• Source: 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



A
+
B
→
A
+
∑

C

i




{\displaystyle A+B\rightarrow A+\sum C_{i}}

, that is experiments in which particle A scatters off particle B, possibly producing particles




C

i




{\displaystyle C_{i}}

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



A
+
γ
→

A
′



{\displaystyle A+\gamma \rightarrow A'}

. The Breit frame is defined as the frame in which







p
→




A


+




p
→





A
′



=
0


{\displaystyle {\vec {p}}_{A}+{\vec {p}}_{A'}=0}

. There are different occasions when Breit frame can be useful, e.g., in measuring the electromagnetic form factor of a hadron,



A


{\displaystyle A}

is the scattered hadron; while for deep inelastic scattering process, the elastically scattered parton should be considered as



A


{\displaystyle A}

. 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
Laboratory frame of reference




References

Kata Kunci Pencarian:

• Breit frame
• Gregory Breit
• Center-of-momentum frame
• Local reference frame
• Relativistic Breit–Wigner distribution
• Breit–Wheeler process
• Rabi cycle
• Special relativity
• Lhammas
• John Archibald Wheeler