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Generalized polarizabilities and the spin-averaged amplitude in virtual Compton scattering

a r X i v :n u c l -t h /9608061v 1 28 A u g 1996MKPH-T-96-20Generalized polarizabilities and the spin-averaged amplitude in virtual Compton scattering offthe nucleon D.Drechsel,G.Kn¨o chlein,A.Metz,S.Scherer Institut f¨u r Kernphysik,Johannes Gutenberg-Universit¨a t,J.J.Becher-Weg 45,D-55099Mainz,Germany (August 28,1996)Abstract We discuss the low-energy behavior of the spin-averaged amplitude of virtual Compton scattering (VCS)offa nucleon.Based on gauge invariance,Lorentz invariance and the discrete symmetries,it is shown that to first order in the frequency of the final real photon only two generalized polarizabilities appear.Different low-energy expansion schemes are discussed and put into perspective.13.40Gp,13.60.Fz,14.40.Dh

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