Measurements of Moments of the Hadronic Mass Distribution in Semileptonic B Decays

TL;DR

This paper presents measurements of the first four moments of the hadronic mass distribution in semileptonic B decays, using a large dataset to improve the precision of fundamental CKM matrix element determinations.

Contribution

It provides the first four moments of the hadronic mass distribution in B --> X_c lv decays across various lepton momentum thresholds, enhancing the understanding of B decay dynamics.

Findings

Measured moments for lepton momenta from 0.9 to 1.6 GeV

Results will improve |V_{cb}| and |V_{ub}| determinations

Utilized 89 million B meson events

Abstract

We report a measurement of the first four moments of the hadronic mass distribution in B --> X_c lv decays. The measurements are based on 89 million Upsilon(4S) --> BBbar events where the hadronic decay of one of the B mesons is fully reconstructed and a charged lepton from the decay of the other B meson is identified. The moments are presented for minimum lepton momenta ranging from 0.9 to 1.6 GeV in the B rest frame. It is expected that such measurements will lead to improved determinations of |V_{cb}| and |V_{ub}|.