Novel analysis of chiral loop effects in the generalized Gerasimov-Drell-Hearn sum rule
Véronique Bernard, Thomas R. Hemmert, Ulf-G. Meißner
Abstract
We study the chiral loop corrections to the generalized Gerasimov-Drell-Hearn sum rule of the nucleon for finite photon virtuality in the framework of a Lorentz-invariant formulation of baryon chiral perturbation theory. We perform a complete one-loop calculation and obtain significant differences to previously found results based on the heavy baryon approach for the proton and neutron spin-dependent forward Compton amplitudes.
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