Measurements of the branching fractions of $η_c\to K^+K^-π^0$, $K^0_S K^{\pm}π^{\mp}$,$2(π^+π^-π^0)$, and $p \bar{p}$

Abstract

Using data samples collected with the BESIII detector at center-of-mass energies $\sqrt{s} = 4.23, 4.26, 4.36,$ and $4.42$~\rm{GeV}, we measure the branching fractions of $η_c\to K^+K^-π^0$, $K^0_S K^{\pm}π^{\mp}$, $2(π^+π^-π^0)$, and $p \bar{p}$, via the process $e^+e^-\toπ^+π^-h_c$, $h_c\toγη_c$. The corresponding results are $(1.15\pm0.12\pm0.10)\%$, $(2.60\pm0.21\pm0.20)\%$, $(15.2\pm1.8\pm1.7)\%$, and $(0.120\pm0.026\pm0.015)\%$, respectively. Here the first uncertainties are statistical, and the second ones systematic. Additionally, the charged track multiplicity of $η_c$ decays is measured for the first time.