| Popis: |
We discuss the lattice QCD simulations that search for the Zc+ with the unconventional quark content c¯cd¯u in the channel IG(JPC) = 1+(1+−). The major challenge is due to the two-meson states J/Ψπ, Ψ2Sπ, Ψ1Dπ, DD¯*, D*D¯*, ηcρ that are also inevitably present in this channel. The available lattice simulations find expected two-meson eigenstates, but no additional eigenstate as a candidate for Zc+. This is in a striking contrast to the lattice results in the flavour non-exotic channels, where additional states are found in relation to most of the known resonances and bound states. |
