Extracting the rho resonance from lattice QCD simulations at small quark   masses
  Using established relations between the scattering matrix in infinite volume and the two-particle spectrum in a periodic box, we compute the mass and width of the rho meson from simulations of N_f=2 flavors of dynamical clover fermions at small pion masses 2 m_pi < m_rho. 
M. G\"ockeler, R. Horsley, Y. Nakamura, D. Pleiter, P.E.L. Rakow, G.   Schierholz and J. Zanotti