August 30, 2021 to September 3, 2021
University of Innsbruck
Europe/Zurich timezone

【326】Measurement of q^2 moments in inclusive B -> Xclnu decays and determination of the Cabibbo-Kobayashi- Maskawa matrix element Vcb at Belle II

Sep 1, 2021, 3:45 PM
Room B

Room B

Talk Nuclear, Particle- and Astrophysics (FAKT - TASK) Nuclear, Particle- & Astrophysics


Manca Mrvar (Austrian Academy of Sciences (AT))


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.

Primary author

Manca Mrvar (Austrian Academy of Sciences (AT))

Presentation materials