1208.1714 (Alena M. Moiseeva et al.)

On chiral corrections to nucleon GPD    [PDF]

Alena M. Moiseeva, Alexey A. Vladimirov

Within the heavy baryon chiral perturbation theory we derive the leading chiral correction to the nucleon GPD at \xi=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^2/M^2, which is two orders of magnitude less that it follows from the calculation of Mellin moments.

View original: http://arxiv.org/abs/1208.1714