Chiral unitary approach to the K−–deuteron scattering length Original Research Article

Starting from a recent model where the View the MathML source amplitudes are evaluated from the chiral Lagrangians using a coupled-channel unitary method, we evaluate here the scattering length for K−–deuteron scattering. We find that the double scattering contribution is very large compared to the impulse approximation and that the charge-exchange contribution of this rescattering is as large as the sequential K− scattering on the two nucleons. Higher-order rescattering corrections are evaluated using coupled channels with K− and View the MathML source within the integral form of the fixed centre approximation to the Faddeev equations. The higher-order corrections involving intermediate pions and hyperons are found negligible.