News from BESIII

TL;DR

BESIII, a state-of-the-art detector at BEPCII, has collected extensive data on charmonium and light-hadron decays, enabling new insights into hadron spectroscopy, isospin violation, and glueball candidates.

Contribution

This paper reports new experimental results from BESIII, including observations of isospin violation, glueball candidates, and precise measurements of charmonium states, advancing understanding in light-hadron physics.

Findings

Observation of large isospin violation in eta(1405) decays

Detection of two glueball candidate states

Precision measurements of eta_c and h_c lineshapes

Abstract

BESIII is a new state-of-the-art 4pi detector at the recently upgraded BEPCII two-ring e+e- collider at the Institute of High Energy Physics in Beijing. It has been in operation for three years, during which time it has collected the world's largest data samples of J/psi, psi' and psi(3770) decays. These data are being used to make a variety of interesting and unique studies of light-hadron spectroscopy, precision charmonium physics and high-statistics measurements of D-meson decays. Results that I describe in this report include studies of ao(980)-fo(980) mixing, an observation of a large isospin-violation in eta(1405)-->pi0fo(980) decays, some puzzles in J/psi and psi' decays to light hadrons, the observation of two glueball candidate states in radiative J/psi-->gamma pi+pi-eta' decays and some recent precision measurements of eta_c and h_c lineshapes.