Σ_c ^2P_λ{1/2}^->$状态。但不能排除它是$|Σ^{++}_c ^4 P_λ{5/2}^->$。

英文摘要:

Charmed baryon strong decays are studied in a chiral quark model. The data for the decays of $Λ^+_c(2593)$, $Λ^+_c(2625)$, $Σ^{++,+,0}_c$ and $Σ^{+,0}_c(2520)$, are accounted for successfully, which allows to fix the pseudoscalar-meson-quark couplings in an effective chiral Lagrangian. Extending this framework to analyze the strong decays of the newly observed charmed baryons, we classify that both $Λ_c(2880)$ and $Λ_c(2940)$ are $D$-wave states in the N=2 shell; $Λ_c(2880)$ could be $|Λ_c ^2 D_{λλ}{3/2}^+>$ and $Λ_c(2940)$ could be $|Λ_c ^2 D_{λλ}{5/2}^+>$. Our calculation also suggests that $Λ_c(2765)$ is very likely a $ρ$-mode $P$-wave excited state in the N=1 shell, and favors a $|Λ_c ^4P_ρ1/2^->$ configuration. The $Σ_c(2800)$ favors being a $|Σ_c ^2P_λ{1/2}^->$ state. But its being $|Σ^{++}_c ^4 P_λ{5/2}^->$ cannot be ruled out.

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