Hypercharge

Type of particle charge found in the Standard Model Flavour inparticle physics Flavour quantum numbers Isospin: I or I3 Charm: C Strangeness: S Topness: T Bottomness: B′ Related quantum numbers Baryon number: B Lepton number: L Weak isospin: T or T3 Electric charge: Q X-charge: X Combinations Hypercharge: Y Y = (B + S + C + B′ + T) Y = 2 (Q − I3) Weak hypercharge: YW YW = 2 (Q − T3) X + 2YW = 5 (B − L) Flavour mixing CKM matrix PMNS matrix Flavour complementarity vte In particle physics, the hypercharge (a portmanteau of hyperonic and charge) Y of a particle is a quantum number conserved under the strong interaction. The concept of hypercharge provides a single charge operator that accounts for properties of isospin, electric charge, and flavour. The hypercharge is useful to classify hadrons; the similarly named weak hypercharge has an analogous role in the electroweak interaction. Definition Hypercharge is one of two quantum numbers of the SU(3) model of hadrons, alongside isospin I3. The isospin alone was sufficient for two quark flavours — namely u and d — whereas presently 6 flavours of quarks are known. SU(3) weight diagrams (see below) are 2 dimensional, with th