论文标题
激发$ω_b$信号的解释
Interpretation of excited $Ω_b$ signals
论文作者
论文摘要
最近，LHCB报告了四个非常狭窄的激发$ω_b$ baryons腐烂到$ξ_b^0 k^ - $。我们将这些重子解释为$ b $ quark和$ p $ - 波$ ss $ -diquark的界限。对于这种系统，旋转和轨道角动量的恰好有五种可能的组合。我们预测自旋1/2中的两个，两个自旋3/2，一个旋转5/2，全部为负相数。我们赞成将观察到的状态识别为那些旋转1/2和3/2的状态，并为具有旋转5/2的一个状态提供一系列预测质量。我们根据LHCB报告的五个狭窄的激发$ω_c$状态来更新对这些状态的早期预测。 $ j = 1/2 $中的一个的替代图片非常广泛，因此LHCB看不到。
Recently LHCb reported the discovery of four extremely narrow excited $Ω_b$ baryons decaying into $Ξ_b^0 K^-$. We interpret these baryons as bound states of a $b$-quark and a $P$-wave $ss$-diquark. For such a system there are exactly five possible combinations of spin and orbital angular momentum. We predict two of spin 1/2, two of spin 3/2, and one of spin 5/2, all with negative parity. We favor identifying the observed states as those those with spins 1/2 and 3/2, and give a range of predicted masses for the one with spin 5/2. We update earlier predictions for these states based on the five narrow excited $Ω_c$ states reported by LHCb. An alternative picture of the states in which one of $J=1/2$ is extremely wide and hence not seen by LHCb is discussed.
