CERN Accelerating science

\epsilon_\text{\hhee}-6

\epsilon_\text{\hhee}-6

Mass distributions of selected $D^0 \rightarrow \pi^+\pi^-e^+e^-$ candidates in the low-$m(e^+e^-)$, $\eta$, $\rho^0/\omega$, $\phi$ and high-$m(e^+e^-)$ regions in the (left, $0\gamma$) no-brem and (right, $\geq 1\gamma$) with-brem categories. Fit projections are also shown.

Mass distributions of selected $D^0 \rightarrow K^+K^-e^+e^-$ candidates in the low-$m(e^+e^-)$, $\eta$ and $\rho^0/\omega$ regions in the (left) no-brem ($0\gamma$) and (right) with-brem ($\geq 1\gamma$) categories. Fit projections are also shown.

Distributions of $m(D^0)$ for selected $D^0 \rightarrow K^-\pi^-[e^+e^-]_{\rho^0/\omega}$ candidates in the dielectron-mass region between 675--875 {Me\kern -0.1em V\!/}$c^2$ split within no-brem and with-brem categories, with the selection optimized for (left) $D^0 \rightarrow \pi^+\pi^-e^+e^-$ and (right) $D^0 \rightarrow K^+K^-e^+e^-$ decays. Fit projections are also shown.

Distributions of $m(D^0)$ for selected $D^0 \rightarrow K^-\pi^-[e^+e^-]_{\rho^0/\omega}$ candidates in the dielectron-mass region between 675--875 {Me\kern -0.1em V\!/}$c^2$ split within no-brem and with-brem categories, with the selection optimized for (left) $D^0 \rightarrow \pi^+\pi^-e^+e^-$ and (right) $D^0 \rightarrow K^+K^-e^+e^-$ decays. Fit projections are also shown.