Scattering length expansion of the coupled channels <img src="/fulltext-image.asp?format=htmlnonpaginated&src=R1K1617430640141_html\10050_2005_Article_BF01303026_TeX2GIFIE1.gif" border="0" alt=" $$\bar pp \to \bar \Lambda \Lambda$$ " /> and <img src="/fulltext-image.asp?format=htmlnonpaginated&src=R1K1617430640141_html\10050_2005_Article_BF01303026_TeX2GIFIE2.gif" border="0" alt=" $$\bar \Lambda \Lambda \to \bar \Lambda \Lambda$$ " /> near theΛ production threshold

We fit the scattering lengths in the triplets-,p- andd- waves for the two channels <img src="/fulltext-image.asp?format=htmlnonpaginated&src=R1K1617430640141_html\10050_2005_Article_BF01303026_TeX2GIFIE3.gif" border="0" alt=" $$\bar pp \to \bar \Lambda \Lambda$$ " /> and <img src="/fulltext-image.asp?format=htmlnonpaginated&src=R1K1617430640141_html\10050_2005_Article_BF01303026_TeX2GIFIE4.gif" border="0" alt=" $$\bar \Lambda \Lambda \to \bar \Lambda \Lambda$$ " /> near theΛ production threshold to the differential cross section <img src="/fulltext-image.asp?format=htmlnonpaginated&src=R1K1617430640141_html\10050_2005_Article_BF01303026_TeX2GIFIE5.gif" border="0" alt=" $$\frac{{d\sigma }}{{d\Omega }}(\bar pp \to \bar \Lambda \Lambda )$$ " /> and to the polarization P.