Forest VirtualRealPhoton

Polarized Virtual Photons From Electrons

Virtual Photon Polarization

[math]\epsilon= \left [ 1 + 2 \left ( 1 + \frac{\nu^2}{Q^2}\right ) \tan^2\left( \frac{\theta_e^{\prime}}{2}\right)\right ][/math]

Longitudinal Photon Polarization

[math]\epsilon_L= \frac{Q^2}{\nu^2}\epsilon[/math]

Polarization Density Matrix

Reference: N. Dombey, Rev. Mod. Phys., 41, 236 (1969)

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