Moments of the electron energy spectrum and partial branching fraction of B→Xceν decays at the Belle detector

Le résumé fourni par la source

We report a measurement of the inclusive electron energy spectrum for charmed semileptonic decays of $B$ mesons in a $140\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric energy ${e}^{+}{e}^{\ensuremath{-}}$ 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 ${B}^{0}$ partial branching fractions at 0.4 GeV and 0.6 GeV electron threshold energies. We measure the independent ${B}^{+}$ and ${B}^{0}$ partial branching fractions with electron threshold energies of 0.4 GeV to be $\ensuremath{\Delta}\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{X}_{c}e\ensuremath{\nu})=(10.79\ifmmode\pm\else\textpm\fi{}0.25(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.27(\mathrm{sys}.))%$ and $\ensuremath{\Delta}\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{X}_{c}e\ensuremath{\nu})=(10.08\ifmmode\pm\else\textpm\fi{}0.30(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.22(\mathrm{sys}.))%$. Full correlations between all measurements are evaluated.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.