Baryons

Nomenclature

• Baryons with (any combination of) three u and/or d quarks are Ns (I = ⁠1/2⁠) or Δ baryons (I = ⁠3/2⁠).
• Baryons containing two u and/or d quarks are Λ baryons (I = 0) or Σ baryons (I = 1). If the third quark is heavy, its identity is given by a subscript.
• Baryons containing one u or d quark are Ξ baryons (I = ⁠1/2⁠). One or two subscripts are used if one or both of the remaining quarks are heavy.
• Baryons containing no u or d quarks are Ω baryons (I = 0), and subscripts indicate any heavy quark content.
• Baryons that decay strongly have their masses as part of their names. For example, Σ does not decay strongly, but Δ(1232) does.