Kavli Affiliate: T. Higuchi
| First 5 Authors: , , , ,
| Summary:
We present a study of the rare charm meson decays $ D^0rightarrow
K^+K^-e^+e^- $, $ pi^+pi^-e^+e^- $, and $
K^-pi^+e^+e^- $ using a 942 fb$^-1$ data set collected by the Belle
detector at the KEKB asymmetric-energy $ e^+e^- $ collider. We use $ D^0
$ candidates identified by the charge of the pion in $ D^* rightarrow D^0
pi $ decays and normalize the branching fractions to $ D^0 rightarrow
K^-pi^+pi^-pi^+ $ decays. The branching fraction for decay $ D^0
rightarrow K^-pi^+e^+e^- $ is measured to be (39.6 $pm$ 4.5 (stat)
$pm$ 2.9 (syst)) $times$ $10^-7$, with the dielectron mass in the $
rho/omega $ mass region $ 675 < m_ee < 875 $ MeV$/c^2$. We also search
for $ D^0rightarrow h^- h^(prime)+e^+e^- $ ($ h^(prime)=K,,pi
$) decays with the dielectron mass near the $eta$ and $phi$ resonances, and
away from these resonances for the $ K^+K^-e^+e^- $ and $
pi^+pi^-e^+e^- $ modes. For these modes, we find no significant
signals and set 90$%$ confidence level upper limits on their branching
fractions at the $mathcalO$(10$^-7$) level.
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