Speaker
Description
The large $N_\text{c}$ limit of QCD is a simplification of the theory that preserves most of its non-perturbative features and has been used by many phenomenological approaches to QCD. However, subleading $N_\text{c}$ effects are hard to estimate and can lead to incorrect predictions. In this talk, I will discuss how we are using lattice simulations to study these subleading Nc effects in the context of mesons-meson scattering in a theory with $N_\text{f}=4$ degenerate quark flavors. I will first discuss some results on pion-pion scattering near threshold, which we use to constrain the $N_\text{c}$ scaling of low energy constants from chiral perturbation theory. Later, I will present some ongoing work that extends the previous study to higher energies. We focus on some channels expected to contain tetraquark resonances, aiming at constraining the $N_\text{c}$ dependence of these states, around which there has been much controversy.
