Relation With Chirality
Fermions with negative chirality (also called left-handed fermions) have T = 1⁄2 and can be grouped into doublets with T3 = ±1⁄2 that behave the same way under the weak interaction. For example, up-type quarks (u, c, t) have T3 = +1⁄2 and always transform into down-type quarks (d, s, b), which have T3 = −1⁄2, and vice-versa. On the other hand, a quark never decays weakly into a quark of the same T3. Something similar happens with left-handed leptons, which exist as doublets containing a charged lepton (e−, μ−, τ−) with T3 = −1⁄2 and a neutrino (ν
e, ν
μ, ν
τ) with T3 = 1⁄2.
Fermions with positive chirality (also called right-handed fermions) have T = 0 and form singlets that do not undergo weak interactions.
Electric charge, Q, is related to weak isospin, T3, and weak hypercharge, YW, by
Read more about this topic: Weak Isospin
Famous quotes containing the words relation with and/or relation:
“To criticize is to appreciate, to appropriate, to take intellectual possession, to establish in fine a relation with the criticized thing and to make it one’s own.”
—Henry James (1843–1916)
“Among the most valuable but least appreciated experiences parenthood can provide are the opportunities it offers for exploring, reliving, and resolving one’s own childhood problems in the context of one’s relation to one’s child.”
—Bruno Bettelheim (20th century)