Heavy pentaquark states and a novel color structure

作者：Deng, Chengrong; Ping, Jialun^*; Huang, Hongxia; Wang, Fan

来源：PHYSICAL REVIEW D, 2017, 95(1): 014031.

DOI：10.1103/PhysRevD.95.014031

• MODEL

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 (c) over bar with the pentagonal structure and J(P)=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 (b) over bar, uudb (c) over bar and uudb (b) over bar 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.

• 出版日期2017-1-30
• 单位重庆交通大学; 南京大学; 南京师范大学