title: Fate of the Tetraquark Candidate Z_{c}(3900) from Lattice QCD.
abstract: The possible exotic meson Z_{c}(3900), found in e^{+}e^{-} reactions, is studied by the method of coupled-channel scattering in lattice QCD. The interactions among πJ/ψ, ρη_{c}, and D[over ¯]D^{*} channels are derived from (2+1)-flavor QCD simulations at m_{π}=410-700  MeV. The interactions are dominated by the off-diagonal πJ/ψ-D[over ¯]D^{*} and ρη_{c}-D[over ¯]D^{*} couplings, which indicates that the Z_{c}(3900) is not a usual resonance but a threshold cusp. Semiphenomenological analyses with the coupled-channel interaction are also presented to confirm this conclusion.
authors.affiliation: Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan.|Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198, Japan.
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Ikeda
authors.affiliation: Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan.|Center for Computational Sciences, University of Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Sinya
authors.initials: S
authors.lastname: Aoki
authors.affiliation: Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198, Japan.
authors.forename: Takumi
authors.initials: T
authors.lastname: Doi
authors.affiliation: Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: Shinya
authors.initials: S
authors.lastname: Gongyo
authors.affiliation: Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198, Japan.|iTHES Research Group, RIKEN, Saitama 351-0198, Japan.
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Hatsuda
authors.affiliation: Nihon University, College of Bioresource Sciences, Kanagawa 252-0880, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Inoue
authors.affiliation: Department of Physics and Astronomy, Stony Brook University, New York 11794-3800, USA.
authors.forename: Takumi
authors.initials: T
authors.lastname: Iritani
authors.affiliation: Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan.
authors.forename: Noriyoshi
authors.initials: N
authors.lastname: Ishii
authors.affiliation: Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan.
authors.forename: Keiko
authors.initials: K
authors.lastname: Murano
authors.affiliation: Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan.|Center for Computational Sciences, University of Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Sasaki