Abstract
Electromagnetic properties of the octet mesons as well as the octet and decuplet baryons are augmented in quenched and partially quenched chiral perturbation theory to include $O(a)$ corrections due to lattice discretization. We present the results for the $\mathrm{SU}(3)$ flavor group in the isospin limit as well as the results for $\mathrm{SU}(2)$ flavor with nondegenerate quarks. These corrections will be useful for extrapolation of lattice calculations using Wilson valence and sea quarks, as well as calculations using Wilson sea quarks and Ginsparg-Wilson valence quarks.
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