Consider the processes (1) e + + e - + + - and (2)

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Consider the processes (1) e+ + e- → μ+ + μ- and (2) e+ + e- → hadrons at the two centre of mass energies √s = 2 GeV and √s = 20 GeV. Calculate the ratio of the cross-section of process (1) at the two energies. Calculate (approximately) the ratios of the cross-sections of the two processes at each of the two energies. What is the ratio of the cross section of process (2) at the two energies?

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