The q2 moments in inclusive semileptonic B decays

Abstract

Abstract We compute the first moments of the q2 distribution in inclusive semileptonic B decays as functions of the lower cut on q2, confirming a number of results given in the literature and adding the $$ O\left({\alpha}_s^2{\beta}_0\right) $$ O α s 2 β 0 BLM contributions. We then include the q2-moments recently measured by Belle and Belle II in a global fit to the moments. The new data are compatible with the other measurements and slightly decrease the uncertainty on the nonperturbative parameters and on |Vcb|. Our updated value is |Vcb| = (41.97 ± 0.48) × 10−3.