Isospin breaking in pion and Kl4 form factors

Marc Knecht (Marseille)

Abstract:

A dispersive construction of two-loop pion form factors in the presence of isospin breaking due to the difference between the masses of charged and neutral pions is described. The effects of isospin breaking on the phases of the form factors as a function of the scattering lengths is discussed. Applications of this approach to the Kl4 form  factors will also be addressed

Kategorie: Kernphysik