2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/38716The critical quark mass, at which the renormalised mass vanishes, is computed in the Schrodinger functional scheme with a non vanishing background field at one-loop order of perturbation theory. Further one-loop calculations are done for the renormalisation constant of the pseudo scalar density and for several discretisation errors and compared to results obtained with a vanishing background field.PhD thesis, 149 pagesHigh Energy Physics - Latticetext