The confirmation of charged charmonium-like states indicates that heavy quark molecules should exist.Here we discuss the possibility of a molecule state with JPC =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-pionexchange 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*-D*2 threshold (≈4472 MeV) in the channel J/ψω (P wave) is observed,the heavy quark spin symmetry implies that it is not a c-c meson and the JPc are likely to be 3-+.
exotic statemoleculeheavy quark
ZHU Wei、LIU Yan-Rui、YAO Tao
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School of Physics, Shandong University, Shandong 250100, China
National Natural Science Foundation of ChinaShandong Province Natural Science FoundationSRF for ROCS,SEM,and Independent Innovation Foundation of Shandong University
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