Search for a light exotic particle in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>radiative decays
Search for a light exotic particle in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>radiative decays
Using a data sample containing $1.06\ifmmode\times\else\texttimes\fi{}{10}^{8}$ ${\ensuremath{\psi}}^{\ensuremath{'}}$ events collected with the BESIII detector at the BEPCII electron-positron collider, we search for a light exotic particle $X$ in the process ${\ensuremath{\psi}}^{\ensuremath{'}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$, $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}X$, $X\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$. This light particle $X$ could be a Higgs-like boson ${A}^{0}$, a spin-1 $U$ boson, or a pseudoscalar sgoldstino …