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arXiv 1002.1577hep-ph
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重子的Quark-Diquark系统和轻态的SU(6)SYMMETRY

Quark--Diquark Systematics of Baryons and the SU(6)SYMMETRY for Light States

A. V. Anisovich, V. V. Anisovich, M. A. Matveev, V. A. Nikonov, A. V. Sarantsev, T. O. Vulfs

摘要:

我们继续尝试将由轻夸克组成的重子系统化为夸克-双夸克系统。使用两个双夸克的概念:(i)$D^{1}_{1}$,具有自旋$S_D=1$和同位旋$I_D=1$;(ii)$D^{0}_{0}$,具有$S_D=0$和$I_D=0$。在这里,我们试图解决低位$Δ(\frac 52^-)$状态的问题:在最后的实验中,观察到的最轻状态是在$\ga 2200$ MeV,而不是像20年前所说的那样在$1900 - 2000$ MeV。我们正在寻找不同的系统化变体与禁止低$Δ(\frac 52^-)$国家的质量区域$\la 2000$兆电子伏。我们看到,在角动量L=1的$qD^{1}_{1}$态上包含SU(6)约束,导致最轻的$Δ(\frac 52^-)$等压线移动到$\sim 2300$ MeV。详细介绍了SU(6)约束下的低态$qD^{1}_{1}$和$qD^{0}_{0}$(含$L=0,1$)的方案。

英文摘要:

We continue our attempts to systematize baryons, which are composed of light quarks ($q=u,d$), as quark--diquark systems. The notion of two diquarks is used: (i) $D^{1}_{1}$, with the spin $S_D=1$ and isospin $I_D=1$ and (ii) $D^{0}_{0}$, with $S_D=0$ and $I_D=0$. Here we try to resolve the problem of the low-lying $Δ(\frac 52^-)$ states: in the last experiments the lightest state is observed at $\ga 2200$ MeV, not at $1900 - 2000$ MeV as it has been stated 20 years ago. We are looking for different systematization variants with the forbidden low-lying $Δ(\frac 52^-)$ states in the mass region $\la 2000$ MeV. We see that the inclusion of the SU(6) constraints on $qD^{1}_{1}$ states with angular momentum L=1 results in a shift of the lightest $Δ(\frac 52^-)$ isobar to $\sim 2300$ MeV. The scheme with the SU(6) constraints for low-lying $qD^{1}_{1}$ and $qD^{0}_{0}$ states (with $L=0,1$) is presented in detail here.

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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