Measurement of the absolute branching fractions of Λc+→Ληπ+ and Σ(1385)+η

Le résumé fourni par la source

We study the decays ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}\ensuremath{\eta}{\ensuremath{\pi}}^{+}$ and $\mathrm{\ensuremath{\Sigma}}(1385{)}^{+}\ensuremath{\eta}$ based on ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}^{\ensuremath{-}}$ pairs produced in ${e}^{+}{e}^{\ensuremath{-}}$ collisions at a center-of-mass energy of $\sqrt{s}=4.6\text{ }\text{ }\mathrm{GeV}$, corresponding to an integrated luminosity of $567\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. The data sample was accumulated with the BESIII detector at the BEPCII collider. The branching fractions are measured to be $\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}\ensuremath{\eta}{\ensuremath{\pi}}^{+})=(1.84\ifmmode\pm\else\textpm\fi{}0.21(\text{stat})\ifmmode\pm\else\textpm\fi{}0.15(\text{syst}))%$ and $\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Sigma}}(1385{)}^{+}\ensuremath{\eta})=\phantom{\rule{0ex}{0ex}}(0.91\ifmmode\pm\else\textpm\fi{}0.18(\text{stat})\ifmmode\pm\else\textpm\fi{}0.09(\text{syst}))%$, constituting the most precise measurements to date.

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