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.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Fermi constant canonical | 2 |
| Fermi coupling constant | 2 |
| Fermi weak coupling constant | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T748471 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Fermi constant Context triple: [Enrico Fermi, hasEponym, Fermi constant]
-
A.
Planck constant
The Planck constant is a fundamental physical constant that quantifies the relationship between the energy of a photon and the frequency of its associated electromagnetic wave, forming a cornerstone of quantum mechanics.
-
B.
Gell-Mann–Nishijima formula
The Gell-Mann–Nishijima formula is a key relation in particle physics that connects a particle’s electric charge to its isospin and hypercharge, helping classify hadrons within the quark model.
-
C.
Newtonian gravitational constant G
The Newtonian gravitational constant G is the fundamental physical constant that quantifies the strength of gravitational attraction between masses in classical and relativistic theories of gravity.
-
D.
Gell-Mann–Low theorem
The Gell-Mann–Low theorem is a fundamental result in quantum field theory that rigorously connects interacting quantum fields to free fields via the adiabatic switching-on of interactions, underpinning the use of perturbation theory and the Dyson series.
-
E.
Higgs boson
The Higgs boson is an elementary particle in the Standard Model whose associated field gives mass to other fundamental particles, confirming a key mechanism of particle physics.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Fermi constant Target entity description: The Fermi constant is a fundamental physical constant that quantifies the strength of the weak nuclear force in processes such as beta decay.
-
A.
Planck constant
The Planck constant is a fundamental physical constant that quantifies the relationship between the energy of a photon and the frequency of its associated electromagnetic wave, forming a cornerstone of quantum mechanics.
-
B.
Gell-Mann–Nishijima formula
The Gell-Mann–Nishijima formula is a key relation in particle physics that connects a particle’s electric charge to its isospin and hypercharge, helping classify hadrons within the quark model.
-
C.
Newtonian gravitational constant G
The Newtonian gravitational constant G is the fundamental physical constant that quantifies the strength of gravitational attraction between masses in classical and relativistic theories of gravity.
-
D.
Gell-Mann–Low theorem
The Gell-Mann–Low theorem is a fundamental result in quantum field theory that rigorously connects interacting quantum fields to free fields via the adiabatic switching-on of interactions, underpinning the use of perturbation theory and the Dyson series.
-
E.
Higgs boson
The Higgs boson is an elementary particle in the Standard Model whose associated field gives mass to other fundamental particles, confirming a key mechanism of particle physics.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
fundamental constant
ⓘ
physical constant ⓘ weak interaction constant ⓘ |
| alsoKnownAs |
Fermi coupling constant
ⓘ
Fermi weak coupling constant ⓘ
linked to:
Fermi constant
|
| appearsIn |
Fermi’s beta decay Hamiltonian
ⓘ
linked to:
Fermi theory of beta decay
low-energy effective weak interaction Lagrangian ⓘ
linked to:
Fermi theory of beta decay
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 ⓘ
linked to:
Standard Model
calculation of weak interaction cross sections ⓘ electroweak theory ⓘ
linked to:
Salam–Weinberg model
muon decay rate calculations ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Fermi constant Description of subject: The Fermi constant is a fundamental physical constant that quantifies the strength of the weak nuclear force in processes such as beta decay.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Fermi constant
linked to: Fermi constant
linked to: Fermi constant