The chiral condensate in a constant electromagnetic field at O(p^6)
Abstract
Description
We 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 figures
7 pages, 4 figures