The structure of the tetraquark candidate Zc (3900), which has been experimentally reported in e+e- collisions, is studied by s-wave meson-meson coupled-channel scattering on the lattice. The s-wave interactions among the πJ/φ, ρηc and DD̄∗ channels are derived from (2 + 1)-flavor dynamical QCD simulations at mπ = 410-700MeV. It is found that the interactions are dominated by the off-diagonal πJ/φ-DD̄z.ast; and ρηc-DD̄z.ast; couplings. With the interactions obtained, the s-wave two-body amplitudes and the pole position in πJ/φ-ρηc-DD̄z.ast; coupled-channel scattering are calculated. The results show that Zc (3900) is not a conventional resonance but a threshold cusp. A semiphenomenological analysis with the coupled-channel interaction to the experimentally observed decay mode is also presented to confirm the conclusion.
|Journal||Journal of Physics G: Nuclear and Particle Physics|
|Publication status||Published - Feb 2018|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics