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Fermi interaction
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)
Physics
Branch of physics
Quantum field theory
Effective field theory
Four-fermion interaction
2026-10-03
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The Fermi interaction is the low-
energy
four-
fermion
approximation
to the
weak charged current
. Integrating out
a
W boson
gives its
coefficient
G
F
/
2
=
g
2
/
(
8
M
W
2
)
at
tree
level.
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(6)
Four-fermion interaction
Effective field theory
Quantum field theory
Branch of physics
Physics
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Past exam of the mathematics course of the University of Cambridge
/
2019
/
iii
/
Paper 305
/
3
/
b
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2019
/
iii
/
Paper 305
/
3
/
d
/
Solution
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