Tagged linearly polarized photons have been used at the Mainz Microtron MAMI for simultaneous measurements of the p( γ, p)π 0 and p( γ, π + )n reaction channels to study the γN → ∆(1232) transition. The energy dependence of the magnetic dipole M 3/2 1+ and electric quadrupole E 3/2 1+ amplitudes have been extracted from these data in the photon energy range from 270 to 420MeV.The E2/M 1 ratio for the γN → ∆(1232) transition has been determined to be −(2.5 ± 0.1 stat ± 0.2 sys )% at the resonance position (δ 33 = 90 0 ).
Constraining the (γ, π) amplitude for E2 N → ∆ In a recent Letter [1] we have reported precision measurements of differential cross sections and polarized photon asymmetries for the reaction γp → pπ 0 with the DAPHNEdetector, using tagged photons at the Mainz Microtron MAMI. The above Comment [2] critizies our value R EM = ImE 3/2 1 + /ImM 3/2 1 + = −(2.5 ± 0.2 ± 0.2)%, because of possible ambiguities stemming from contributions of higher partial waves.
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