The hidden charm pentaquarks are the hidden color-octet uud baryons?

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• 作者：Sachiko Takeuchi^a ; ^c ; ^d ; ^{s.takeuchi@jcsw.ac.jp} ; Makoto Takizawa^b ; ^d ; ^e
• 关键词：Hidden-charm pentaquark ; Color-octet baryon ; Exotic hadron ; Multiquark hadron ; Baryon&ndash ; meson scattering
• 刊名：Physics Letters B
• 出版年：2017
• 出版时间：10 January 2017
• 年：2017
• 卷：764
• 期：Complete
• 页码：254-259
• 全文大小：523 K
• 卷排序：764

文摘

The I(JP)=12(12−), 12(32−), and 12(52−)uudcc‾ pentaquarks are investigated by the quark cluster model. This model, which reproduces the mass spectra of the color-singlet S  -wave q3q3 baryons and qq‾ mesons, also enables us to evaluate the quark interaction in the color-octet uud   configurations. It is shown that the color-octet isospin-12 spin-32uud   configuration gains an attraction. The uudcc‾ states with this configuration have structures around the Σc(⁎)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.