Baryons | Quarks | Conservation laws

Baryon number

In particle physics, the baryon number is a strictly conserved additive quantum number of a system. It is defined as where nq is the number of quarks, and nq is the number of antiquarks. Baryons (three quarks) have a baryon number of +1, mesons (one quark, one antiquark) have a baryon number of 0, and antibaryons (three antiquarks) have a baryon number of โˆ’1. Exotic hadrons like pentaquarks (four quarks, one antiquark) and tetraquarks (two quarks, two antiquarks) are also classified as baryons and mesons depending on their baryon number. (Wikipedia).

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Quark model | Lepton number | Mutability | Pentaquark | Supersymmetry | Neutrino | Hypercharge | Isospin | Electric charge | Lepton | Quark | Electron | Baryon | Proton decay | Muon | Stressโ€“energy tensor | B โˆ’ L | Tau (particle) | Flavour (particle physics) | Quantum number