Search for the rare decay $J/ψ\to γD^0+c.c.$ at BESIII
BESIII Collaboration, М. Н. Ачасов, P. Adlarson, O. Afedulidis et autres
Using $(10087\pm44)\times10^6J/ψ$ events collected with the BESIII detector, we search for the rare decay $J/ψ\to γD^0+c.c.$ for the first time. No obvious signal is observed and the upper limit on the branching fraction is determined to be ${\cal B}(J/ψ\to γD^{0}+c.c.)< 9.1 \times …