Measurement of $\chi_{cJ}$ decaying into $p\bar{n}\pi^{-}$ and $p\bar{n}\pi^{-}\pi^{0}$

TL;DR

This study measures the decay rates of $oldsymbol{ ext{chi}_cJ}$ particles into specific baryon-antibaryon-pion final states using BESIII data, providing more precise results and first observations for some decay modes.

Contribution

First-time observation of certain $oldsymbol{ ext{chi}_cJ}$ decays and more precise measurements of previously known decay modes using a large BESIII dataset.

Findings

More precise branching fraction measurements for $ ext{chi}_c0$ and $ ext{chi}_c2$ decays.

First observation of $ ext{chi}_c1 o par{n}\pi^-$ and $ ext{chi}_cJ o par{n}\pi^-\pi^0$ decays.

Results are consistent with previous data but significantly more accurate.

Abstract

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.