# Partial-wave analysis of $J/\psi\to K^+K^-\pi^0$

## TL;DR

This study performs a detailed partial-wave analysis of the decay $J/ar{ ext{}}$\psi\to K^+K^-\pi^0$ using a large dataset, revealing new resonant states and providing more precise branching fractions, with results differing from previous experiments.

## Contribution

First observation of $K^*_2(1980)^ ext{\pm}$ and $K^*_4(2045)^ ext{\pm}$ in $J/\psi$ decays using partial-wave analysis.

## Key findings

- Identification of $K^*_2(1430)^ ext{\pm}$, $K^*_2(1980)^ ext{\pm}$, and $K^*_4(2045)^ ext{\pm}$ contributions.
- First observation of certain resonances in $J/\psi$ decays.
- More precise measurement of $B(J/\psi\to K^+K^-\pi^0)$.

## Abstract

A partial-wave analysis of the decay $J/\psi \to K^+K^-\pi^0$ has been made using $(223.7\pm1.4)\times 10^{6}$ $J/\psi$ events collected with the BESIII detector in 2009. The analysis, which is performed within the isobar-model approach, reveals contributions from $K^*_2(1430)^\pm$, $K^*_2(1980)^\pm$ and $K^*_4(2045)^\pm$ decaying to $K^\pm\pi^0$. The two latter states are observed in $J/\psi$ decays for the first time. Two resonance signals decaying to $K^+K^-$ are also observed. These contributions can not be reliably identified and their possible interpretations are discussed. The measured branching fraction $B(J/\psi \to K^+K^-\pi^0)$ of $(2.88\pm0.01\pm0.12)\times10^{-3}$ is more precise than previous results. Branching fractions for the reported contributions are presented as well. The results of the partial-wave analysis differ significantly from those previously obtained by BESII and BABAR.