Study of charmonium spectroscopy at BESIII

TL;DR

This paper reports on the measurement of charmonium spin singlet states below the open charm threshold, including their masses, widths, and production rates, based on extensive data from the BESIII experiment.

Contribution

It provides new experimental measurements of h_c, η_c, and η_c(2S) states, enhancing understanding of charmonium spectroscopy below the open charm threshold.

Findings

Measured masses and widths of h_c, η_c, η_c(2S)

Determined production rates of these states

Improved precision over previous measurements

Abstract

In this talk, we will present the results on the charmonium spin singlet states below the open charm threshold, including h_c, \eta_c, and \eta_c(2S). The masses, widthes, and production rates of these states will be reported. The results are based on a data sample of 106 million \psi' events collected with the BESIII experiments at the BEPCII collider.