Homework 9

Find two good problems relating to electron scattering. You can ask about the formalism if you don’t probe too deeply into the mathematics. You can ask about the results. You can ask about general scattering and about the experimental methods (again not detailed). I may assign these problems to your classmates or use them on the final.

EXAMPLES:

Explain why electrons make such good probes for exploring the proton?

- Sensitive to the charge and spin through electric and magnetic coupling and so should probe the distribution of quarks.
- The electron interaction is governed by QED which is well treated in first order perturbation theory.
- The electron can be produced and accelerated to the interesting energies in the problem and the scattered electron can be readily detected.

Derive the kinematics for elastic scattering of an electron of a few GeV E that scatters from a proton, M, at rest in terms of E, E’, and θ. E is the incident energy. E’ is the scattered energy of the electron. θ is the angle with respect the beam direction of the scattered electron.

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