Pion and kaon vector form factors

Pion and kaon vector form factors

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Pion and kaon vector form factors

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Oller Berber, José Antonio; Oset Báguena, Eulogio; Palomar Burdeus, Juan Esteban
This document is a artículoDate2001

We develop a unitarity approach to consider the final state interaction corrections to the tree level graphs calculated from Chiral Perturbation Theory (χPT) 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 χPT results. A very good description of experimental data is accomplished for the vector form factors and for the ππ P-wave phase shifts up to s√≲1.2 GeV, beyond which multiparticle states play a non negligible role. In particular the low and resonance energy regions are discussed in detail and for the former a comparison with one and two loop χPT is made showing a remarkable coincidence with the two loop χPT results.
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