Analysis of the 1S and 2S states of Lambda(Q) and Xi(Q) with QCD sum rules

Analysis of the 1S and 2S states of Lambda(Q) and Xi(Q) with QCD sum rules
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用 QCD 和规则分析 Lambda(Q) 和 Xi(Q) 的 1S 和 2S 状态

DOI:
10.1088/1674-1137/abc1d3
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发表时间:
2021
期刊:
影响因子:
3.6
通讯作者:
Wang Hui-Juan
Wang Hui-Juan
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wang Zhi-Gang;Wang Hui-Juan

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在本文中,我们通过以一致的方式对维度 <?CDATA $10$?> 的真空凝聚体进行算子乘积展开,研究了具有自旋宇称 <?CDATA $J^P={1\over 2}^{+}$?> 的味道反三重重重子态 <?CDATA $\Lambda_Q$?> 和 <?CDATA $\Xi_Q$?> 的基态和第一径向激发态。我们首次观察到高维真空凝聚态发挥了重要作用,并随着重重子态Borel参数的变化获得了非常稳定的QCD和规则。第一径向激发态 <?CDATA $\Lambda_b(2{{S}})$?> 的预测质量 <?CDATA $6.08\pm0.09\,{\rm{GeV}}$?>、<?CDATA $2.78\pm0.08\,{\rm{GeV}}$?> 和 <?CDATA $2.96\pm0.09\,{\rm{GeV}}$?> <?CDATA $\Lambda_c(2{{S}})$?> 和 <?CDATA $\Xi_c(2{{S}})$?> 分别与实验数据非常吻合,并支持分配 <?CDATA $\Lambda_b(6072)$?>、<?CDATA $\Lambda_c(2765)$?> 和 <?CDATA $\Xi_c(2980/2970)$?> 分别为 <?CDATA $\Lambda_b$?>、<?CDATA $\Lambda_c$?> 和 <?CDATA $\Xi_c$?> 的第一径向激发态。 <?CDATA $\Xi_b(2{{S}})$?> 的预测质量 <?CDATA $6.24\pm0.07\,{\rm{GeV}}$?> 可以在未来使用实验数据进行确认。
In this article, we study the ground states and the first radial excited states of the flavor antitriplet heavy baryon states <?CDATA $\Lambda_Q$?> and <?CDATA $\Xi_Q$?> with the spin-parity <?CDATA $J^P={1\over 2}^{+}$?> by carrying out operator product expansion up to vacuum condensates of dimension <?CDATA $10$?> in a consistent way. We observe for the first time that the higher dimensional vacuum condensates play an important role, and obtain very stable QCD sum rules with variations of the Borel parameters for the heavy baryon states. The predicted masses <?CDATA $6.08\pm0.09\,{\rm{GeV}}$?>, <?CDATA $2.78\pm0.08\,{\rm{GeV}}$?>, and <?CDATA $2.96\pm0.09\,{\rm{GeV}}$?> for the first radial excited states <?CDATA $\Lambda_b(2{{S}})$?>, <?CDATA $\Lambda_c(2{{S}})$?>, and <?CDATA $\Xi_c(2{{S}})$?>, respectively, are in excellent agreement with the experimental data and support assigning <?CDATA $\Lambda_b(6072)$?>, <?CDATA $\Lambda_c(2765)$?>, and <?CDATA $\Xi_c(2980/2970)$?> to be the first radial excited states of <?CDATA $\Lambda_b$?>, <?CDATA $\Lambda_c$?>, and <?CDATA $\Xi_c$?>, respectively. The predicted mass <?CDATA $6.24\pm0.07\,{\rm{GeV}}$?> for <?CDATA $\Xi_b(2{{S}})$?> can be confirmed using experimental data in the future.