The <f>ΔNγ</f> electromagnetic transition form factors <f>GM*(q2)</f> and <f>GE*(q2)</f>

A parameter-free, nonperturbative calculation of the <f>ΔNγ</f> electromagnetic transition amplitudes <f>GM*(q2)</f>, <f>GE*(q2)</f>, and the resonant multipole ratio <f>REM(q2)≡E1+3/2(q2)/M1+3/2(q2)</f> is performed in terms of the well-known nucleon isovector Sachs form factor <f>GMV</f>. Our methods are fully relativistic with conservation of the electromagnetic current guaranteed. We find that <f>GM*(q2)</f> decreases more rapidly than the nucleon dipole form factor when <f>-q2≳1</f> GeV2<f>/c2</f> and that <f>REM(q2)</f> remains small even for very high four-momentum transfer implying that the perturbative QCD prediction <f>REM(q2)→1</f> is purely asymptotic and is valid only for extremely high <f>&z.sfnc;q2&z.sfnc;</f>. [Copyright &y& Elsevier]