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We examine the shift in the chiral condensate due to a constantelectromagnetic field at ${\cal O}(p^6)$ using SU(2) chiral perturbation theoryand a realistic $M_\pi = 140 \textrm{MeV}$. We find that this value differssignificantly from the value calculated using $M_\pi = 0$, while the magnitudeof the two-loop correction is unclear due to the uncertainty in theexperimentally determined value of the relevant ${\cal L}_6$ LEC.

The chiral condensate in a constant electromagnetic field at O(p^6)