| Abstract: | Hadronic transitions of $chi_{cJ} o eta_{c}pi^{+}pi^{-}$ (J=0, 1, 2) are
searched for using a sample of $1.06 imes 10^{8}$ $psi(3686)$ events
collected with the BESIII detector at the BEPCII storage ring. The $etac$ is
reconstructed with $K_{S}^{0}K^{+}pi^{-}+c.c.$ and $K^{+}K^{-}pi^{0}$ final
states. No signals are observed in any of the three $chi_{cJ}$ states in
either $etac$ decay mode. At the 90% confidence level, the upper limits are
determined to be $BR(chi_{c0} o eta_{c}pi^{+}pi^{-})<0.07%$,
$BR(chi_{c1} o eta_{c}pi^{+}pi^{-})<0.32%$, and $BR(chi_{c2} o
eta_{c}pi^{+}pi^{-})<0.54%$. The upper limit of $BR(chi_{c1} o
eta_{c}pi^{+}pi^{-}$ is lower than the existing theoretical prediction by
almost an order of magnitude. The branching fractions of $chi_{cJ} o
K_{S}^{0}K^{+}pi^{-}pi^{+}pi^{-}+c.c.$, $K^{+}K^{-}pi^{+}pi^{-}pi^{0}$,
$omega K^{+}K^{-}$ and $phipi^{+}pi^{-}pi^{0}$ (J=0, 1, 2) are measured
for the first time. |
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