Isospin eigenstates of the color singlet-singlet-type pentaquark states  

作　　者：Xiu-Wu Wang Zhi-Gang Wang Guo-Liang Yu Qi Xin 

机构地区：[1]Department of Physics,North China Electric Power University,Baoding 071003,China [2]School of Nuclear Science and Engineering,North China Electric Power University,Beijing 102206,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2022年第9期44-51,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.12175068);the Youth Foundation of North China Electric Power University(NCEPU)(Grant No.93209703)。

摘　　要：In this study,we constructed color singlet-singlet-type five-quark currents with isospins(I,I_(3))=(1/2,1/2)and(3/2,1/2)unambiguously to explore theDΣ_(c),DΣ^(∗)_(c),¯D∗Σc,andD^(∗)Σ^(∗)_(c)pentaquark states via the quantum chromodynamics sum rules for the first time,where¯D,Σc,···represent the color singlet clusters with the same quantum numbers as the corresponding physical mesons or baryons.The numerical results support assigning P_(c)(4312),P_(c)(4380),P_(c)(4440),and P_(c)(4457)as theDΣ_(c),DΣ^(∗)_(c),¯D∗Σc,andD^(∗)Σ^(∗)_(c)pentaquark states,respectively,with the isospin I=1/2.The correspondingDΣ_(c),DΣ^(∗)_(c),¯D∗Σc,andD^(∗)Σ^(∗)_(c)pentaquark states with the isospin I=3/2 have slightly larger masses.The observations of the high pentaquark candidates in the J=Δinvariant mass spectrum would shed light on the nature of the P_(c)states and contribute in distinguishing the scenarios of the color antitriplet-antitriplet-antitriplet-type and color singlet-singlet-type pentaquark states.

关 键 词：pentaquark states hadronic molecule QCD sum rules 

分 类 号：O572.33[理学—粒子物理与原子核物理]