Measurement of the ${\mathcal{B}} (\Lambda^0_{b} \rightarrow J/\Psi \Lambda_0)$ using 6.1 fb$^{-1}$ of D0 data

We report a new measurement of the branching ratio ${\mathcal{B}} (\Lambda^0_{b}\to J/\psi \Lambda_0)$ using 6.1 fb$^{-1}$ of $p \overline{p}$ collisions at $\sqrt{s}=1.96$ TeV recorded by the D0 detector at Fermilab, between 2002 and 2009. The uncertainty in the new measurement of ${\mathcal{B}} (\Lambda^0_{b}\to J/\psi \Lambda_0)$ was reduced to half of the uncertainty in the world average from the PDG. We also report a new measurement of the the production cross-section times the branching fraction for the decay $\Lambda^0_{b} \rightarrow J/\Psi \Lambda_0$ relative to that for the decay $B^0_d \rightarrow J/\Psi K^{0}_{s}$.