second one linear in the cranking parameter $\Omega$. As we will see later on, those terms will contribute to the electric isovector and magnetic isoscalar parts of the form factors.

As the above considerations were limited to the regularized part of the action a comment concerning the non-regularized parts is in order. In general, there are two types of non-regularized contributions: the valence parts (for all form factors) and the sea parts of both isoscalar form factors. To compute these quantities we can start directly from the non-regularized action () as it was done in \[\]. The electromagnetic current reads:

$$j_{\mu}(x) \equiv {S_{eff}[A_{\mu}]\over\delta A^{\mu}}
\Bigg\vert_{A_{\mu}=0}
= N_c \, {\rm Tr}_{\gamma} {\rm Tr}_{\tau}
 \sum_n \int {d\omega\over 2 \pi} \, \psi_n^{\dagger}(x) \,
{1\over \omega + ih - \Omega} \, R^{\dagger} Q R \,\, \gamma_4
\gamma_{\mu} \, \psi_n(x)
\ , \eqno(\CURRNR)$$

where the integral over $\omega$ stands for the trace in Euclidean time according to (). Further calculations can be easier done, without using the expansion (), just expanding () in terms of (small) $\Omega$. The same results can be obtained by imposing the $\Lambda^2\to\infty$ limit on our regularized expressions (using formulae () of Appendix).

The second remark concerns our practical calculation of 