Scaling of nonperturbativelyO(a)-improved Wilson fermions: Hadron spectrum, quark masses, and decay constants

We compute the hadron mass spectrum, the quark masses, and the meson decay constants in quenched lattice QCD with nonperturbatively $O\left(a\right)\mathrm{}$-improved Wilson fermions. The calculations are done for two values of the coupling constant $\beta =6.0\mathrm{}$ and 6.2, and the results are compared with the predictions of ordinary Wilson fermions. We find that the improved action reduces lattice artifacts as expected.