Title: Evolution of the $$\bar K N - \pi \Sigma$$ system with $$M^2_\pi$$ in a box from U$$\chi$$PT

The L ( 1405 ) baryon is difficult to detect in experiment, absent in many quark model calculations, and supposedly manifested through a two-pole structure. Its uncommon properties made it subject to numerous experimental and theoretical studies in recent years. Finite-volume Lattice-QCD eigenvalues for different quark masses were recently reported by the Adelaide group. We compare these eigenvalues to predictions of a model based on Unitary Chiral Perturbation Theory. The UCHPT calculation predicts the quark mass dependence remarkably well. It also explains the overlap pattern with different meson-baryon components, mainly p S and KN , at different quark masses. More accurate Lattice QCD data are required to draw definite conclusions on the nature of the L ( 1405 ) .