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Flavour (particle physics)
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<table><tbody><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td colspan="3">Six flavours of leptons</td></tr></tbody></table> <p>In <a href="/facts/Particle_physics/YgIuyj2t">particle physics</a>, flavour or flavor refers to the <i>species</i> of an <a href="/facts/Elementary_particle/CTFDM97U">elementary particle</a>. The <a href="/facts/Standard_Model/LhVGf9ow">Standard Model</a> counts six flavours of <a href="/facts/Quark/hwuuVkV5">quarks</a> and six flavours of <a href="/facts/Lepton/X4a6MGop">leptons</a>. They are conventionally parameterized with <i>flavour <a href="/facts/Quantum_number/AByP6F0y">quantum numbers</a></i> that are assigned to all <a href="/facts/Subatomic_particle/tMEzcTWQ">subatomic particles</a>. They can also be described by some of the <a href="/facts/Family_symmetries/0swLGX6R">family symmetries</a> proposed for the quark-lepton generations. </p>