Observation of Λc+→nKS0π+

Le résumé fourni par la source

We report the first direct measurement of decays of the ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ baryon involving the neutron. The analysis is performed using $567\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collision data collected at $\sqrt{s}=4.599\text{ }\text{ }\mathrm{GeV}$ with the BESIII detector at the BEPCII collider. We observe the decay ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}n{K}_{S}^{0}{\ensuremath{\pi}}^{+}$ and measure the absolute branching fraction to be $\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}n{K}_{S}^{0}{\ensuremath{\pi}}^{+})=[1.82\ifmmode\pm\else\textpm\fi{}0.23(\text{stat})\ifmmode\pm\else\textpm\fi{}0.11(\text{syst})]%$. A comparison to $\mathcal{B}[{\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p(\overline{K}\ensuremath{\pi}{)}^{0}]$ provides an important test of isospin symmetry and final state interactions.

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