Nucleon excited states in Nf = 2 lattice QCD.

We investigate the excited states of the nucleon using Nf=2 twisted mass gauge configurations with pion masses in the range of about 270 to 450 MeV and one ensemble of Nf=2 Clover fermions at almost physical pion mass. We use two different sets of variational bases and study the resulting generalized eigenvalue problem. We present results for the two lowest positive and negative parity states. [ABSTRACT FROM AUTHOR]