Speaker
Manca Mrvar
(Austrian Academy of Sciences (AT))
Description
A new theoretical framework based on the Operator Product Expansion allows to extract the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb with O(1/mb^4) precision. This approach requires also the measurement of the moments of the q^2 distribution, the sum of the charged lepton and neutrino 4-momenta squared, which are unmeasured up to now. The |Vcb| parameter will be determined from the branching fraction of the reconstructed B-meson decay into a hadronic system with charm, a light lepton and the associated neutrino, combined with measurements of q^2 moments of the lepton-neutrino system. In this talk preliminary results, based on the data sample collected by the Belle II experiment, will be presented.
Author
Manca Mrvar
(Austrian Academy of Sciences (AT))
