Particle physicists are most interested in baryons with no orbital angular momentum ("L" = 0), as they correspond to ground states—states of minimal energy. Therefore, the two groups of baryons most studied are the "S" = ; "L" = 0 and "S" = ; "L" = 0, which corresponds to "J" = + and "J" = +, respectively, although they are not the only ones. It is also possible to obtain "J" = + particles from "S" =  and "L" = 2, as well as "S" =  and "L" = 2. This phenomenon of having multiple particles in the same total angular momentum configuration is called "degeneracy". How to distinguish between these degenerate baryons is an active area of research in baryon spectroscopy.