The E2/M1 ratio of electromagnetic N(939){→}{Δ}(1232) transitions is calculated in a relativistic three-quark model for the nucleon and {Δ}(1232). Relativistic kinematics in the three-quark N and {Δ} wave functions yields an E2/M1 contribution of about -0.2% without any tensor forces in the dynamics.
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Biénkowska et al. (1987) studied this question.
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