Three-loop QCD corrections to heavy-to-light form factors and applications to inclusive $B$ decays

Abstract: We report on the calculation of heavy-to-light form factors at $\mathcal{O}(α<em>s<sup>3)$ and on selected phenomenological applications in inclusive $B$-decays. After outlining the loop calculation, we extract the hard function in $\bar B \to X_s γ$, and discuss our recent progress and preliminary results for the N$<sup>3$LO corrections to partial decay rates in $\bar B \to X_u l \bar ν_l$, important for the inclusive determination of $|V</em>{ub}|$. In particular, we establish relations for heavy-quark parameters in the shape-function scheme to four loops and improve a particular model of the $B$ meson shape-function.