Determination of |Vcb| using N3LO perturbative corrections to Γ(B → Xclν) and 1S masses

We determine vertical bar V-cb vertical bar using the third-order perturbative series for the inclusive semileptonic B decay width and for the masses of the bottomonium 1S states. We use the masses of eta(b)(1S) and Upsilon(1S) as short-distance masses and point out that there is a sizable difference of vertical bar V-cb vertical bar between the two 1S mass schemes. This is the dominant error of our determination and stems from insufficiency to describe theoretically the observed mass splitting of the bottomonium 1S states. We also study the significance of the O(Lambda(2)((MS) over bar)) non-perturbative effects in HQET with respect to the current perturbative accuracy. Our result vertical bar V-cb vertical bar = 0.0425(11) is consistent with the PDG value determined from the inclusive decays and has a slightly larger error. (C) 2022 The Author(s). Published by Elsevier B.V.