Question: We observe the elastic scattering of E = 5 GeV electrons from protons [m p = 938 MeV] at the angle = 8 and

We observe the elastic scattering of E = 5 GeV electrons from protons [m_p = 938 MeV] at the angle θ = 8 and we measure their energy.
(1) What is its expected value (neglecting the electron mass)?
(2) What is the scattered electron energy in the CM frame?

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