Speaker
Description
We investigate the dynamical generation of $I=0$ charmonium-like tetraquarks with spin-parity assignments $J^{PC}=0^{++}$, $1^{++}$, $2^{++}$, and $3^{--}$ in the mass range of 3.6 to 4.3 GeV. Using an off-shell coupled-channel formalism, we construct kernel amplitudes from effective Lagrangians that satisfy heavy-quark spin-flavor and chiral symmetries. To isolate states that are purely dynamically generated, we explicitly exclude $s$-channel pole diagrams and focus on $t$- and $u$-channel meson exchanges. By solving the coupled-channel integral equations, we identify six poles in the complex energy plane. We also discuss their physical properties by determining pole positions and extracting channel coupling strengths. Our results indicate the significant role of coupled-channel effects, in particular the $D^*\bar D^*$ channel, in the formation of exotic hadrons.
| Theoretical or experimental | Theoretical |
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