$$D^*\bar{D}^*$$ D ∗ D ¯ ∗ molecule interpretation of $$Z_c(4025)$$ Z c ( 4025 )

Wei Chen, T. G. Steele, Meng-Lin Du, Shi-Lin Zhu
2014 European Physical Journal C: Particles and Fields  
We have used QCD sum rules to study the newly observed charged state Z_c(4025) as a hidden-charm D^*D̅^* molecular state with the quantum numbers I^G(J^P)=1^+(1^+). Using a D^*D̅^* 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±0.24) GeV. This result is compatible with the observed mass of Z_c(4025) within the errors, which implies a possible molecule
more » ... terpretation of this new resonance. We also predict the mass of the corresponding hidden-bottom B^*B̅^* molecular state: m_Z_b=(9.98±0.21) GeV.
doi:10.1140/epjc/s10052-014-2773-y fatcat:4oz5rx4jb5ga3o77lwqb5laz6e