1305.0244 (Wei Chen et al.)

QCD Sum-Rule Interpretation of X(3872) with $J^{PC}=1^{++}$ Mixtures of
Hybrid Charmonium and $\bar D D^*$ Molecular Currents    [PDF]

Wei Chen, Hong-ying Jin, R. T. Kleiv, T. G. Steele, Meng Wang, Qing Xu

QCD sum-rules are employed to determine whether the X(3872) can be described as a mixed state that couples to $J^{PC}=1^{++}$ charmonium hybrid and $\bar D D^*$ molecular currents. After calculating the mixed correlator of hybrid and molecular currents, we formulate the sum-rule in terms of a mixing parameter that interpolates between the pure molecular and hybrid scenarios. As the mixing parameter is increased from the pure molecular case, the predicted mass increases until it reaches a maximum value in good agreement with the X(3872) and the resulting sum-rule analysis appears more robust than the pure molecular case.

View original: http://arxiv.org/abs/1305.0244