Measurement of the B-Meson Inclusive Semileptonic Branching Fraction and Electron-Energy Moments

TL;DR

This paper presents a precise measurement of the B-meson semileptonic branching fraction and electron-energy moments using data from the CLEO II detector, improving understanding of B-meson decay properties.

Contribution

It provides a new measurement of the B-meson semileptonic branching fraction and electron-energy moments with high precision, utilizing charge and angular correlations to distinguish decay sources.

Findings

Semileptonic branching fraction: (10.91 +- 0.09 +- 0.24)%

Electron energy spectrum moments measured for energies 0.6-1.5 GeV

Enhanced understanding of B-meson decay dynamics

Abstract

We report a new measurement of the B-meson semileptonic decay momentum spectrum that has been made with a sample of 9.4/fb of electron-positron annihilation data collected with the CLEO II detector at the Y(4S) resonance. Electrons from primary semileptonic decays and secondary charm decays were separated by using charge and angular correlations in Y(4S) events with a high-momentum lepton and an additional electron. We determined the semileptonic branching fraction to be (10.91 +- 0.09 +- 0.24)% from the normalization of the electron-energy spectrum. We also measured the moments of the electron energy spectrum with minimum energies from 0.6 GeV to 1.5 GeV.