Heavy pentaquark states and a novel color structure

Abstract

Encouraged by the observation of the pentaquark states $P_c^{+}(4380)$ and $P_c^{+}(4450)$, we propose a novel color flux-tube structure, pentagonal state, for pentaquark states within the framework of color flux-tube mode involving a five-body confinement potential. Numerical results on the heavy pentaquark states indicate that the states with three color flux-tube structures, diquark, octet and pentagonal structures, have the close masses, which can therefore be called QCD isomers analogous to isomers in Chemistry. The pentagonal structure has lowest energy. The state $P_c^{+}(4380)$ can be described as the compact pentaquark state $uudc\bar{c}$ with the pentagonal structure and $J^P={\frac{3}{2}}^{-}$ in the color flux-tube model. The state $P_c^{+}(4450)$ can not be accommodated into the color flux-tube model. The heavy pentaquark states $uudc\bar{b}$, $uudb\bar{c}$ and $uudb\bar{b}$ are predicted in the color flux-tube model. The five-body confinement potential basing on the color flux-tube picture as a collective degree of freedom is a dynamical mechanism in the formation of the compact heavy pentaquark states.

7 pages, 1 figure and 3 tables

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Cited by in corpus (10)

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• Structure and decays of hidden heavy pentaquarks
• Heavy pentaquark spectroscopy in the diquark model
• Investigation of hidden-charm pentaquarks with strangeness $S=-1$
• Hidden charm pentaquark states in a diquark model
• Compact hidden charm pentaquark states and QCD isomers
• The low-lying hidden- and double-charm tetraquark states in a constituent quark model with Instanton-induced Interaction
• The Production of Singly Charmed Pentaquark $\bar{c}qqqq$ from Bottom Baryon
• The ground states of hidden-charm tetraquarks and their radial excitations
• Pentaquark states with hidden charm