L. Y. Dai, Meng Shi, Guang-Yi Tang, H. Q. Zheng
A careful analysis is made in studying X(4260) property by fitting $J/\psi\pi^+\pi^-$ and $\pi^+\pi^-$ invariant mass spectrum. For the latter final state theorem for $\pi\pi$, $K\bar K$ couple channel system is used. As a consequence the ratio $g^2_{XJ/\psi\sigma} /g^2_{XJ/\psi f_0(980)}$ is estimated. Meanwhile we get a sizable coupling between X and $\omega\chi_{c0}$. Our analysis suggests that the X(4260) resonance is a conventional $\bar c c$ state strongly renormalized by $\omega\chi_{c0}$ continuum and the wave function renormalization constant is estimated to be $Z_X\simeq 0.67$. The renormalization effect is very important in reducing the leptonic decay width of X(4260) and to escape from the existing experimental constraint.
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http://arxiv.org/abs/1206.6911
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