Assignments of Λ_Q and Ξ_Q baryons in the heavy quark-light diquark picture
Assignments of Λ_Q and Ξ_Q baryons in the heavy quark-light diquark picture
复制标题
重夸克-轻双夸克图中 Lambda(Q) 和 Xi(Q) 重子的研究
DOI：
10.1140/epja/i2015-15082-3
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发表时间：
2015
影响因子：
2.7
通讯作者：
Zhang Ai Lin
中科院分区：
文献类型：
--
作者：
Chen Bing;Wei Ke Wei;Zhang Ai Lin
本文将相对论通量管模型中解析导出的一个新的质量公式应用于ΛQ和ΞQ （Q = c或b夸克）重子的质量谱。为此，采用了重夸克-轻夸克图。我们发现所有可用的ΛQ和ΞQ状态的质量都可以很好地理解，这些状态的赋值似乎与强衰变性质并不矛盾。Λc(2760)+和Ξc（2980）被指定为第一径向激励，JP = 1/2+。Λc(2940)+和Ξc（3123）可能是2P态。Λc(2880)+和Ξc（3080）是良好的1D候选者，JP = 5/2+。Ξc（3055）可能为一维态，JP = 3/2+。Λb(5912)0和Λb(5920)0分别支持JP = 1/2−和3/2−的1P赋值。我们提出了一个搜索Λ ~ c2（5/2−）状态，它可以帮助区分重夸克和三体格式。
We apply a new mass formula which is derived analytically in the relativistic flux tube model to the mass spectra of ΛQ and ΞQ (Q = c or b quark) baryons. To this end, the heavy quark-light diquark picture is employed. We find that all masses of the available ΛQ and ΞQ states can be understood well..The assignments to these states do not appear to contradict the strong decay properties. Λc(2760)+ and Ξc(2980) are assigned to the first radial excitations with JP = 1/2+. Λc(2940)+ and Ξc(3123) might be the 2P states. The Λc(2880)+ and Ξc(3080) are the good 1D candidates with JP = 5/2+. Ξc(3055) is likely to be a 1D state with JP = 3/2+. Λb(5912)0 and Λb(5920)0 favor the 1P assignments with JP = 1/2− and 3/2− , respectively. We propose a search for the Λ˜c2(5/2−) state which can help to distinguish the diquark and three-body schemes.