The Hyperfine Splitting in Charmonium: Lattice Computations Using the Wilson and Clover Fermion Actions

UKQCD Collaboration, C. R. Allton, C. T. Sachrajda +10

We compute the hyperfine splitting $m_{J/\psi }-m_{{\eta }_c}$ on the lattice, using both the Wilson and $O(a)$-improved (clover) actions for quenched quarks. The computations are performed…