The role of Wigner-SU(4) symmetry in light nuclei

Wigner-SU(4) symmetry is a framework where strong interactions are considered independent of both spin and isospin and nucleons transform as spin-isospin quartet states. It was used by Wigner in 1937 to study the masses of nuclear isobar series for a number of nucleons. Additional examples where this symmetry is useful for classifying nuclear behavior continue to be found. In this talk, I will discuss recent studies of light nuclei where the breaking of Wigner-SU(4) symmetry is treated perturbatively. I will focus on three-nucleon bound states and capture reactions in the framework of pionless effective field theory (EFT). In these systems Wigner-SU(4) symmetry provides valuable insights into their scales as well as an alternative EFT power counting. The impact of Coulomb interactions on Wigner-SU(4) symmetry will also be discussed.