Stanley F. Radford

Potential model calculations and predictions for

We investigate the spectroscopy and decays of the charm-strange quarkonium system in a potential model consisting of a relativistic kinetic energy term, a linear confining term including its scalar and vector relativistic corrections and the complete perturbative one-loop quantum chromodynamic short distance potential. The masses and wave functions of the various states are obtained using a variational technique, which are then used in a perturbative treatment of the potential to find the mass spectrum of the

\bm c\bar{\bm s}

c\bar{s}

quarkonia

system and radiative decay widths. Our results compare well with the available data for the spectrum of

Note on recent measurements of the {psi}(1S){yields}{gamma}{eta}{sub C}(1S) and {psi}(2S){yields}{gamma}{eta}{sub C}(1S) branching ratios

D_s

Quarkonium Spectra and Quantum Chromodynamics

states. We include a discussion of the effect of mixing and an investigation of the Lorentz nature of the confining potential.

Quark Quark and Quark - Anti-quark Potentials

Recently published measurements of the branching ratios B({psi}(1S){yields}{gamma}{eta}{sub C}(1S)) and B({psi}(2S){yields}{gamma}{eta}{sub C}(1S)) by the CLEO Collaboration are examined in the context of a potential model that includes both relativistic and one-loop QCD corrections to the quark-antiquark interaction. The prediction for the width {gamma}({psi}(1S){yields}{gamma}{eta}{sub C}(1S)) is in excellent agreement with the new data, but the prediction for {gamma}({psi}(2S){yields}{gamma}{eta}{sub C}(1S)) is too small. In an effort to understand this discrepancy, we derive an upper bound on {gamma}({psi}(2S){yields}{gamma}{eta}{sub C}(1S)) and point out its experimental value saturates this bound.