Decay constants from twisted mass QCD
  We present results for chiral extrapolations of the mass and decay constants of the rho meson. The data sets used are the nf=2 unquenched gauge configurations generated with twisted mass fermions by the European Twisted Mass Collaboration. We describe a calculation of three decay constants in charmonium and explain why they are required. 
ETM Collaboration: P. Dimopoulos, C. McNeile, C. Michael, S. Simula,   and C. Urbach