Soft-photon analysis of pion-proton bremsstrahlung and the ‘‘experimental’’ magnetic moment ofΔ++(1232)

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Abstract
We present a special two-energy-two-angle amplitude which can be rigorously derived for the pion-proton bremsstrahlung (π+pγ) process near the Δ++(1232) resonance and report the magnetic dipole moment of the Δ++,μΔ, extracted from existing data. The extracted value of μΔ are 3.7–4.2 e/2mp from one set of data and 4.6–4.9 e/2mp from another. Here, mp is the proton mass. The overall agreement between the theortical predictions calculated with the extracted μΔ and the experimental measurements is excellent.