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arXiv · 1308.5060

$D^*\bar D^*$ molecule interpretation of $Z_c(4025)$

Wei Chen·T. G. Steele·Meng-Lin Du·Shi-Lin Zhu
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Abstract

We have used QCD sum rules to study the newly observed charged state $Z_c(4025)$ as a hidden-charm $D^*\bar D^*$ molecular state with the quantum numbers $I^G(J^{P})=1^+(1^{+})$. Using a $D^*\bar D^*$ molecular interpolating current, we have calculated the two-point correlation function and the spectral density up to dimension eight at leading order in $α_s$. The extracted mass is $m_X=(4.04\pm0.24)$ GeV. This result is compatible with the observed mass of $Z_c(4025)$ within the errors, which implies a possible molecule interpretation of this new resonance. We also predict the mass of the corresponding hidden-bottom $B^*\bar B^*$ molecular state: $m_{Z_b}=(9.98\pm0.21)$ GeV.

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Wei Chen, T. G. Steele, Meng-Lin Du, Shi-Lin Zhu. 2014-02-18. $D^*\bar D^*$ molecule interpretation of $Z_c(4025)$. https://doi.org/10.1140/epjc%2Fs10052-014-2773-y

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