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Bill_K

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I don't fully understand the reasoning, but this paper gives the ratio as σ_{W}/σ_{Z} ≈ 3.33, and this book derives (Eq. 85) the ratio as

σ_{W}/σ_{Z} ~ |V_{qq'}|^{2}/(v_{q}^{2} + a_{q}^{2})

where V_{qq'} ≈ 0.97 is the CKM matrix element and a_{q} = 1/2 and v_{q} ≈ -0.3 are the neutral current vector and axial vector couplings.

Which works out about right.

σ

where V

Which works out about right.

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