Tübingen 2003 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 3: Elektromagnetische und hadronische Proben I

HK 3.3: Talk

Monday, March 17, 2003, 16:45–17:00, B

Chiral loop effects in the generalized Gerasimov–Drell–Hearn Sum Rule — •Thomas R. Hemmert¹, Véronique Bernard², and Ulf-G. Meißner³ — ¹Theoretische Physik T39, Physik Department, TU München, Germany — ²U. L. Pasteur, LPT, Strasbourg, France — ³FZ Jülich, IKP(Th), Jülich, Germany

We study [1] 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. We also present recent results [2] on the Burkhardt-Cottingham sum rule, as well as the forward and longitudinal-transverse spin polarizabilities at zero and finite photon virtuality.

• [1] V. Bernard, T.R. Hemmert and U.-G. Meißner, Phys. Lett. B545,
  105 (2002).
• [2] V. Bernard, T.R. Hemmert and U.-G. Meißner, forthcoming.