Narrow Results

Many new states in the charmonium mass region were recently discovered by the BaBar, Belle and CDF Collaborations. We use the QCD Sum Rule approach to study the possible structure of some of these states.

The form factor and the coupling constant of the vertex J/ψD_s D_s was calculated using the QCD Sum Rules. We have considered the cases where the J/ψ and D_s mesons are off-shell.

In this talk, we give a brief review of our work studying the possibility of Σ_c(2800) and Λ_c(2940)⁺ as S-wave D^(*)N molecular states from QCD sum rules.

In this article, we take the tensor currents to interpolate the P-wave spin-singlet heavy quarkonium states h_Q, and study the masses and decay constants with the Borel sum rules and moments sum rules. The masses and decay constants from the Borel sum rules and moments sum rules are consistent with each other, the masses are also consistent with the experimental data. The heavy quarkonium states h_Q couple potentially to the tensor currents , and have the quark structure ϵ^ijkξ^†σ^kζ besides the quark structure .