Consider the neutrino cross-section on an electron and on an average nucleon (namely the average between the

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Consider the neutrino cross-section on an electron 

o(v,e Vue)  


and on an ‘average nucleon’ (namely the average between the cross-sections on protons and neutrons) 

→µh) z 0.2 ×


at energies √s >> m, where m is the target mass and h is any hadronic state (the factor 0.2 is due to the quark distribution inside the nucleus). Calculate their ratio at Ev = 50 GeV. How does this ratio depend on energy? Calculate σ/Ev for the two reactions.

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