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Doubly charmed pentaquarks

机译:双重迷人的pentaquarks.

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The LHCb collaboration, using its full data set from runs 1 and 2, announced in 2019 a surprising update of the hidden-charm pentaquark states P c ( 4380 ) + and P c ( 4450 ) + , observed in 2015. A new state, P c ( 4312 ) + , was clearly seen at lower energies; furthermore, the original P c ( 4450 ) resonance was resolved into two individual states, named the P c ( 4440 ) + and the P c ( 4457 ) + . Motivated by the fact that these new hidden-charm pentaquark states were successfully predicted by our chiral quark model, we extend herein such study to the doubly charmed sector. The analyzed total spin and parity quantum numbers are J P = 1 2 ? , 3 2 ? and 5 2 ? , in the I = 1 2 and 3 2 isospin channels. We find several possible narrow baryon-meson resonances (theoretical masses in parenthesis): I J P = 1 2 1 2 ? Σ c D ( 4356 ) , 1 2 3 2 ? Σ c * D ( 4449 ) , 3 2 1 2 ? Σ c D ( 4431 ) , 3 2 1 2 ? Σ c D ( 4446 ) , 3 2 3 2 ? Σ c D * ( 4514 ) and 3 2 5 2 ? Ξ c c * ρ ( 4461 ) whose widths are 4.8, 8.0, 2.6, 2.2, 4.0 and 3.0?MeV, respectively. Moreover, one shallow bound state is found, too, with quantum numbers I J P = 1 2 3 2 ? Ξ c c * π ( 3757 ) . These doubly charmed pentaquark states are expected to be identified in future experiments.
机译:LHCB协作,使用其从运行1和2的完整数据集,2019年宣布的隐藏式魅力Pentaquark状态P C(4380)+和P C(4450)+的令人惊讶的更新,在2015年观察到。新状态,在较低的能量下清楚地看到P C(4312)+;此外,原始的P C(4450)谐振被解析为两个单独的状态,命名为P C(4440)+和P C(4457)+。由于我们的手性夸克模型成功预测了这些新的隐藏魅力五群教出版物,我们在此延伸到双重迷人的行业的研究。分析的总旋转和奇偶校验量子数为j p = 1 2? ,3 2?和5 2? ,在i = 1 2和3 2个旋转孔通道中。我们发现几种可能的狭窄的Baryon-Meson共振(括号中的理论肿块):I J P = 1 2 1 2? σcd(4356),1 2 3 2? ΣC* d(4449),3 2 1 2? σcd(4431),3 2 1 2? σcd(4446),3 2 3 2? σcd *(4514)和3 2 5 2? ξCC *ρ(4461)分别为4.8,8.0,2.6,2.2,4.0和3.0?mev。此外,还发现了一种浅界状态,量子数I j p = 1 2 3 2? ξCc *π(3757)。这些双重迷人的五角形国家预计将在未来的实验中被识别。

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