On chiral corrections to nucleon GPD
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Within the heavy baryon chiral perturbation theory we derive the leading chiral correction to the nucleon GPD at γ=0 . We discuss the difficulties of consideration non-local light-cone operators within heavy baryon approach and the methods to solve the difficulties. The consideration of the chiral corrections directly for non-local operators allows to resolve the ambiguity of the inverse Mellin transformation. In particular, we show that the mixing between axial and vector GPDs are of order m π 2 /M N 2 , which is two orders of magnitude less that it follows from the calculation of Mellin moments.