Simulating at Realistic Quark Masses: Light quark masses
  We present new results for light quark masses. The calculations are performed using two flavours of $O(a)$ improved Wilson fermions. We have reached lattice spacings as small as $a \sim 0.07$fm and pion masses down to $m_{\pi} \sim 340$MeV in our simulations. This gives us significantly better control on the chiral and continuum extrapolations. 
M. G\"ockeler, R. Horsley, Y. Nakamura, D. Pleiter, P. E. L. Rakow, G.   Schierholz, T. Streuer, H. St\"uben, J. M. Zanotti