G. Chen

Search for a muonphilic scalar $X_{0}$ or vector $X_{1}$ via $J/ψ\toμ^+μ^-+\rm{invisible}$ decays at BESII

BESIII Collaboration, М. Н. Ачасов, P. Adlarson, X. Ai et autres

A light scalar $X_{0}$ or vector $X_{1}$ particles have been introduced as a possible explanation for the $(g-2)_μ$ anomaly and dark matter phenomena. Using $(8.998\pm 0.039)\times10^9$ $\jpsi $ events collected by the BESIII detector, we search for a light muon philic scalar …

Search for intermediate resonances and dark gauge bosons in J/ψ→γπ0η′

М. Н. Ачасов, P. Adlarson, S. Ahmed, M. Albrecht et autres

We report on an analysis of the decay $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{0}{\ensuremath{\eta}}^{\ensuremath{'}}$ using a sample of $(1310.6\ifmmode\pm\else\textpm\fi{}7.0)\ifmmode\times\else\texttimes\fi{}{10}^{6}J/\ensuremath{\psi}$ events collected with the BESIII detector. We search for the $CP$-violating process ${\ensuremath{\eta}}_{c}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\eta}}^{\ensuremath{'}}$ and a dark gauge boson ${U}^{\ensuremath{'}}$ in $J/\ensuremath{\psi}\ensuremath{\rightarrow}{U}^{\ensuremath{'}}{\ensuremath{\eta}}^{\ensuremath{'}},{U}^{\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{0},{\ensuremath{\pi}}^{0}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$. No evidence of an ${\ensuremath{\eta}}_{c}$ signal is …

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