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Hidden beauty baryon states in the local hidden gauge approach with heavy quark spin symmetry

机译:隐藏的美丽重子状态在当地隐藏的规范方法与   重夸克旋转对称性

摘要

Using a coupled channel unitary approach, combining the heavy quark spinsymmetry and the dynamics of the local hidden gauge, we investigate themeson-baryon interaction with hidden beauty and obtain several new states of$N^*$ around 11 GeV. We consider the basis of states $\eta_b N$, $\Upsilon N$,$B \Lambda_b$, $B \Sigma_b$, $B^* \Lambda_b$, $B^* \Sigma_b$, $B^* \Sigma_b^*$and find four basic bound states which correspond to $B \Sigma_b$, $B\Sigma_b^*$, $B^* \Sigma_b$ and $B^* \Sigma_b^*$, decaying mostly into $\eta_bN$ and $\Upsilon N$ and with a binding energy about 50-130 MeV with respect tothe thresholds of the corresponding channel. All of them have isospin $I=1/2$,and there are no bound states or resonances in $I=3/2$. The $B \Sigma_b$ stateappears in $J=1/2$, the $B \Sigma_b^*$ in $J=3/2$, the $B^* \Sigma_b$ appearsnearly degenerate in $J=1/2, ~3/2$ and the $B^* \Sigma_b^*$ appears nearlydegenerate in $J=1/2, ~3/2, ~5/2$. These states have a width from $6 \sim 45\mev$ except for the one in $J=5/2$ which has zero width since it cannot decayinto any of the states of the basis chosen.
机译:使用耦合通道unit合方法,结合重夸克自旋对称性和局部隐藏量规的动力学,我们研究了主题子-重子与隐藏美的相互作用,并获得了11 GeV附近的$ N ^ * $几个新状态。我们考虑状态的基础$ \ eta_b N $,$ \ Upsilon N $,$ B \ Lambda_b $,$ B \ Sigma_b $,$ B ^ * \ Lambda_b $,$ B ^ * \ Sigma_b $,$ B ^ * \ Sigma_b ^ * $并找到对应于$ B \ Sigma_b $,$ B \ Sigma_b ^ * $,$ B ^ * \ Sigma_b $和$ B ^ * \ Sigma_b ^ * $的四个基本束缚状态,主要衰减成$ \ eta_bN $和$ \ Upsilon N $,并且相对于相应通道的阈值具有约50-130 MeV的结合能。它们全都具有同位旋$ I = 1/2 $,并且在$ I = 3/2 $中没有束缚状态或共振。 $ B \ Sigma_b $状态出现在$ J = 1/2 $中,$ B \ Sigma_b ^ * $出现在$ J = 3/2 $中,$ B ^ * \ Sigma_b $出现在$ J = 1/2中几乎退化,〜3/2 $和$ B ^ * \ Sigma_b ^ * $在$ J = 1/2,〜3/2,〜5/2 $中几乎退化。这些状态的宽度为$ 6 \ sim 45 \ mev $,但$ J = 5/2 $的宽度为零,因为它不能衰减到所选基准的任何状态。

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  • 作者

    Xiao, C. W.; Oset, E.;

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  • 年度 2013
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  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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