The E2/M1 ratio in Δ photoproduction

New high-precision measurements of p(γ,π) and p(γ,γ) cross sections and beam asymmetries have been combined with other polarisation ratios in a simultaneous analysis of both reactions. The E2/M1 mixing ratio for the N→Δ transition extracted from this analysis is EMR=−3.0%±0.3(stat+sys)±0.2 (model).