Precision measurement of the D*0 decay branching fractions

Le résumé fourni par la source

Using $482\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of data taken at $\sqrt{s}=4.009\text{ }\text{ }\mathrm{GeV}$, we measure the branching fractions of the decays of ${D}^{*0}$ into ${D}^{0}{\ensuremath{\pi}}^{0}$ and ${D}^{0}\ensuremath{\gamma}$ to be $\mathcal{B}({D}^{*0}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{0})=(65.5\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\pm\else\textpm\fi{}0.5)%$ and $\mathcal{B}({D}^{*0}\ensuremath{\rightarrow}{D}^{0}\ensuremath{\gamma})=\phantom{\rule{0ex}{0ex}}(34.5\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\pm\else\textpm\fi{}0.5)%$, respectively, by assuming that the ${D}^{*0}$ decays only into these two modes. The ratio of the two branching fractions is $\mathcal{B}({D}^{*0}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{0})/\mathcal{B}({D}^{*0}\ensuremath{\rightarrow}{D}^{0}\ensuremath{\gamma})=1.90\ifmmode\pm\else\textpm\fi{}0.07\ifmmode\pm\else\textpm\fi{}0.05$, which is independent of the assumption made above. The first uncertainties are statistical and the second ones systematic. The precision is improved by a factor of 3 compared to the present world average values.

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