The qqsQ(q=u,d;Q=c,b)tetraquark system in a chiral quark model  

作　　者：杨刚 平加伦 Jorge Segovia Gang Yang;Jialun Ping;Jorge Segovia(Department of Physics,Zhejiang Normal University,Jinhua 321004,China;Department of Physics and Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems,Nanjing Normal University,Nanjing 210023,China;Departamento de Sistemas Físicos,Químicos y Naturales,Universidad Pablo de Olavide,E-41013 Sevilla,Spain)

机构地区：[1]Department of Physics,Zhejiang Normal University,Jinhua 321004,China [2]Department of Physics and Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems,Nanjing Normal University,Nanjing 210023,China [3]Departamento de Sistemas Físicos,Químicos y Naturales,Universidad Pablo de Olavide,E-41013 Sevilla,Spain

出　　处：《Chinese Physics C》2024年第7期84-105,共22页中国物理C（英文版）

基　　金：supported by the National Natural Science Foundation of China(12305093,11535005,11775118);the Natural Science Foundation of Zhejiang Province,China(LQ22A050004);the Ministerio Español de Ciencia e Innovación(PID2019-107844GB-C22,PID2022-140440NB-C22);the Junta de Andalucía under contract Nos.Operativo FEDER Andalucía(2014-2020 UHU-1264517,P18-FR-5057 and also PAIDI FQM-370)。

摘　　要：The S-wave qqsQ(q=u,d;Q=c,b)tetraquarks,with spin-paritiesJ^(P)=0^(+),1^(+),and 2^(+),in both isoscalar and isovector sectors,are systematically studied using a chiral quark model.The meson-meson,diquark-antidiquark,and K-type arrangements of quarks and all possible color wave functions are comprehensively considered.The four-body system is solved using the Gaussian expansion method,a highly efficient computational approach.Additonally,a complex-scaling formulation of the problem is established to disentangle bound,resonance,and scattering states.This theoretical framework has already been successfully applied in various tetra-and penta-quark systems.For the complete coupled channel and within the complex-range formulation,several narrow resonances of qqsC and qqsb systems are obtained,in each allowed I(J^(P))-channel,within the energy regions of 2.4-3.4 GeV and 5.7-6.7GeV,respectively.The predicted exotic states,which indicate a richer color structure when going towards multiquark systems beyond mesons and baryons,are expected to be confirmed in future high-energy particle and nuclear experiments.

关 键 词：quantum chromodynamics quark models 

分 类 号：O572.33[理学—粒子物理与原子核物理]