论文标题
确定新观察到的$ξ_b（6227）^0 $状态的可能量子号
Determination of the possible quantum numbers for the newly observed $Ξ_b(6227)^0$ state
论文作者
论文摘要
LHCB合作最近报道了观察到新的激发底部Baryon $ξ_b（6227）^0 $，并宣布了与先前观察到的$ξ_b（6227）^ - $状态相关的测量结果的改进。我们对$ξ_b（6227）^0 $状态进行了分析，将其作为$ξ_b（6227）^ - $ resonance的isospin合作伙伴，可能是$ 1P $或$ 2S $兴奋状态，带有spin $ j = \ frac {3} {2} {2} $。两种可能性的相应质量与实验数据都具有一致的结果，这表明只有质量和规则，就无法对该状态的性质和量子数做出确切的决定。再进一步，还考虑了这些可能的激发状态对$ξ_b^-π^+$最终状态的衰减，并且从光锥总和规则中提取了相关的强耦合常数。获得的衰减宽度值支持$ξ_b（6227）^0 $的可能性，是$ 1p $兴奋的状态$ξ_b（5945）^0 $ baryon。
The LHCb Collaboration recently reported the observation of a new excited bottom baryon $Ξ_b(6227)^0$ and announced an improvement in the measurements related to the previously observed $Ξ_b(6227)^-$ state. We conduct an analysis for $Ξ_b(6227)^0$ state considering it as isospin partner of the $Ξ_b(6227)^-$ resonance and possibly $1P$ or $2S$ excited state with spin $J=\frac{3}{2}$. The corresponding masses for both possibilities have consistent results with the experimental data, indicating that only with the mass sum rules, one can not make exact decision on the nature and quantum numbers of this state. To go further, the decays of these possible excited states to $Ξ_b^- π^+$ final state are also considered and the relevant strong coupling constants are extracted from the light cone sum rules. The obtained decay width values support the possibility of $Ξ_b(6227)^0$ to be the $1P$ excited state of $Ξ_b(5945)^0$ baryon.
