2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/199687We examine the shift in the chiral condensate due to a constant electromagnetic field at ${\cal O}(p^6)$ using SU(2) chiral perturbation theory and a realistic $M_π= 140 \textrm{MeV}$. We find that this value differs significantly from the value calculated using $M_π= 0$, while the magnitude of the two-loop correction is unclear due to the uncertainty in the experimentally determined value of the relevant ${\cal L}_6$ LEC.7 pages, 4 figuresHigh Energy Physics - Phenomenologytext