The hidden charm pentaquarks are the hidden color-octet uud baryons?
The hidden charm pentaquarks are the hidden color-octet uud baryons?
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DOI：
10.1016/j.physletb.2016.11.034
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发表时间：
2016-08
影响因子：
4.4
通讯作者：
S. Takeuchi;M. Takizawa
中科院分区：
文献类型：
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作者：
S. Takeuchi;M. Takizawa
摘要利用夸克簇模型研究了I (J P)= 1 2（1 2−）、1 2（3 2−）、1 2(5 2−)u u d c c的五夸克形式。该模型再现了彩色单重态s波q3重子和q q介子的质谱，也使我们能够评估彩色八元组态中的夸克相互作用。结果表明，彩色八元体同位旋-1 - 2自旋-3 - 2的构型具有吸引力。具有这种配置的uc c c形式的结构围绕Σ c () d形式的阈值：一个结合状态，两个共振，和一个大尖。我们认为LHCb实验中发现的负宇称五夸克可能是由这些结构给出的。
Abstract The I (J P)= 1 2 (1 2−), 1 2 (3 2−), and 1 2 (5 2−) u u d c c‾ pentaquarks are investigated by the quark cluster model. This model, which reproduces the mass spectra of the color-singlet S-wave q 3 baryons and q q‾ mesons, also enables us to evaluate the quark interaction in the color-octet uud configurations. It is shown that the color-octet isospin-1 2 spin-3 2 uud configuration gains an attraction. The u u d c c‾ states with this configuration have structures around the Σ c (⁎) D‾(⁎) thresholds: one bound state, two resonances, and one large cusp are found. We argue that the negative parity pentaquark found by the LHCb experiments may be given by these structures.