Charmonium Spectrum from Quenched QCD with Overlap Fermions
  We present preliminary results using overlap fermions for the charmonium spectrum, in particular for hyperfine splitting. Simulations are performed on $16^3 \times 72$ lattices, with Wilson gauge action at $\beta=6.3345$. Depending on how the scale is set, we obtain 104(5) MeV (using $1\bar{P}-1\bar{S}$) or 88(4) MeV (using $r_0$=0.5 fm) for the hyperfine splitting. 
S. Tamhankar, A. Alexandru, Y. Chen, S. J. Dong, T. Draper, I.   Horvath, F. X. Lee, K. F. Liu, N. Mathur and J. B. Zhang