Spin-1 charmonium-like states in QCD sum rule
1 Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
2 Technology and Center of High Energy Physics, Peking University, Beijing 100871, China
We study the possible spin-1 charmonium-like states by using QCD sum rule approach.We calculate the two-point correlation functions for all the local form tetraquark interpolating currents with JPC = 1−− 1−+, 1++ and 1+− and extract the masses of these tetraquark charmonium-like states. The mass of the 1−− qc state is 4.6 ~ 4.7 GeV, which implies a possible tetraquark interpretation for Y(4660) meson. The masses for both the 1++ qc and sc states are 4.0 ~ 4.2 GeV, which is slightly above the mass of X(3872). For the 1−+ and 1+− qc states, the extracted masses are 4.5 ~ 4.7 GeV and 4.0 ~ 4.2 GeV respectively.
© Owned by the authors, published by EDP Sciences, 2012