München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 34: Elektromagnetische und Hadronische Sonden

HK 34.1: Gruppenbericht

Mittwoch, 22. März 2006, 16:30–17:00, F

Radiative corrections to (e,e′p) experiments — Going beyond peaking and soft photon approximation — •Florian Weißbach, Kai Hencken, Daniela Rohe, Ingo Sick, and Dirk Trautmann — Universität Basel, Departement für Physik und Astronomie, CH - 4056 Basel, Switzerland

Exclusive electron scattering experiments are subject to QED radiative corrections [J. Schwinger, Phys. Rev. 75, 898 (1949)], like e.g. bremsstrahlung. These corrections can be calculated exactly in pure QED and to a good accuracy including hadronic loops. But most (e,e′p) data analysis procedures consider these radiative corrections only approximatively, using both the peaking approximation and the soft photon approximation [R. Ent et al., Phys. Rev. C 64, 054610 (2001)]. Both approximations have their limitations [F. Weissbach et al., nucl-th/0411033]. We show that the peaking approximation can be removed from data analysis completely. And we introduce a method to remove the soft photon approximation partially for multi-photon bremsstrahlung. Removal of the peaking approximation improves the discreption of the angular photon distribution considerably. And removal of the soft photon approximation could have an impact on Rosenbluth data analyses [P. Guichon, M. Vanderhaeghen, Phys. Rev. Lett. 91, 142303 (2003)].