No abstract

The three complex form factors entering the ⌬˜N␥* vertex are calculated to O( 3 ) in the framework of a chiral effective theory with explicit ⌬(1232) degrees of freedom included. It is shown that the low q 2 behavior of the form factors is governed by N, ⌬ loop effects. Predictions are given for the q 2 dependence of the three transition multipoles M 1(q 2 ), E2(q 2 ), C2(q 2 ). Furthermore, the role of the presently unknown low energy constants that affect the values of the multipole ratios EMR(q 2 ) and CMR(q 2 ) is elucidated.

No abstract