Recent results from BESIII

TL;DR

This paper reports new experimental results from BESIII, including measurements of meson decays, mixing phenomena, and the observation of new states, advancing understanding of charmonium and light meson interactions.

Contribution

It presents the first measurements of certain decay modes, observations of new states, and detailed analysis of meson mixing and decay processes using large data samples.

Findings

Observation of $X(2120)$ and $X(2370)$ in $pip eta$ spectrum

First observation of $psip og og og$ decays

Measurement of $a^{0}_{0}(980)-f_{0}(980)$ mixing

Abstract

Using about $226\times 10^6$ $\jpsi$ events and $106\times 10^6$ $\psi^{\prime}$ events collected with the BESIII detector at the BEPCII $e^+e^-$ collider, the Dalitz plot of $\etap \to \eta \pi^+ \pi^-$ decay is studied, the direct measurement of $a^{0}_{0}(980)-f_{0}(980)$ mixing is performed, $X(2120)$ and $X(2370)$ are observed in the $\pi^+\pi^-\eta^\prime$ invariant mass spectrum, $\psi^{\prime}\to\gamma\pi^0$ and $\psi^{\prime}\to\gamma\eta$ are observed for the first time, and the decays $\chi_{cJ}\to\gamma V$ ($V=\phi$, $\rho^0$, $\omega$) are studied.