2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/38860The next to leading order (NLO) contribution of the generalized finite size mass shift formula for an interacting two stable particle system in a periodic $L^{3}$ box is discriminated with maintaining its model independent structure and validity to all orders in perturbation theory. The influence of the NLO contribution is examined for the nucleon mass shift in the realistic nucleon-pion system.12 pages, 5 eps figuresHigh Energy Physics - Latticetext