Speaker
Description
The most recent $\gamma p \to p \pi^{0}$ [1,2,3] and $\gamma p \to n \pi^{+}$ data have been used
for multipole amplitude extraction at the $\Delta^{+}(1232)$ resonance.
The data have been analysed in a novel way, utilizing the Athens Model Independent Analysis Scheme (AMIAS),
yielding precise results with little, if any, model error. The benchmark quantity in nucleon deformation,
$EMR = E1+^{3/2}/M1+^{3/2}$, was determined to be: $-(2.5^{+0.3}_{-0.2}stat)\%$ and
$-(2.5^{+0.4}_{-0.3}stat+syst)\%$,
consistent with previous results but for the first time free of model error.
Non resonant amplitudes up to L = 5 have also been extracted which test the
sophisticated phenomenological model used in nucleon resonance research.
The elaborate analysis scheme and its comparison to the traditional methods will be presented at the conference.
