Question: Evaluate R (e + e - hadrons) /(e + e - + - ) At and at Vs = 2.5

Evaluate R ≡ σ(e+ e- → hadrons) /σ(e+ e- → μ+ μ-)

At

 Vs = 2.5 GeV


and at

 Vs = 4 GeV.

Vs = 2.5 GeV Vs = 4 GeV.

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