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Disentangling the nature of resonances in coupled-channel models

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Chinese Physics C 2015年第4期39卷 10-14页

作者：曹须 Institute of Modern Physics Chinese Academy of Sciences Institut für Theoretische Physik Universitat Giessen state Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences

We present severM possible hadronic states found in coupled-channel models within the on-shell approx- imation. The interaction potential is constructed as a sum of the tree-level Feynman diagrams calculated with the effective Lagrangians. Based on the recent empirical data, we illustrate the possible existence of severM baryonic and mesonic states with definite quantum numbers in the model. We give their properties for the purpose of further study and discuss the potential of finding them in future experiments.

关键词： partial wave analysis coupled-channel model exotic state

Is J^(PC)=3^(-+) molecule possible?

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Chinese Physics C 2015年第2期39卷 7-14页

作者：朱伟刘言锐姚涛 School of Physics Shandong University

The confirmation of charged charmonium-like states indicates that heavy quark molecules should exist. Here we discuss the possibility of a molecule state with ^PC=3^-＋. In a one-boson-exchange model investigation for the S wave C=＋ D^＊D2^＊ states, one finds that the strongest attraction is in the case J= 3 and I=0 for both π and σ exchanges. Numerical analysis indicates that this hadronic bound state might exist if a phenomenological cutoff parameter around 2.3 GeV （1.5 GeV） is reasonable with a dipole （monopole） type form factor in the one-pion- exchange model. The cutoff for binding solutions may be reduced to a smaller value once the σ exchange contribution is included. If a state around the D^＊D2^＊ threshold （≈4472 MeV） in the channel J/ψω （P wave） is observed, the heavy quark spin symmetry implies that it is not ace meson and the jPC are likely to be 3^-＋.

关键词： exotic state molecule heavy quark

Possible J^(PC)=0^(+-) exotic states

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Chinese Physics C 2013年第3期37卷 21-33页

作者：杜孟林陈伟陈晓林朱世琳 Department of Physics and state Key Laboratory of Nuclear Physics and Technology Peking University Center of High Energy Physics Peking University

We study possible exotic J^（PC）=0~＋- states using tetraquark interpolating currents with the QCD sum rule approach. The extracted masses are around 4.85GeV for the charmonium-like states and 11.25 GeV for the bottomonium-like states. There is no working region for the light tetraquark currents, which implies that the light 0~＋- state may not exist below 2GeV.

关键词： exotic state QCD sum rule

Experimental review of e+e-→ππhc

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Chinese Physics C 2016年第1期40卷 17-22页

作者：姬清平郭玉萍郭爱强喻纯旭王至勇 Department of Physics Nankai UniversityTianjin 300071China Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45D-55099 MainzGermany Institute of High Energy Physics CASBeijing 100049China

We review the recent BESIII measurement of e＋e-→ππhc in which its line shape is studied between the center-of-mass energies of 3.9 to 4.42 GeV and an iso-vector charmonium-like state Zc（4020） is observed in the invariant mass of 7rhc at the BESIII experiment. The charged Zc（4020）± is the second observed Zc state following Zc（3900）, while the Zc（4020）0 is the first observed neutral Zc state. The line shape of δ（e＋e-→ππhc）is also re-analyzed in view of searching for the Y state and the existence of the Y（4220） state is confirmed and compared with the previous work of the BESIII experiment.

关键词： charmonium exotic state isospin triplet

exotic D_(s)^(*)D^(*) molecular states and scqc tetraquark states with J^(P)=0^(+),1^(+),2^(+)

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Chinese Physics C 2021年第9期45卷 28-43页

作者：王齐男陈伟陈华星 School of Physics Sun Yat-Sen UniversityGuangzhou 510275China School of Physics Southeast UniversityNanjing 210094China

We have calculated the mass spectra for the D_(s)^(*)D^(*) molecular states and scqc tetraquark states with J^(P)=0^(+),1^(+),2^(+).The masses of the axial-vector D_(s)^(*)D^(*),D_(s)^(*)D molecular states and 1_([sc])㊉0_([qc]),0_([sc])©1_([qc])tetraquark states are predicted to be approximately 3.98 GeV,in good agreement with the mass of Z_(cs)(3985)^(-)from BE-SIII.In both the molecular and diquark-antidiquark scenarios,our results suggest that there may exist two almost degenerate states,as the strange partners of X(3872)and Z_(c)(3900).We propose to carefully examine Z_(cs)(3985)in future experiments to verify this.One may also search for more hidden-charm four-quark states with strangeness in not only the open-charm D_(s)^(*)D^(*) channels but also the hidden-charm channels η_(c)K/K^(*),J/ψK/K^(*).

关键词： molecular state exotic state QCD sum rules