Electromagnetic corrections for pions and kaons: masses and polarizabilities Original Research Article

The unknown constants in Chiral Perturbation Theory needed for an all orders analysis of the polarizabilities and electromagnetic corrections to the masses of the pseudo-Goldstone bosons are estimated at leading order in 1Nc. We organize the calculation in an 1Nc expansion and separate long- and short-distance physics contributions by introducing a Euclidean cut-off. The long-distance part is evaluated using the ENJL model and the short-distance part using perturbative QCD and factorization. We obtain very good matching between both.