https://doi.org/10.1051/epjconf/202431400011
Scattering of mesons and emergence of tetraquarks in two-dimensional QCD
Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
* e-mail: hagop.sazdjian@ijclab.in2p3.fr
Published online: 10 December 2024
Scattering of two mesons is considered in the framework of twodimensional QCD in the large-Nc limit with four different quark flavors. The scattering takes place through two coupled channels, corresponding to direct and quark-exchange processes, which are of order O(Nc-2) and O(Nc-1), respectively. Finiteness of the scattering amplitudes to order Nc-2 is pointed out. The theory reduces, at low energies, to an effective theory of mesons, interacting by a quark-exchange process, by means of a contact term. The unitarization of the scattering amplitudes leads to the emergence of a tetraquark bound state, located very close to the lowest two-meson elastic threshold.
© The Authors, published by EDP Sciences, 2024
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