Study of B→Xγ decays and determination of |Vtd/Vts|

Le résumé fourni par la source

Using a sample of $471\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected with the BABAR detector, we study the sum of seven exclusive final states $B\ensuremath{\rightarrow}{X}_{s(d)}\ensuremath{\gamma}$, where ${X}_{s(d)}$ is a strange (nonstrange) hadronic system with a mass of up to $2.0\text{ }\text{ }\mathrm{GeV}/{c}^{2}$. After correcting for unobserved decay modes, we obtain a branching fraction for $b\ensuremath{\rightarrow}d\ensuremath{\gamma}$ of $(9.2\ifmmode\pm\else\textpm\fi{}2.0(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}2.3(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ in this mass range, and a branching fraction for $b\ensuremath{\rightarrow}s\ensuremath{\gamma}$ of $(23.0\ifmmode\pm\else\textpm\fi{}0.8(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}3.0(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ in the same mass range. We find $\frac{\mathcal{B}(b\ensuremath{\rightarrow}d\ensuremath{\gamma})}{\mathcal{B}(b\ensuremath{\rightarrow}s\ensuremath{\gamma})}=0.040\ifmmode\pm\else\textpm\fi{}0.009(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.010(\mathrm{syst})$, from which we determine $|{V}_{td}/{V}_{ts}|=0.199\ifmmode\pm\else\textpm\fi{}0.022(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.024(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.002(\mathrm{th})$.

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