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
影响因子:
3.6
通讯作者:
Wang Hui-Juan
中科院分区:
文献类型:
--
作者:
Wang Zhi-Gang;Wang Hui-Juan
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.