A possible meaning of boson-description for the collective motion of nuclei as a fermion system is discussed.It is shown that the use of boson-description comes out naturally from the requirement of independent separa...A possible meaning of boson-description for the collective motion of nuclei as a fermion system is discussed.It is shown that the use of boson-description comes out naturally from the requirement of independent separation of the collective degrees of freedom of nuclei.展开更多
Using an extended chromomagnetic model,we perform a systematic study of the masses of doubly heavy tetraquarks.We find that the ground states of the doubly heavy tetraquarks are dominated by the color-triplet ■config...Using an extended chromomagnetic model,we perform a systematic study of the masses of doubly heavy tetraquarks.We find that the ground states of the doubly heavy tetraquarks are dominated by the color-triplet ■configuration,which is opposite to that of fully heavy tetraquarks.The combined results suggest that the color-triplet configuration becomes more important when the mass difference between the quarks and antiquarks increases.We find three stable states that lie below the thresholds of two pseudoscalar mesons.They are the I^(P)=01^(+)nnbb tetraquark,I^(P)=1^(+)nncb tetraquark,and J^(P)=1^(+)nsbb tetraquark.展开更多
We study the fine splitting in the charmomium spectrum in the quark model with the channel coupling effect, including DD, DD＊, D＊D＊ and DsDs, DsDs＊, Ds＊Ds＊ channels. The interaction for channel coupling is const...We study the fine splitting in the charmomium spectrum in the quark model with the channel coupling effect, including DD, DD＊, D＊D＊ and DsDs, DsDs＊, Ds＊Ds＊ channels. The interaction for channel coupling is constructed from the current-current Lagrangian related to the color confinement and the onegluon exchange potentials. By adopting the massive gluon propagator from the lattice cMculation in the nonperturbative region, the coupling interaction is further simplified to four-fermion interaction. The numerical calculation still prefers the assignment 1＋＋ of X（3872）.展开更多
Based on an extended NJL model including heavy quark flavors, we calculate the form factors of pseudoscalar and vector mesons. After taking into account the vector-meson-dominance effect, which introduces a form facto...Based on an extended NJL model including heavy quark flavors, we calculate the form factors of pseudoscalar and vector mesons. After taking into account the vector-meson-dominance effect, which introduces a form factor correction to the quark vector coupling vertices, the form factors and electric radii of π^＋ and K^＋ pseudo-scalar mesons in the light flavor sector fit the experimental data well. The magnetic moments of the light vector mesons ρ^＋and K^＊＋are comparable with other theoretical calculations. The form factors in the light-heavy flavor sector are presented to compare with future experiments or other theoretical calculations.展开更多
We study the possible tetraquark interpretation of light scalar meson states ao（980）, f0（980）,k, within the framework of the non-relativistic potential model. The wave functions of tetraquark states are obtained ...We study the possible tetraquark interpretation of light scalar meson states ao（980）, f0（980）,k, within the framework of the non-relativistic potential model. The wave functions of tetraquark states are obtained in a space spanned by multiple Gaussian functions. We find that the mass spectra of the light scalar mesons can be well accommodated in the tetraquark picture if we introduce a three-body quark interaction in the quark model. Using the obtained multiple Gaussian wave functions, the decay constants of tetraquarks are also calculated within the ＂fall apart＂ mechanism.展开更多
The Babar Collaboration announced two new excited charmed baryons c（3055）^＋ and c（3123）^＋. We study their strong decays assuming they are D-wave states. Some assignments are excluded by comparing our numerical...The Babar Collaboration announced two new excited charmed baryons c（3055）^＋ and c（3123）^＋. We study their strong decays assuming they are D-wave states. Some assignments are excluded by comparing our numerical results with the experimental values of the total widths of c（3055）^＋ and c（3123）^＋. We also suggest some possible decay modes, which will be helpful to determine the properties of c（3055）^＋ and c（3123）^＋.展开更多
Some charmonium-like resonances such as X（3872） can be interpreted as possible D （＊） （＊） molecular states.Within the quark model,we study the structure of such molecular states and the similar B （＊） （＊...Some charmonium-like resonances such as X（3872） can be interpreted as possible D （＊） （＊） molecular states.Within the quark model,we study the structure of such molecular states and the similar B （＊） （＊） molecular states by taking into account the light meson exchange （π,η,ρ,ω and σ） between two light quarks from different mesons.展开更多
The recently observed X（3872） resonance, which is difficult to assign a conventional cc charmonium state in the quark model, may be interpreted as a molecular state. Such a molecular state is a hidden flavor four qu...The recently observed X（3872） resonance, which is difficult to assign a conventional cc charmonium state in the quark model, may be interpreted as a molecular state. Such a molecular state is a hidden flavor four quark state because of its charmonium-like quantum numbers. The s-channel one gluon exchange is an interaction which only acts in the hidden flavor multi-quark system. In this paper, we will study the X（3872） and other similiar hidden flavor molecular states in a quark model by taking into account the s-channel one gluon exchange interaction.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.19775003。
文摘A possible meaning of boson-description for the collective motion of nuclei as a fermion system is discussed.It is shown that the use of boson-description comes out naturally from the requirement of independent separation of the collective degrees of freedom of nuclei.
