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HK: Hadronen und Kerne

HK 57: Plenar

HK 57.3: Gruppenbericht

Donnerstag, 19. März 1998, 10:30–11:00, P

Virtual Compton Scattering off the Proton and Generalized Polarizabilities — •S. Scherer, D. Drechsel, G. Kn"ochlein, and A. Metz — Institut f"ur Kernphysik, Johannes Gutenberg-Universit"at, J.J. Becher Weg 45, D-55099 Mainz

We discuss virtual Compton scattering off the proton as tested in the reaction ep→ epγ. At first order in the frequency of the final photon, the invariant amplitude beyond the low-energy theorem can be expressed in terms of ten generalized polarizabilities [1]. We show that four independent relations exist among the polarizabilities, once charge conjugation symmetry is implemented in combination with nucleon crossing [2]. We present predictions for the generalized polarizabilities which have been obtained in the framework of heavy baryon chiral perturbation theory at O(p³) [3] and the linear σ model at one-loop level [4].

[1] P. A. M. Guichon, G. Q. Liu, and A. W. Thomas, Nucl. Phys. A591, 606 (1995)

[2] D. Drechsel, G. Kn"ochlein, A. Yu. Korchin, A. Metz, and S. Scherer, nucl-th/9704064

[3] T. R. Hemmert, B. R. Holstein, G. Kn"ochlein, and S. Scherer, Phys. Rev. Lett. 79, 22 (1997)

[4] A. Metz and D. Drechsel, MKPH-T-97-13 (1997)