molecule interpretation of

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

doi:10.1140/epjc/s10052-014-2773-y

EPJ

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2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2014) 74: 2773
https://doi.org/10.1140/epjc/s10052-014-2773-y

Regular Article - Theoretical Physics

$D^\bar{D}^$ molecule interpretation of

Wei Chen¹^*, T. G. Steele¹, Meng-Lin Du² and Shi-Lin Zhu²

¹ Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK, S7N 5E2, Canada
² Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China

^* e-mail: wec053@mail.usask.ca

Received: 10 December 2013
Accepted: 5 February 2014
Published online: 20 February 2014

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 $\alpha _s$ . The extracted mass is $m_X=(4.04\pm 0.24)$ 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: $m_{Z_b}=(9.98\pm 0.21)$ GeV.