Charmed Baryons - Nomenclature

Nomenclature

The nomenclature of charmed baryons is based on both quark content and isospin. The naming follows the rules established by the Particle Data Group.

• Charmed baryons composed of one charm quark and two up, one up and one down, or two down quarks are known as charmed Lambdas (Λ
  c, isospin 0), or charmed Sigmas (Σ
  c, isospin 1).
• Charmed baryons of isospin composed of one charm quark, and one up or down quark are known as charmed Xis (Ξ
  c) and all have isospin 1⁄₂.
• Charmed baryons composed of one charm quark and no up or down quarks are called charmed Omegas (Ω
  c) and all have isospin 0.
• Charmed baryons composed of two charm quarks and one up or down quark are called double charmed Xis (Ξ
  cc) and all have isospin 1⁄₂).
• Charmed baryons composed of two charm quarks and no up or down quarks are called double charmed Omega (Ω
  cc) and all have isospin 0.
• Charmed baryons composed of three charm quarks are called triple charmed Omegas (Ω
  ccc), and all have isospin 0.

Charge is indicated with superscripts. Heavy quark (bottom, charm, or top quarks) content is indicated by subscripts. For example a Ξ+
cb is made of one bottom, one charmed quark, and it can be deduced from the charge of the charm (+2⁄₃e) and bottom quark (−1⁄₃e) that the other quark must be an up quark (+2⁄₃e). Sometimes asterisks or primes are used to indicate a resonance.