The Λ(1405) in Full QCD.

At 1405.1 MeV, the lowest-lying negative-parity state of the Λ baryon lies surprising low. Indeed, this is lower than the lowest negative-parity state of the nucleon, even though the Λ(1405) possesses a valence strange quark. However, previous Lattice QCD studies have been unable to identify such a low-lying state. Using the PACS-CS (2+1)-flavour full-QCD ensembles, available through the ILDG, we utilise a variational analysis with source and sink smearing to isolate this elusive state. We find three low-lying odd-parity states, and for the first time reproduce the correct level ordering with respect to the nearby scattering thresholds. [ABSTRACT FROM AUTHOR]