Question: Draw the dominant Feynman diagrams for the reaction e + + e e + e . Estimate the order of magnitude

Draw the dominant Feynman diagrams for the reaction e⁺ + e⁻ → ν_e + ν̅_e. Estimate the order of magnitude and energy dependence of the corresponding contributions to the total cross-section for centreof- mass beam energies m_e << E << M_W, M_Z.

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