Diquarks and \Lambda_{b}\to\Lambda_c weak decays

Abstract

In this work we investigate the weak ${\Lambda }_b\to {\Lambda }_c$ semi-leptonic and non-leptonic decays. The light-front quark model and diquark picture for heavy baryons are adopted to evaluate the ${\Lambda }_b\to {\Lambda }_c$ transition form factors. In the heavy quark limit we study the Isgur-Wise function. By fitting the data of the semi-leptonic process we obtain the mass of the light scalar diquark as 817 MeV. The numerical predictions on the branching ratios of non-leptonic decay modes ${\Lambda }_b\to {\Lambda }_{c}M$ and various polarization asymmetries are made. A comparison with other approaches is discussed.

Comments: 23 pages, 3 figures