Correlation functions at small quark masses with overlap fermions
  We report on recent work on the determination of low-energy constants describing Delta{S}=1 weak transitions, in order to investigate the origins of the Delta{I}=1/2 rule. We focus on numerical techniques designed to enhance the statistical signal in three-point correlation functions computed with overlap fermions near the chiral limit. 
L. Giusti, P. Hernandez, M. Laine, C. Pena, P. Weisz, J. Wennekers and   H. Wittig