Hadronic Physics at CLEO-c

TL;DR

This paper presents preliminary results from CLEO-c on charmonium states, providing insights into QCD effects, gluon dynamics, and glueball mixing through various decay measurements and mass determinations.

Contribution

It reports new measurements of charmonium decay branching fractions, the h_c mass, and transition rates, advancing understanding of hadronic physics and QCD phenomena.

Findings

Measured two-body branching fractions of chi_cJ decays

Determined the h_c mass with high precision

Observed results on the hindered M1 transition psi(2S) -> gamma eta_c

Abstract

The charmonium system provides an opportunity to explore a wide variety of topics in hadronic physics. Studies of the properties of and transitions among cc-bar states yield insight into relativistic and non-perturbative QCD effects. At the same time, studies of the decays of charmonium states are a window into gluon dynamics and the role of glueball mixing in the production of light quark states. A collection of preliminary results utilizing the full CLEO-c psi(2S) data sample is presented including two-body branching fractions of chi_cJ decays, a precision measurement of the h_c mass, and results on the hindered M1 transition: psi(2S) -> gamma eta_c.