| Abstract: | Based on a sample of $(1310.6 pm 7.0) imes 10^6~J/psi$ events collected
with the BESIII detector, we present measurements of $J/psi$ and $eta^prime$
absolute branching fractions using the process
$J/psi
ightarrowgammaeta^prime$. By analyzing events where the radiative
photon converts into an $e^+e^-$ pair, the branching fraction for $J/psi
ightarrow gamma eta^prime$ is measured to be $(5.27pm0.03pm0.05) imes
10^{-3}$. The absolute branching fractions of the five dominant decay channels
of the $eta^prime$ are then measured independently for the first time and are
determined to be $mathcal{B}(eta^prime
ightarrow gamma pi^{+} pi^{-})$
= (29.90$pm$0.03$pm$0.55)%, $mathcal{B}(eta^prime
ightarrow eta pi^{+}
pi^{-})$ = (41.24$pm$0.08$pm$1.24)%, $mathcal{B}(eta^prime
ightarrow
eta pi^{0} pi^{0})$ = (21.36$pm$0.10$pm$0.92)%, $mathcal{B}(eta^prime
ightarrow gamma omega)$ = (2.489$pm$0.018$pm$0.074)%, and
$mathcal{B}(eta^prime
ightarrow gamma gamma)$ =
(2.331$pm$0.012$pm$0.035)%, where the first uncertainties are statistical and
the second systematic. |
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