Two body non-leptonic ${\Lambda }_b$ decays in the large $N_c$ limit

Abstract

The two body non-leptonic ${\Lambda }_b$ decays are analyzed in the HQET with factorization approximation and large $N_c$ limit. In this limit, ${\Lambda }_b$ and ${\Lambda }_c$ baryons can be treated as the bound states of chiral soliton and heavy meson, and consequently the Isgur-Wise function comes out in a straight forward manner. The results obtained remain well below their previously predicted upper limit.