The q 2 moments in inclusive semileptonic B decays

Abstract

Abstract We compute the first moments of the q 2 distribution in inclusive semileptonic B decays as functions of the lower cut on q 2, confirming a number of results given in the literature and adding the O α s 2 β 0 $$ O\left({\alpha}_s^2{\beta}_0\right) $$ BLM contributions. We then include the q 2-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 |V cb |. Our updated value is |V cb | = (41.97 ± 0.48) × 10 −3.

Keywords

• Bottom Quarks
• CKM Parameters
• Semi-Leptonic Decays