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,a...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.展开更多
The constituent quark model is used to compute the ground and excited state masses of QQQ baryons containing either c or b quarks.The quark model parameters previously used to describe the properties of charmonium and...The constituent quark model is used to compute the ground and excited state masses of QQQ baryons containing either c or b quarks.The quark model parameters previously used to describe the properties of charmonium and bottomonium states were used in this analysis.The non-relativistic three-body bound state problem is solved by means of the Gaussian expansion method which provides sufficient accuracy and simplifies the subsequent evaluation of the matrix elements.Several low-lying states with quantum numbers J^P=1/2^±,3/2^±,5/2^±and 7/2^+are reported.We compare the results with those obtained by the other theoretical formalisms.There is a general agreement for the mass of the ground state in each sector of triply heavy baryons.However,the situation is more puzzling for the excited states,and appropriate comments about the most relevant features of our comparison are given.展开更多
基金supported by the National Natural Science Foundation of China(12305093,11535005,11775118)the Natural Science Foundation of Zhejiang Province,China(LQ22A050004)+1 种基金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)。
文摘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.
基金Supported by China Postdoctoral Science Foundation(2019M650617)National Natural Science Foundation of China(11535005,11775118)+2 种基金Spanish Ministerio de Economía,Industria y Competitividad under contracts no.FPA2017-86380-P and FPA2016-77177-C2-2-P.P.G.O.the financial support from Spanish MINECO’s Juan de la Cierva-Incorporación programmeGrant Agreement No.IJCI-2016-28525
文摘The constituent quark model is used to compute the ground and excited state masses of QQQ baryons containing either c or b quarks.The quark model parameters previously used to describe the properties of charmonium and bottomonium states were used in this analysis.The non-relativistic three-body bound state problem is solved by means of the Gaussian expansion method which provides sufficient accuracy and simplifies the subsequent evaluation of the matrix elements.Several low-lying states with quantum numbers J^P=1/2^±,3/2^±,5/2^±and 7/2^+are reported.We compare the results with those obtained by the other theoretical formalisms.There is a general agreement for the mass of the ground state in each sector of triply heavy baryons.However,the situation is more puzzling for the excited states,and appropriate comments about the most relevant features of our comparison are given.
