Heavy-quark symmetry partners of the Pc(4450) pentaquark
Heavy-quark symmetry partners of the Pc(4450) pentaquark
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DOI：
10.1103/physrevd.98.114030
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发表时间：
2018-11
影响因子：
5
通讯作者：
Ming-Zhu Liu;Fang-Zheng Peng;M. S. Sánchez;M. Valderrama
中科院分区：
文献类型：
--
作者：
Ming-Zhu Liu;Fang-Zheng Peng;M. S. Sánchez;M. Valderrama
重强子分子的光谱受重夸克对称性的制约，表现形式各不相同。例如，重夸克自旋对称性连接了重强子的基态和激发态的性质，而重反夸克-双夸克对称性连接了重反时间子(D‘，D*)和双重重子(Ξcc，Ξcc*)的性质。对这些对称性的预测是，如果Pc(4450)确实是D‘*Σc束缚态，那么应该有一系列D’*Σc*，ΞccΣc，Ξcc*Σc，ΞccΣc*和Ξcc*Σc*伙伴。重夸克自旋对称性的具体应用表明，如果Pc(4450)是一个32维*Σc分子，则可能存在一个具有相似结合能的52-D‘*Σc*配对--我们称其为Pc(4515)，因为它的预期质量。相反，重反夸克-双夸克对称性的应用表明，0+ΞccΣc，1+ΞccΣc*，2+Ξcc*Σc和3+Ξcc*Σc*分子也可能结合，结合能在20-30 MeV范围内。
The spectrum of heavy-hadron molecules is constrained by heavy-quark symmetry in its different manifestations. Heavy-quark spin symmetry for instance connects the properties of the ground and excited states of heavy hadrons, while heavy-antiquark-diquark symmetry connects the properties of heavy antimesons (D¯, D¯*) and doubly heavy baryons (Ξcc, Ξcc*). A prediction of these symmetries is that if the Pc(4450) is indeed a D¯*Σc bound state, then there should be a series of D¯*Σc*, ΞccΣc, Ξcc*Σc, ΞccΣc* and Ξcc*Σc* partners. The concrete application of heavy-quark spin symmetry indicates that, if the Pc(4450) is a 32- D¯*Σc molecule, the existence of a 52- D¯*Σc* partner with similar binding energy—which we call Pc(4515), given its expected mass—is likely. Conversely, the application of heavy-antiquark-diquark symmetry indicates that the 0+ ΞccΣc, 1+ ΞccΣc*, 2+ Ξcc*Σc and 3+ Ξcc*Σc* molecules are likely to bind too, with binding energies in the 20–30 MeV range.