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Description:
We develop a unitarity approach to consider the final state interaction corrections to the tree level graphs calculated from chiral perturbation theory (chi PT) allowing the inclusion of explicit resonance fields. The method is discussed considering the coupled channel pion and kaon Vector form factors. These form factors are then matched with the one loop chi PT results. A very good description of experimental data is accomplished for the vector form factors up to roots less than or equal to1.2 GeV beyond which multiparticle slates play a non-negligible role. For the P-prave pi pi phase shifts the agreement with data stands even higher up to roots less than or equal to1.5 GeV. We also consider the isospin breaking effects due to the omega-rho mixing as a perturbation to the previous results. In addition the low and resonance energy regions are discussed in detail and for the former a comparison with one and two loop chi PT is made showing a remarkable coincidence with the two loop chi PT results.