Researchers have updated predictions for the total decay rates and lifetimes of b-baryons, as well as their lifetime ratios relative to the B^0_d meson. This work, conducted within the framework of the heavy quark expansion (HQE), incorporates for the first time next-to-next-to-leading-order (NNLO) quantum chromodynamics (QCD) corrections for the free b-quark decay. The inclusion of these NNLO corrections significantly reduces theoretical uncertainties in the total decay rates, enhancing model precision.

In addition to the NNLO corrections for the free b-quark, the study also includes, for the first time, complete next-to-leading-order (NLO) QCD corrections to dimension-five contributions. While these latter corrections have a minor effect on the total decay rates, they induce a noticeable shift in the lifetime ratios. This improvement is crucial as it brings HQE predictions closer to current experimental data, resolving some previous discrepancies.

Overall, the agreement between HQE predictions and current experimental measurements is excellent for both total decay rates and lifetime ratios, within the stated uncertainties. This advancement is particularly relevant given recent and forthcoming experimental progress in the study of b-baryons, which will allow for more rigorous comparisons between theory and experiment and help refine our understanding of the strong interaction and heavy quark physics.