Effects of Nonperturbative Improvement in Quenched Hadron Spectroscopy
  We discuss a comparative analysis of unimproved and nonperturbatively improved quenched hadron spectroscopy, on a set of 104 gauge configurations, at beta=6.2. We also present here our results for meson decay constants, including the constants f_D and f_Ds in the charm-quark region. 
Attilio Cucchieri, Tereza Mendes and Roberto Petronzio