Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 30: Elektromagnetische und Hadronische Proben

HK 30.9: Talk

Tuesday, March 8, 2005, 18:45–19:00, TU MA001

Improved radiative corrections for (e,e′p) experiments — •Florian Weißbach, Kai Hencken, Daniela Rohe, Ingo Sick, and Dirk Trautmann — Departement für Physik und Astronomie, Universität Basel, CH – 4056 Basel, Switzerland

(e,e′p) experiments are well-suited to study nuclear structure. However, these experiments are subject to radiative corrections which have to be carefully considered in oder to reach the desired accuracy. Up to now radiative corrections for (e,e′p) experiments have always been approached using the so called ’peaking approximation’ which assumes that all the bremsstrahlung is aligned with the particle momenta. We show that this assumption is not applicable to radiation coming from the scattered proton, and that this approach generally underestimates unpeaked bremsstrahlung contributions. We remove the peaking approximation with the effect that we can describe the reconstructed bremsstrahlung photon angular distribution much better than the peaking approximation. This check is done against data from the Thomas Jefferson National Accelerator Facility (TJNAF). Also we gain some insight in the limits of the ’soft photon approximation’ which underlies most calculations of radiative corrections.