Four-body systems in EFTs with contact interactions

Four-body systems of nucleons and/or cold atoms have been studied using EFTs with two- and three-body contact interactions. I will share some recent progress on four-body calculations, with a focus on four-body binding energies. Impact of the effective range and four-body force will also be discussed. These calculations are important for studying static properties of four-body bound states, such as helium-4 nuclei, and four-body scattering up to NLO in contact EFTs.