Search for a $CP$-odd light Higgs boson in $J/\psi \to \gamma A^0$

BESIII Collaboration, M. Ablikim, M. N. Achasov +502

Using $J/\psi$ radiative decays from 9.0 billion $J/\psi$ events collected by the BESIII detector, we search for di-muon decays of a $CP$-odd light Higgs boson ($A^0$), predicted by many…