Scaling test of two-flavor O(a)-improved lattice QCD
  We report on a scaling test of several mesonic observables in the non-perturbatively O(a) improved Wilson theory with two flavors of dynamical quarks. The observables are constructed in a fixed volume of 2.4fm x (1.8fm)^3 with Schroedinger functional boundary conditions. No significant scaling violations are found. Using the kaon mass determined in \cite{cernI}, we update our estimate of the Lambda parameter to Lambda^(2)_{msbar}/m_K = 0.52(6). 
Michele Della Morte, Patrick Fritzsch, Harvey B. Meyer, Hubert Simma,   Rainer Sommer, Shinji Takeda, Oliver Witzel, Ulli Wolff