Exclusive measurements of b→sγ transition rate and photon energy spectrum

Le résumé fourni par la source

We use $429\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collision data collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the BABAR detector to measure the radiative transition rate of $b\ensuremath{\rightarrow}s\ensuremath{\gamma}$ with a sum of 38 exclusive final states. The inclusive branching fraction with a minimum photon energy of 1.9 GeV is found to be $\mathcal{B}(\overline{B}\ensuremath{\rightarrow}{X}_{s}\ensuremath{\gamma})=(3.29\ifmmode\pm\else\textpm\fi{}0.19\ifmmode\pm\else\textpm\fi{}0.48)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ where the first uncertainty is statistical and the second is systematic. We also measure the first and second moments of the photon energy spectrum and extract the best-fit values for the heavy-quark parameters, ${m}_{b}$ and ${\ensuremath{\mu}}_{\ensuremath{\pi}}^{2}$, in the kinetic and shape function models.

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