Scattering in the pion-nucleon negative parity channel in lattice QCD

Understand

We study the coupled pion-nucleon system (negative parity, isospin 1/2) based on a lattice QCD simulation for nf=2 mass degenerate light quarks.

• Both, standard 3-quarks baryon operators as well as meson-baryon (4+1)-quark operators are included.
• This is an exploratory study for just one lattice size and lattice spacing and at a pion mass of 266 MeV.
• Using the distillation method and variational analysis we determine energy levels of the lowest eigenstates.