Measurement of $\chi_{cJ}$ decaying into $p\bar{n}\pi^{-}$ and   $p\bar{n}\pi^{-}\pi^{0}$
  Using a data sample of $1.06 \times 10^{8}$ $\psip$ events collected with the BESIII detector in 2009, the branching fractions of $\chi_{cJ}\to p\bar{n}\pi^{-}$ and $\chi_{cJ}\to p\bar{n}\pi^{-}\pi^{0}$ ($J$=0,1,2) are measured{Throughout the text, inclusion of charge conjugate modes is implied if not stated otherwise.}. The results for $\chi_{c0}\to p\bar{n}\pi^{-}$ and $\chi_{c2}\to p\bar{n}\pi^{-}$ are consistent with, but much more precise than those of previous measurements. The decays of $\chi_{c1}\to p\bar{n}\pi^{-}$ and $\chi_{cJ}\to p\bar{n}\pi^{-}\pi^{0}$ are observed for the first time. 
M. Ablikim, M. N. Achasov, O. Albayrak, D. J. Ambrose, F. F. An, Q.   An, J. Z. Bai, Y. Ban, J. Becker, J. V. Bennett, M. Be...
hep-ex