Scattering length expansion of the coupled channels$\bar pp \to \bar \Lambda \Lambda$ and$\bar \Lambda \Lambda \to \bar \Lambda \Lambda$ near theΛ production threshold

Abstract

We fit the scattering lengths in the triplets-,p- andd- waves for the two channels$\bar pp \to \bar \Lambda \Lambda$ and$\bar \Lambda \Lambda \to \bar \Lambda \Lambda$ near theΛ production threshold to the differential cross section$\frac{{d\sigma }}{{d\Omega }}(\bar pp \to \bar \Lambda \Lambda )$ and to the polarization P.