In deep inelastic scattering, the reference frame where the exchanged virtual photon has zero energy and spatial momentum magnitude .
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The Breit frame is a specific reference frame used in particle physics, particularly in the context of scattering processes. It is named after physicist G. Breit. In the Breit frame, the total momentum of the particle system is zero. This setup is particularly useful when analyzing the interaction of two particles, such as in collisions or decays. In the Breit frame: 1. The two incoming particles have equal and opposite three-momenta.