基金Supported by the National Natural Science Foundation of China(NSFC)(11975033,12070131001)。
文摘Using an extended chromomagnetic model,we perform a systematic study of the masses of doubly heavy tetraquarks.We find that the ground states of the doubly heavy tetraquarks are dominated by the color-triplet ■configuration,which is opposite to that of fully heavy tetraquarks.The combined results suggest that the color-triplet configuration becomes more important when the mass difference between the quarks and antiquarks increases.We find three stable states that lie below the thresholds of two pseudoscalar mesons.They are the I^(P)=01^(+)nnbb tetraquark,I^(P)=1^(+)nncb tetraquark,and J^(P)=1^(+)nsbb tetraquark.
基金Supported by National Natural Science Foundation of China (10675008)
文摘We study the fine splitting in the charmomium spectrum in the quark model with the channel coupling effect, including DD, DD＊, D＊D＊ and DsDs, DsDs＊, Ds＊Ds＊ channels. The interaction for channel coupling is constructed from the current-current Lagrangian related to the color confinement and the onegluon exchange potentials. By adopting the massive gluon propagator from the lattice cMculation in the nonperturbative region, the coupling interaction is further simplified to four-fermion interaction. The numerical calculation still prefers the assignment 1＋＋ of X（3872）.
文摘Based on an extended NJL model including heavy quark flavors, we calculate the form factors of pseudoscalar and vector mesons. After taking into account the vector-meson-dominance effect, which introduces a form factor correction to the quark vector coupling vertices, the form factors and electric radii of π^＋ and K^＋ pseudo-scalar mesons in the light flavor sector fit the experimental data well. The magnetic moments of the light vector mesons ρ^＋and K^＊＋are comparable with other theoretical calculations. The form factors in the light-heavy flavor sector are presented to compare with future experiments or other theoretical calculations.
文摘We study the possible tetraquark interpretation of light scalar meson states ao（980）, f0（980）,k, within the framework of the non-relativistic potential model. The wave functions of tetraquark states are obtained in a space spanned by multiple Gaussian functions. We find that the mass spectra of the light scalar mesons can be well accommodated in the tetraquark picture if we introduce a three-body quark interaction in the quark model. Using the obtained multiple Gaussian wave functions, the decay constants of tetraquarks are also calculated within the ＂fall apart＂ mechanism.
基金National Natural Science Foundation of China(10421503,10625521,10705001)China Postdoctoral Science Foundation(20060400376)
文摘The Babar Collaboration announced two new excited charmed baryons c（3055）^＋ and c（3123）^＋. We study their strong decays assuming they are D-wave states. Some assignments are excluded by comparing our numerical results with the experimental values of the total widths of c（3055）^＋ and c（3123）^＋. We also suggest some possible decay modes, which will be helpful to determine the properties of c（3055）^＋ and c（3123）^＋.
文摘Some charmonium-like resonances such as X（3872） can be interpreted as possible D （＊） （＊） molecular states.Within the quark model,we study the structure of such molecular states and the similar B （＊） （＊） molecular states by taking into account the light meson exchange （π,η,ρ,ω and σ） between two light quarks from different mesons.
文摘The recently observed X（3872） resonance, which is difficult to assign a conventional cc charmonium state in the quark model, may be interpreted as a molecular state. Such a molecular state is a hidden flavor four quark state because of its charmonium-like quantum numbers. The s-channel one gluon exchange is an interaction which only acts in the hidden flavor multi-quark system. In this paper, we will study the X（3872） and other similiar hidden flavor molecular states in a quark model by taking into account the s-channel one gluon exchange interaction.
