Using several amplitude parametrizations like explicitly unitary amplitudes in the scattering length approximation and the separable potentials we describe the coupled channel $\pi\eta$, $K\overline{K}$ scattering in the vicinity of the $a_0(980)$ resonance.
Then we train the neural network to localize the poles corresponding to the $a_0(980)$ resonance across several decay reactions. We...
The quantum many-body problem lies at the heart of a wide spectrum of physical phenomena, ranging from interacting quarks to molecular dynamics, yet it poses a great computational challenge that remains unsolved. Traditional approaches often face a trade-off between accuracy and tractability, due to an underlying issue commonly known as the “curse of dimensionality”. In this context, the...
In strongly coupled field theories, perturbation theory cannot be employed to study the low-energy spectrum. Thus, non-perturbative techniques are required. One possibility is the Lagrangian approach, where energies are extracted from the Euclidean-time dependence of correlation functions. This method suffers from excited-state contamination at shorter times and rapidly growing statistical...
