Fermi constant
E88966
The Fermi constant is a fundamental physical constant that quantifies the strength of the weak nuclear force in processes such as beta decay.
Aliases (2)
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
fundamental constant
→
physical constant → weak interaction constant → |
| alsoKnownAs |
Fermi coupling constant
→
Fermi weak coupling constant → |
| appearsIn |
Fermi’s beta decay Hamiltonian
→
low-energy effective weak interaction Lagrangian → weak charged-current interactions → |
| definedInContextOf |
four-fermion contact interaction
→
|
| describes |
strength of the weak nuclear force
→
|
| determinedFrom |
muon lifetime measurements
→
|
| energyScaleImplication |
corresponds to weak scale around 300 GeV
→
|
| fieldOfStudy |
electroweak interaction
→
nuclear physics → particle physics → |
| governs |
rate of beta decay
→
rate of muon decay → |
| hasApproximateValue |
1.1663787×10^{-5} GeV^{-2}
→
|
| hasApproximateValueUncertainty |
6×10^{-12} GeV^{-2}
→
|
| hasCODATAValueYear |
2018
→
|
| hasDimension |
(energy)^{-2}
→
(mass)^{-2} → |
| hasPhysicalMeaning |
probability amplitude per unit time and volume for weak processes
→
|
| hasSIUnit |
GeV^{-2}
→
J^{-2}·m^{3}·s^{-1} → |
| inNaturalUnits |
G_F ≈ 1.166×10^{-5} GeV^{-2}
→
|
| introducedBy |
Enrico Fermi
→
|
| is |
effective coupling constant at low energies for weak interaction
→
|
| isLowEnergyLimitOf |
W boson exchange interaction
→
|
| isPositive |
true
→
|
| relatedConstant |
Planck constant
→
elementary charge → fine-structure constant → speed of light → |
| relatedTo |
Higgs vacuum expectation value
→
W boson mass → beta decay → four-fermion interaction → weak interaction → weak mixing angle → |
| roleInStandardModel |
sets overall scale of weak interaction strength
→
|
| symbol |
G_F
→
|
| usedAsInputParameterIn |
precision electroweak fits
→
|
| usedIn |
Fermi theory of beta decay
→
Standard Model of particle physics → calculation of weak interaction cross sections → electroweak theory → muon decay rate calculations → |
Referenced by (4)
| Subject (surface form when different) | Predicate |
|---|---|
|
Fermi constant
("Fermi weak coupling constant")
→
|
alsoKnownAs |
|
Enrico Fermi
→
|
hasEponym |
|
Fermi theory of beta decay
("Fermi coupling constant")
→
|
introducesConcept |
|
Fermi theory of beta decay
→
|
relatedTo |