2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/203023We adopt the Y-formalism to study beta-gamma systems on hypersurfaces. We compute the operator product expansions of gauge-invariant currents and we discuss some applications of the Y-formalism to model on Calabi-Yau spaces.32 pp, no figuresHigh Energy Physics - Theorytext