Measurement ofχcjdecaying intopn¯π−andpn¯π−π0
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Abstract
Using a data sample of $1.06\ifmmode\times\else\texttimes\fi{}{10}^{8}$ ${\ensuremath{\psi}}^{\ensuremath{'}}$ events collected with the BESIII detector in 2009, the branching fractions of ${\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}p\overline{n}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}p\overline{n}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ ($J=0$, 1, 2) are measured. (Throughout the text, inclusion of charge conjugate modes is implied if not stated otherwise.) The results for ${\ensuremath{\chi}}_{c0}\ensuremath{\rightarrow}p\overline{n}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${\ensuremath{\chi}}_{c2}\ensuremath{\rightarrow}p\overline{n}{\ensuremath{\pi}}^{\ensuremath{-}}$ are consistent with, but much more precise than, those of previous measurements. The decays of ${\ensuremath{\chi}}_{c1}\ensuremath{\rightarrow}p\overline{n}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}p\overline{n}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ are observed for the first time.
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