Symmetry And Group

The Determination of Absolute-Magnitude Dispersion with by Stromberg G.

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By Stromberg G.

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1 The weak interactions We are now in a position to describe the weak interactions within the Standard Model. 1) MW 2 2G F sin θw 2G F sin2 θw cos2 θw where α is the fine-structure constant. Note, in particular, that in the leading approximation, 2 MW = cos2 θw . 166 × 10−5 GeV−2 . 231 20(15). 1876(21) GeV. 5) One can see that the experimental quantities satisfy the theoretical relations to good accuracy. They are all in agreement at the part in 102 –103 level when radiative corrections are included.

24) In practice, it is necessary to give a more precise definition. We will discuss this when we compute the beta function in the next section. Because of this need to give a precise definition of the renormalized coupling, care is required in comparing theory and experiment. There are, as we will review shortly, a variety of definitions in common use, and it is important to be consistent. Quantities like Green’s functions are not physical, and obey an inhomogeneous equation. One can obtain this equation in a variety of ways.

We take, in the path integral, the gauge-fixing function: 1 G = √ (∂µ Aµ ξ − evπ(x)). 59) The extra term has been judiciously chosen so that when we exponentiate, the Aµ ∂µ π terms in the action cancel. Explicitly, we have: 1 1 L = − Aµ ηµν ∂ 2 − 1 − ∂ µ ∂ ν − (e2 v 2 )ηµν Aν 2 ξ 1 1 ξ 1 + (∂µ σ )2 − m 2σ σ 2 + (∂µ π )2 − (ev)2 π 2 + O(φ 3 ). 61) with M 2 = e2 v 2 , but we have also the field π explicitly in the Lagrangian, and it has propagator: ππ = k2 i . 62) The mass here is just the mass of the vector boson (for other choices of ξ , this is not true).

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