We report a measurement of the inclusive electron energy spectrum for charmed semileptonic decays of B mesons in a 140fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. We determine the first four moments of the electron energy spectrum for threshold values of the electron energy between 0.4 and 2.0 GeV. In addition, we provide values of the partial branching fraction (zeroth moment) for the same electron threshold energies, and independent measurements of the B+ and B0 partial branching fractions at 0.4 GeV and 0.6 GeV electron threshold energies. We measure the independent B+ and B0 partial branching fractions with electron threshold energies of 0.4 GeV to be ΔB(B+→Xceν)=(10. 79±0.25(stat.)±0.27(sys.))% and ΔB(B0→Xceν)=(10. 08±0.30(stat.)±0.22(sys.))%. Full correlations between all measurements are evaluated.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 2007 Feb 2|
Bibliographical noteFunding Information:
This work was supported by grants from Progetti Finalizzati: “Ingegneria Genetical’ and “Applicazioni Cliniche della Ricerca Oncologica,” CNR (Rome) and by funds from the Associazione Italiana per la Ricerca sul Cancro (Milan). We thank Drs. Rodolfo Quarto and Francesco Minuto for suggestions and helpful discussions, and Silvio Garofalo, who specifically contributed to Section IX. We also thank Ms. Barbara Minuto and Ms. Daniela Giacoppo for editorial and secretarial help.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)