physics and particle physics, isospin (I) is a quantum number related to the up- and down quark content of the particle. Isospin is also known as isobaric...

with zero weak isospin do not. Weak isospin is a construct parallel to the idea of isospin under the strong interaction. Weak isospin is usually given...

interaction, weak isospin is conserved: The sum of the weak isospin numbers of the particles entering the interaction equals the sum of the weak isospin numbers...

quarks. Under the isospin model, they were considered to be a single particle in different charged states. The mathematics of isospin was modeled after...

particle, but in different isospin states. The mathematics of isospin was modeled after the mathematics of spin. Isospin projections varied in increments...

In particle physics, isospin multiplets are families of hadrons with approximately equal masses. All particles within a multiplet, have the same spin...

level of the whole atom. Analogously, the five flavour quantum numbers (isospin, strangeness, charm, bottomness or topness) can characterize the quantum...

symmetry relating the proton and neutron is known as isospin and denoted I (or sometimes T). Isospin is an SU(2) symmetry, like ordinary spin, so is completely...

without changing the dynamics of the system. These fields are the weak isospin fields W1, W2, and W3, and the weak hypercharge field B. This invariance...

hypercharge provides a single charge operator that accounts for properties of isospin, electric charge, and flavour. The hypercharge is useful to classify hadrons;...

quantum number relating the electric charge and the third component of weak isospin. It is frequently denoted Y W {\displaystyle Y_{\mathsf {W}}} and corresponds...

strong interactions, isospin symmetry remains a useful calculational tool, and its violation introduces corrections to the isospin-symmetric results. Because...

representation (T = ⁠ 1 /2⁠) of the weak isospin SU(2) gauge symmetry. This means that these particles are eigenstates of the isospin projection T3 with eigenvalues...

as two states of the same nucleon, and together form an isospin doublet (I = ⁠1/2⁠). In isospin space, neutrons can be transformed into protons and conversely...

not only electric charge, but also charges such as color charge and weak isospin. Because of a phenomenon known as color confinement, a hadron cannot have...

flavor symmetry. This classification scheme organized the hadrons into isospin multiplets, but the physical basis behind it was still unclear. In 1964...

particular, since χ ∈ L has weak isospin ⁠1/2⁠ like the Higgs field H, and η {\displaystyle \eta } has weak isospin 0, the mass parameter M can be generated...

quarks each. The isospin analogy also applies to quarks, and is the source of the names up (as in "isospin up") and down (as in "isospin down") for the...

particle, but with different isospin quantum numbers; conventionally, the proton is isospin up, while the neutron is isospin down. The strong force is invariant...

called an isospin singlet, mathematically analogous to how a spin-0 particle behaves under ordinary rotation. In general, particles form isospin multiplets...

under the SU(2) group of isospin. An isovector state is a triplet state with total isospin 1, with the third component of isospin either 1, 0, or -1, much...

leptons involved, following the convention in use for the sign of weak isospin and the sign of strangeness quantum number (for quarks), both of which...

SU(3) flavor symmetry. This ordered hadrons into isospin multiplets. The physical basis behind both isospin and strangeness was only explained in 1964, when...

the masses of hadrons within a specific multiplet, determined by their isospin (I) and strangeness (or alternatively, hypercharge) M = a 0 + a 1 Y + a...

field under the SU(2) group of isospin. Isoscalars are a singlet state, with total isospin 0 and the third component of isospin 0, much like a singlet state...

particle physics, a rho meson is a short-lived hadronic particle that is an isospin triplet whose three states are denoted as ρ+ , ρ0 and ρ− . Along with pions...

distinguished from neutrinos by having opposite-signed lepton number and weak isospin, and right-handed instead of left-handed chirality. To conserve total lepton...

component of the isospin "vector". G-parity is a combination of charge conjugation and a π rad (180°) rotation around the 2nd axis of isospin space. Given...

the right-handed down-type quark color triplet and a left-handed lepton isospin doublet, while the 10 contains the six up-type quark components, the left-handed...

The Δ baryons have a mass of about 1232 MeV/c2; their third component of isospin I 3 = ± 1 2   o r   ± 3 2 ; {\displaystyle \;I_{3}=\pm {\tfrac {1}{2}}~{\mathsf...