Light meson decays at BESIII

Abstract

The world's largest sample of $J/\psi$ events accumulated at the BESIII dector offers a unique opportunity to investigate $\eta$ and ${\eta }^{\prime }$ physics via two body $J/\psi$ radiative or hadronic decays. In recent years the BESIII experiment has made significant progresses in $\eta /{\eta }^{\prime }$ decays. A selection of recent highlights in light meson spectroscopy at BESIII are reviewed in this report, including the observation of ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$, the study of ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{e}^{+}{e}^{-}$, and search for $CP$-violation in this decay, search for the rare decays of ${\eta }^{\prime }\to 4{\pi }^0$ and ${\eta }^{\prime }\to \gamma \gamma \eta$, as well as the precision measurement of the branching fraction of ${\eta }^{\prime }$ decays.

7 pages, 4 figures