We report on mid-rapidity mass spectrum of di-electrons and cross sections of
pseudoscalar and vector mesons via $e^{+}e^{-}$ decays, from $sqrt{s} = 200$
GeV $p+p$ collisions, measured by the large acceptance experiment STAR at RHIC.
The ratio of the di-electron continuum to the combinatorial background is
larger than 10% over the entire mass range. Simulations of di-electrons from
light-meson decays and heavy-flavor decays (charmonium and open charm
correlation) are found to describe the data. The extracted $omega
ightarrow
e^{+}e^{-}$ invariant yields are consistent with previous measurements. The
mid-rapidity yields ($dN/dy$) of $phi$ and $J/psi$ are extracted through
their di-electron decay channels and are consistent with the previous
measurements of $phi
ightarrow K^{+}K^{-}$ and $J/psi
ightarrow
e^{+}e^{-}$. Our results suggest a new upper limit of the branching ratio of
the $eta
ightarrow e^{+}e^{-}$ of $1.7 imes10^{-5}$ at 90% confidence
level.
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