The structure of the Zc(3900) is studied from dynamical lattice simulations of QCD at mπ ≃ 410MeV. The s-wave two-body coupled-channel scatterings in IG(JPC) = 1+(1+-) are carried out on the lattice using the πJ/Ψ-Pn-DD∗ coupled-channel potentials derived from the HAL QCD approach. The calculated invariant mass spectra of the πJ=y and DD∗ show enhancements just above the DD∗ threshold energy due to the strong transition potentials between the πJ=y and DD∗. The poles of the two-body amplitudes are also examined and are found far below the DD∗ threshold energy on the second Riemann sheets, so that the peak corresponding to the Zc(3900) in the invariant mass spectra is naturally explained by not a conventional resonance but a coupled-channel kinematical effects.
|Journal||Proceedings of Science|
|Publication status||Published - 2015|
|Event||33rd International Symposium on Lattice Field Theory, LATTICE 2015 - Kobe, Japan|
Duration: Jul 14 2015 → Jul 18 2015
All Science Journal Classification (ASJC) codes