Английская Википедия:Breit frame
In particle physics, the Breit frame (also known as infinite-momentum frame or IMF) is a frame of reference used to describe scattering experiments of the form <math>A + B \rightarrow A + \sum C_i</math>, that is experiments in which particle A scatters off particle B, possibly producing particles <math>C_i</math> in the process.[1] The frame is defined so that the particle A has its momentum reversed in the scattering process.
Another way of understanding the Breit frame is to look at the elastic scattering <math>A+\gamma \rightarrow A'</math>. The Breit frame is defined as the frame in which <math>\vec{p}_A+\vec{p}_{A'}=0</math>. There are different occasions when Breit frame can be useful, e.g., in measuring the electromagnetic form factor of a hadron, <math>A</math> is the scattered hadron; while for deep inelastic scattering process, the elastically scattered parton should be considered as <math>A</math>. It is only in the latter case the Breit frame gets related to infinite-momentum frame.
It is named after the American physicist Gregory Breit.[2]
See also
References
Шаблон:Classicalmechanics-stub
