corrections, which really have been shown to be important for the isovector magnetic moment. Calculations of this sort give us possibility to calculate all electromagnetic properties of nucleons, as well as such quantities like the electric mean squared radii, the magnetic moments, the nucleon–$\Delta$ energy splitting, and the electric and magnetic charge distributions.

The paper is organized as follows: we begin in Sec. 2 with formulation of the regularized model, introduction of the rotational zero modes and we derive expression for the electromagnetic current treating the angular velocity as a perturbation. In Section 3 we derive the analytical expressions for the form factors including terms up to the linear order in angular velocity. Section 4 is devoted to presentation of numerical results. Summary and discussion is given in the last section.

**2. The regularized action and current**

In Minkowski space the generating functional of the model written in terms of the quark and meson fields, $\sigma({\vec x}), {\vec\pi}({\vec x})$ has the form:

$$Z_{NJL}' = \int {\cal D}\bar q {\cal D}q
{\cal D}\sigma {\cal D}{\vec \pi}
\exp\left[\, i \int d^4x {\cal L}_{NJL}' (x) \right] \ ,
\eqno(\NEWGENp)$$ The sources are not explicitly included.

Since the NJL model is a non-renormalizable theory, 