Some physics literature says Horizontal Symmetry of gauge theory, such as this paper, available also at arXiv.
What does this Horizontal Symmetry of gauge theory or Horizontal gauge group mean? Does that mean the symmetry group in the same energy scale (horizontal, not go up or down of an energy scale)?
People speak about the Horizontal Symmetry, such as in the Symmetry for 3 family of leptons and quarks.
This post imported from StackExchange Physics at 2020-12-03 13:05 (UTC), posted by SE-user annie marie heart