Standard Model

elementary particle transmitting the Higgs field giving particles mass

theory of particle physics based on Yang–Mills theory with gauge group SU(3)×SU(2)×U(1) and spontaneous symmetry breaking

the heaviest of the six known flavors of quarks

massive gauge bosons that mediate the weak nuclear interaction

one third of the difference between the number of quarks and antiquarks in a system

type of elementary particles occurring in the Standard Model

physical phenomenon in which the vacuum expectation value of a field is not invariant under a symmetry of the action, so that a symmetry present at high temperatures is broken at low temperatures

phenomenon in which a neutrino changes lepton flavor as it travels

mechanism in quantum field theory in which spontaneous symmetry breaking causes gauge bosons to acquire mass

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.

quantum number of elementary particles

quantum number relating the electric charge and the third component of weak isospin

why is gravity weaker, compared to other fundamental forces

3×3 unitary matrix relating the mass eigenbasis of the three generations of quarks to the basis under which the weak interactions diagonalize

Classification scheme of hadrons

3×3 unitary mixing matrix that relates the flavor basis of the neutrinos to the mass eigenbasis

effect or phenomenon that is not invariant under a presumed or approximate symmetry of a physical system

quantum field-theoretic differences of magnetic properties than expected from classical theories

interaction in particle physics

preprint

expectation value of a local operator at a vacuum of a quantum field theory, whose nonzero value may effect the Higgs mechanism

In particle physics, G-parity is a multiplicative quantum number that results from the generalization of C-parity to multiplets of particles.

nuclear physics process that has not been observed yet

term in particle physics

quantum mechanical transmutation of neutral particles

mechanism in the standard model through which flavour-changing neutral currents are suppressed in loop diagrams

interactions between elementary particles that change a particle’s flavor without changing its electric charge