γγtoπ^+π^- in the Modified Perturbative Approach

We investigate the transverse momentum effects in $\gamma\gamma\to\pi^+\pi^-$ at moderately large total center of mass energy $\sqrt{s}$ in the modified perturbative approach. The calculation of the differential cross section using different approximations shows that the inclusion of $k_\perp$ in the quark and gluon propagators cannot lead to a considerable improvement of the theoretical prediction.