Improved measurement of the branching fraction of $h_{c}\rightarrow\gamma\eta^\prime/\eta$ and search for $h_{c}\rightarrow\gamma\pi^0$

TL;DR

This study measures the branching fractions of $h_c$ decays to $ o ext{gamma} ext{eta}$ and $ o ext{gamma} ext{eta}^ extprime$, with the first observation of $h_c o ext{gamma} ext{eta}$ and an improved limit on $h_c o ext{gamma} ext{pi}^0$, enhancing understanding of $ ext{eta}- ext{eta}^ extprime$ mixing.

Contribution

First observation of $h_c o ext{gamma} ext{eta}$ decay and precise measurement of branching fractions, providing new insights into $ ext{eta}- ext{eta}^ extprime$ mixing within QCD.

Findings

$h_c o ext{gamma} ext{eta}$ observed with 9.0$\sigma$ significance

Branching fraction of $h_c o ext{gamma} ext{eta}$ measured as $(3.77 extpm0.55 extpm0.13 extpm0.26) imes10^{-4}$

Upper limit set on $h_c o ext{gamma} ext{pi}^0$ decay at $5.0 imes10^{-5}$

Abstract

The processes $h_c\to\gamma P(P = \eta^\prime,~\eta,~\pi^0)$ are studied with a sample of $(27.12\pm0.14)\times10^{8}$ $\psi(3686)$ events collected by the BESIII detector at the BEPCII collider. The decay $h_{c}\rightarrow\gamma\eta$ is observed for the first time with the significance of $9.0\,\sigma$, and the branching fraction is determined to be $(3.77\pm0.55\pm0.13\pm0.26)\times10^{-4}$, while $\mathscr{B}(h_{c}\rightarrow\gamma\eta^\prime)$ is measured to be $(1.40\pm0.11\pm0.04\pm0.10)\times10^{-3}$, where the first uncertainties are statistical, the second systematic, and the third from the branching fraction of $\psi(3686)\rightarrow\pi^{0}h_c$. The combination of these results allows for a precise determination of $R_{h_c}=\frac{\mathscr{B}(h_c\rightarrow\gamma\eta)}{\mathscr{B}(h_c\rightarrow\gamma\eta^\prime)}$, which is calculated to be $(27.0\pm4.4\pm1.0)\%$. The results are valuable for gaining a deeper understanding of $\eta-\eta^\prime$ mixing, and its manifestation within quantum chromodynamics. No significant signal is found for the decay $h_c\rightarrow\gamma\pi^{0}$, and an upper limit is placed on its branching fraction of $\mathscr{B}(h_c\rightarrow\gamma\pi^{0})<5.0\times10^{-5}$, at the 90$\%$ confidence level.