Consider the NC scattering of on the valence quarks of a nucleus. Write down the

Consider the NC scattering of ν_μ on the valence quarks of a nucleus. Write down the Z-charge factors squared of the quarks and their values, assuming sin²θ_W = 0.23. The total ν_μ cross-section is proportional to a combination of the Z-charge factors squared of the quarks. Write it and evaluate it for the valence quarks and for a nucleus containing the same number of u and d quarks.