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
, that is experiments in which particle A scatters off particle B, possibly producing particles
in the process.
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
. The Breit frame is defined as the frame in which
. There are different occasions when Breit frame can be useful, e.g., in measuring the electromagnetic form factor of a hadron,
is the scattered hadron; while for deep inelastic scattering process, the elastically scattered parton should be considered as
. 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.
See also
*
Center-of-momentum frame
In physics, the center-of-momentum frame (also zero-momentum frame or COM frame) of a system is the unique (up to velocity but not origin) inertial frame in which the total momentum of the system vanishes. The ''center of momentum'' of a system is ...
*
Laboratory frame of reference
In theoretical physics, a local reference frame (local frame) refers to a coordinate system or frame of reference that is only expected to function over a small region or a restricted region of space or spacetime.
The term is most often used in t ...
References
Frames of reference
Kinematics
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