Calculate the cross-sections of the processes e + e - + - and e +

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Calculate the cross-sections of the processes e+e- →μ+μ- and e+e- → hadrons at the J/ψ peak (mψ = 3.097 GeV) and for the ratio of the former to its value in the absence of resonance. Neglect the masses and use the Breit–Wigner approximation [Γe/Γ = 5.9%, Γh/Γ = 87.7%].

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