Sunset integrals at finite volume

Understand

Chiral Perturbation Theory is a useful tool to aid in performing the various extrapolations needed in lattice QCD calculations of physical quantities.

• These include extrapolations in quark mass, finite lattice spacing and finite size of the lattice.
• Especially the latter will become more important when the quark masses on the lattice become smaller.
• Here we develop the needed two-loop integrals at finite volume to do the calculations for masses and decay constants for all general mass cases.