Possibility of kaon-condensed phase in hyperon-mixed matter is considered as high-density multistrangeness system,which may be realized in neutron stars.The interaction model is based on chiral symmetry for kaon-baryo...Possibility of kaon-condensed phase in hyperon-mixed matter is considered as high-density multistrangeness system,which may be realized in neutron stars.The interaction model is based on chiral symmetry for kaon-baryon and kaon-kaon interactions,being combined with the relativistic mean-field theory for two-body baryonbaryon(B-B)interaction.In addition,the Lorentz invariant forms of many-baryon repulsive force(MBR)and threenucleon attractive force(TNA)are phenomenologically introduced,where unknown parameters are fixed to satisfy the saturation properties of symmetric nuclear matter and the causality condition that the sound velocity should be less than the speed of light.It is shown that the equation of state with kaon condensation in hyperon-mixed matter is stiff enough to be consistent with recent observations of massive neutron stars.展开更多
In this article, we test the nature of X（3872）, which is assumed to be a P-wave [cq]-scalar-diquark [cq]- axial-vector-antidiquark tetraquark state with JP = 2^-. The interpolating current representing the JP = 2^- ...In this article, we test the nature of X（3872）, which is assumed to be a P-wave [cq]-scalar-diquark [cq]- axial-vector-antidiquark tetraquark state with JP = 2^-. The interpolating current representing the JP = 2^- state is proposed. Technically, contributions of the operators up to dimension six are included in the operator product expansion. The mass obtained for such state is m2- = （4.38±0.15） GeV. We conclude that it is impossible to describe the X（3872） structure as JV = 2^- tetraauark state.展开更多
The QCD sum rule approach is used to analyze the nature of the recently observed new resonance X （4350）, which is assumed to be a diquark-antidiquark state [cs][cs] with jPC = 1-＋. The interpolating current represe...The QCD sum rule approach is used to analyze the nature of the recently observed new resonance X （4350）, which is assumed to be a diquark-antidiquark state [cs][cs] with jPC = 1-＋. The interpolating current representing this state is proposed. In the calculation, contributions of operators up to dimension six are included in the operator product expansion （OPE）, as well as terms which are linear in the strange quark mass ms. We find ml-＋ = （4.82 ~ 0.19） GeV, which is not compatible with the X（4350） structure as a 1-＋ tetraquark state. Finally, we also discuss the difference of a four-quark state＇s mass whether the state＇s interpolating current has a definite charge conjugation.展开更多
文摘Possibility of kaon-condensed phase in hyperon-mixed matter is considered as high-density multistrangeness system,which may be realized in neutron stars.The interaction model is based on chiral symmetry for kaon-baryon and kaon-kaon interactions,being combined with the relativistic mean-field theory for two-body baryonbaryon(B-B)interaction.In addition,the Lorentz invariant forms of many-baryon repulsive force(MBR)and threenucleon attractive force(TNA)are phenomenologically introduced,where unknown parameters are fixed to satisfy the saturation properties of symmetric nuclear matter and the causality condition that the sound velocity should be less than the speed of light.It is shown that the equation of state with kaon condensation in hyperon-mixed matter is stiff enough to be consistent with recent observations of massive neutron stars.
基金Supported by the National Natural Science Foundation of China under Grant Nos. 10975184,11047117,11105222,and 11105223
文摘In this article, we test the nature of X（3872）, which is assumed to be a P-wave [cq]-scalar-diquark [cq]- axial-vector-antidiquark tetraquark state with JP = 2^-. The interpolating current representing the JP = 2^- state is proposed. Technically, contributions of the operators up to dimension six are included in the operator product expansion. The mass obtained for such state is m2- = （4.38±0.15） GeV. We conclude that it is impossible to describe the X（3872） structure as JV = 2^- tetraauark state.
基金Supported by the National Natural Science Foundation of China under Grant Nos.11347174,11275268,11105222,and 11025242
文摘The QCD sum rule approach is used to analyze the nature of the recently observed new resonance X （4350）, which is assumed to be a diquark-antidiquark state [cs][cs] with jPC = 1-＋. The interpolating current representing this state is proposed. In the calculation, contributions of operators up to dimension six are included in the operator product expansion （OPE）, as well as terms which are linear in the strange quark mass ms. We find ml-＋ = （4.82 ~ 0.19） GeV, which is not compatible with the X（4350） structure as a 1-＋ tetraquark state. Finally, we also discuss the difference of a four-quark state＇s mass whether the state＇s interpolating current has a definite charge conjugation.
