Measurements of Branching Ratios for $��$ Decays into Charged Particles

The WASA-at-COSY experiment has collected $3\times10^{7}$ events with $��$-mesons produced via the reaction $pd\rightarrow{^{3}\textrm{He}}��$ at $\textrm{T} = 1.0 \textrm{GeV}$. Using this data set, we evaluate the branching ratios of the decays $��\to��^{+}��^{-}��$, $��\to e^{+}e^{-}��$, $��\to��^{+}��^{-}e^{+}e^{-}$ and $��\to e^{+}e^{-}e^{+}e^{-}$. The branching ratios are normalized to the $��\rightarrow��^{+}��^{-}��^{0}$ decay. In addition an upper limit on a $CP$-violating asymmetry in $��\rightarrow ��^{+}��^{-}e^{+}e^{-}$ is extracted.