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Chiral SU(3) quark Model Study of Tetraquark states: cn■/cs

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Communications in Theoretical Physics 2008年第2期49卷 414-420页

作者： ZHANG Hai-Xia WANG Wen-Ling DAI Yuan-Ben ZHANG Zong-Ye Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918-4 Beijing 100049 China Institute of Particle Physics Central China Normal University Wuhan 430079 China Institute of Theoretical Physics the Chinese Academy of Sciences P.O. Box 2735 Beijing 100080 China

The new members of the charm-strange family Dsj^＊（2317）, Dsj（2460）, and Ds（2632）, which have the surprising properties, are challenging the present models. Many theoretical interpretations have been devoted to this issue. Most authors suggest that they are not the conventional cs^- quark model states, but possibly are four-quark states, molecule states, or mixtures of a P-wave cs^- and a four-quark state. In this work, we follow the four-quark-state picture, and study the masses of cnn^-s^-/css^-s^- states （n is u or d quark） in the chiral SU（3） quark model. The numerical results show that the mass of the mixed four-quark state （cnn^-s^-/css^-s^-） with spin parity j^P ： 0^＋ might not be Ds （2632）. At the same time, we also conclude that Dsj^＊（2317） and Dsj（2460） cannot be explained as the pure four-quark state.

关键词： four-quark states quark model chiral symmetry

Nature of light scalars through photon-photon collisions

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Chinese Physics C 2010年第6期34卷 807-815页

作者： N.N.Achasov G.N.Shestakov Laboratory of Theoretical Physics Sobolev Institute for Mathematics

The surprising thing is that arising almost 50 years ago from the linear sigma model （LSM） with spontaneously broken chiral symmetry, the light scalar meson problem has become central in the nonperturbative quantum chromodynamics （QCD） for it has been made clear that LSM could be the low energy realization of QCD. First we review briefly signs of four-quark nature of light scalars. Then we show that the light scalars are produced in the two photon collisions via four-quark transitions in contrast to the classic P wave tensor qq mesons that are produced via two-quark transitions γγ→qq. Thus we get new evidence of the four-quark nature of these states.

关键词： linear sigma model light scalar mesons four-quark states two photon production mechanisms

Mixing of X and Y states from QCD sum rules analysis

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Chinese Physics C 2022年第6期46卷 22-35页

作者： Ze-Sheng Chen Zhuo-Ran Huang Hong-Ying Jin T.G.Steele Zhu-Feng Zhang Institute of Modern Physics Department of PhysicsZhejiang UniversityHangzhou 310027China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Department of Physics and Engineering Physics University of SaskatchewanS7N5E2Canada Department of Physics Ningbo UniversityNingbo 315211China

We study QQqq and QqQq states as mixed states in QCD sum *** calculating the two-point correlation functions of pure states of their corresponding currents,we review the mass and coupling constant predictions of J^(PC)=1^(++),1^(--),and 1^(-+)*** calculating the two-point mixed correlation functions of QQqq and QqQq currents,we estimate the mass and coupling constants of the corresponding"physical state"that couples to both QQqq and QqQq *** results suggest that for 1^(++)states,the QQqq and QqQq components are more likely to mix,while for 1^(--)and 1^(-+)states,there is less mixing between QQqq and *** results suggest the Y series of states have more complicated components.

关键词： four-quark states QCD sum rules non-perturbative QCD

Chiral SU(3) quark Model Study of Tetraquark states

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Chiral SU(3) Quark Model Study of Tetraquark States