Measurement of the Branching Fraction for the Decay $\chi_{cJ}\to p\bar{p}\eta\pi^{0}$

TL;DR

This paper reports the first measurements of the decay branching fractions of $ ext{chi}_{cJ}$ particles into $par{p} ext{eta} ext{pi}^0$ using a large dataset from the BESIII detector, providing new insights into charmonium decays.

Contribution

The study presents the first observation and measurement of the branching fractions for $ ext{chi}_{cJ} o par{p} ext{eta} ext{pi}^0$ decays, expanding knowledge of charmonium decay modes.

Findings

Branching fraction for $ ext{chi}_{c0}$ decay: $(2.41 imes 10^{-4})$

Branching fraction for $ ext{chi}_{c1}$ decay: $(1.95 imes 10^{-4})$

Branching fraction for $ ext{chi}_{c2}$ decay: $(1.31 imes 10^{-4})$

Abstract

Using $(2712.4\pm 14.3)\times10^6 \psi(3686)$ events collected by the BESIII detector operating at the BEPCII collider, we present the first observations of the decays $\chi_{cJ}(J=0,1,2)\to p\bar{p}\eta\pi^{0}$. Their decay branching fractions are determined to be ${\cal B}(\chi_{c0}\to p\bar{p}\eta\pi^{0})=({2.41 \pm 0.07 \pm 0.19}) \times 10^{-4}$, ${\cal B}(\chi_{c1}\to p\bar{p}\eta\pi^{0})=({1.95 \pm 0.05 \pm 0.12}) \times 10^{-4}$, and ${\cal B}(\chi_{c2}\to p\bar{p}\eta\pi^{0})=({1.31 \pm 0.05 \pm 0.08}) \times 10^{-4}$, where the first uncertainties are statistical and the second systematic.