Llanes Estrada, Felipe JoséGeneral, Ignacio J.Wang, PingCotanch, Stephen R.2023-06-202023-06-202007-09-300370-269310.1016/j.physletb.2007.08.015https://hdl.handle.net/20.500.14352/50793© 2007 Elsevier B.V. This work was supported in part by grants FPA 2004-02602, 2005-02327, PR27/05-13955-BSCH (Spain) and US DOE DEFG02 97ER41048 and DE-FG02-03ER41260 .Highlights in the search for nonconventional (non-q.q) meson states are the π1(1400) and π1(1600) exotic candidates. Should they exist, mounting theoretical arguments suggest that they are tetraquark molecular resonances excitable by meson rescattering.We report a new tetraquark calculation within a model field theory approximation to Quantum Chromodynamics in the Coulomb gauge supporting this conjecture. We also strengthen this claim by consistentlycontrasting results with exotic state predictions for hybrid (q . qg) mesons within the same theoretical framework. Our findings confirm that molecular like configurations involving two color singlets (a resonance, not a bound state) are clearly favored over hybrid or color-exotic tetraquark meson (q . qq.q atoms) formation. Finally, to assist needed further experimental searches we document a useful off-plane correlator for establishing the structure of these exotic systems along with similar, but anticipated much narrower, states that should exist in the charmonium and bottomonium spectra.engjournal articlehttp://dx.doi.org/10.1016/j.physletb.2007.08.015http://arxiv.org/abs/0707.1286http://www.sciencedirect.comopen access53Q2QBar2 MesonsHybridModelHadronsFísica (Física)22 Física