Nonperturbative methods in particle physics
Nonperturbative methods in particle physics are introduced. Three nonperturbative approaches are used to extend chiral perturbation theory. Dispersive technique is used to address the asymptotic limit and structure of the pion form factor performing the matching with the constraints of perurbative QCD and chiral perurbation theory. Models of Bosonization technique are used to generate an effective action directly from QCD in order to predict the size of the low energy constants strictly from theory. A simple constituent quark model is also suggested to study the model dependence of [special characters omitted] non-leptonic hyperon decay amplitudes arising from isospin mixing. Finally, spin-dependent physics of monopoles are introduced to examine Montonen-Olive's electromagnetic duality conjecture by studying the long-range field of the different states in the N = 2 BPS monopole supermultiplet.