Give the values that the cross section of e e would have in the absence of resonance at the , the , the and the Z What is the fraction of the angular cross section 90

Question: Give the values that the cross-section of e + e - + - would have in the absence of resonance at the ,

Give the values that the cross-section of e⁺e^-→μ⁺μ^- would have in the absence of resonance at the ρ, the ψ, the ϒ and the Z. What is the fraction of the angular cross section θ > 90°?

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