An overview of $\eta$ and ${\eta }^{\prime }$ decays at BESIII

Abstract

The world's largest sample of 1.31 billion $J/\psi$ events accumulated at the BESIII detector, provides a unique opportunity to investigate $\eta$ and ${\eta }^{\prime }$ physics via two body $J/\psi$ radiative or hadronic decays. For many ${\eta }^{\prime }$ decay channels the low background data samples are up to three orders of magnitude larger than collected in any previous experiment. Here we review the most significant results on $\eta$ and ${\eta }^{\prime }$ obtained at BESIII so far. The analyses range from detailed studies of the common decays dynamics, observations of new radiative and Dalitz decays, and search for rare/forbidden decays with sensitivity up to $\mathcal{B}\sim 10^{-5}$. Finally, prospects of the forthcoming runs at $J/\psi$ peak for the $\eta$ and ${\eta }^{\prime }$ physics are discussed.

arXiv comment17pages. 20 figures

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Cited by in corpus (13)

• Precision tests of fundamental physics with $\eta$ and ${\eta }^{\prime }$ mesons
• Etaprime and Eta Mesons with Connection to Anomalous Glue
• Probing Invisible Vector Meson Decays with NA64 and LDMX
• A theoretical analysis of the doubly radiative decays ${\eta }^{(\prime )}\to {\pi }^0\gamma \gamma$ and ${\eta }^{\prime }\to \eta \gamma \gamma$
• Radiative corrections to the ${\eta }^{(\prime )}$ Dalitz decays
• A theoretical analysis of the semileptonic decays ${\eta }^{(\prime )}\to {\pi }^0{l}^{+}{l}^{-}$ and ${\eta }^{\prime }\to \eta l^{+}{l}^{-}$
• Investigating $D_s^{+}\to {\pi }^0{\ell }^{+}{\nu }_{\ell }$ decay process within QCD sum rule approach
• Scouring meson decays for true muonium
• Search for the rare decay ${\eta }^{\prime }\to {\pi }^0{\pi }^0{\pi }^0{\pi }^0$ at BESIII
• Study of the isospin breaking decay $\mathbf{Y}(2175)\to \mathbf{\varphi }{\mathbf{f}}_0(980)\to \mathbf{\varphi \eta }{\mathbf{\pi }}^0$ at BESIII
• Semileptonic Decay of $D_s^{+}\to {\pi }^0{\ell }^{+}{\nu }_{\ell }$ Via Neutral Meson Mixing
• Study of $a_0^0(980)$-$f_0(980)$ mixing from $a_0(1450)\to a_0^0(980)f_0(500)\to {\pi }^{+}{\pi }^{-}{f}_0(500)$
• Novel approach to investigate $\eta$ decays via ${\eta }^{\prime }\to \pi \pi \eta$