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In nuclear physics and particle physics, the weak interaction, also called the weak force, is one of the four known fundamental interactions, with the others being electromagnetism, the strong interaction, and gravitation.
The Standard Model (SM) is a gauge theory, based on the symmetry group SU(3)C ⊗SU(2)L ⊗U(1)Y, which describes strong, weak and electromagnetic interactions, via the exchange of the corresponding spin–1 gauge fields: 8 massless gluons and 1 massless photon f or the strong and electromagnetic inter-
In particle physics, the electroweak interaction or electroweak force is the unified description of two of the four known fundamental interactions of nature: electromagnetism (electromagnetic interaction) and the weak interaction.
The Weak Interaction. The weak interaction accounts for many decays in particle physics, e.g. μ. − → − e ̄νe νμ. − τ − → e ̄νe ντ π. + → − μ ̄νμ n → − pe ̄νe. Characterised by long lifetimes and small interaction cross-sections.
Table 1 summarizes our present knowledge, and the following remarks can be made. All interactions are produced by the exchange of virtual quanta. For the strong, electromagnetic, and weak interactions they are vector (spin-one) elds, whereas the graviton is assumed to be a tensor, spin-two eld.
a brief summary of the phenomenology of the electromagnetic and the weak interactions; gauge theories, Abelian and non-Abelian; spontaneous symmetry breaking; the step-by-step construction of the Standard Model; the Standard Model and experiment. It is only in the last part that the notes differ from the actual lectures, because I took into account
These lectures on electroweak (EW) interactions start with a short summary of the Glashow{Weinberg{Salam theory and then cover in detail some main subjects of present interest in phenomenology. The modern EW theory inherits the phenomenological successes of the (V− A) ⊗ (V − A) four-fermion low-energy description of weak interactions,
