Simulating at Realistic Quark Masses: Pseudoscalar Decay Constants and   Chiral Logarithms
  Due to improvements in computer performance and algorithms, the rapidly increasing cost for unquenched Wilson-type fermions with lighter quarks has been ameliorated and new simulations are now possible. Here we present results using two flavours of O(a)-improved Wilson fermions for meson decay constants at pseudoscalar masses down to 320MeV. Results are at several lattice spacings down to about 0.07fm and include a non-perturbative determination of the renormalisation constant. This enables us to attempt contact with (partially quenched) chiral perturbation theory. 
M. G\"ockeler, R. Horsley, Y. Nakamura, D. Pleiter, P. E. L. Rakow, G.   Schierholz, W. Schroers, T. Streuer, H. St\"uben, J...