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

TL;DR

This paper investigates the weak decays of Lambda_b baryons into Lambda_c using a light-front quark model and diquark picture, providing predictions for decay rates and polarization asymmetries.

Contribution

It introduces a novel application of the light-front quark model with diquark assumptions to compute transition form factors and decay observables for Lambda_b to Lambda_c decays.

Findings

Light scalar diquark mass fitted at 817 MeV

Predicted branching ratios for non-leptonic decays

Calculated polarization asymmetries

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.