GIM mechanism

E120376

mechanism in the Standard Model theoretical framework in particle physics

The GIM mechanism is a theoretical framework in particle physics that explains the suppression of flavor-changing neutral currents by introducing quark mixing and predicting the existence of the charm quark.

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All labels observed (2)

Label	Occurrences
Glashow–Iliopoulos–Maiani mechanism	2
GIM mechanism canonical	1

How this entity was disambiguated

This entity first appeared as the object of triple T1059908 — 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: GIM mechanism
Context triple: [Sheldon Glashow, knownFor, GIM mechanism]

A. Higgs mechanism
The Higgs mechanism is a process in particle physics that explains how fundamental particles acquire mass through their interaction with the Higgs field.
B. Salam–Weinberg model
The Salam–Weinberg model is the electroweak theory that unifies the electromagnetic and weak nuclear forces within the Standard Model of particle physics.
C. 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.
D. Higgs field
The Higgs field is a fundamental quantum field permeating all of space whose interactions with particles give them mass via the Higgs mechanism.
E. 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.
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: GIM mechanism
Target entity description: The GIM mechanism is a theoretical framework in particle physics that explains the suppression of flavor-changing neutral currents by introducing quark mixing and predicting the existence of the charm quark.

A. Higgs mechanism
The Higgs mechanism is a process in particle physics that explains how fundamental particles acquire mass through their interaction with the Higgs field.
B. Salam–Weinberg model
The Salam–Weinberg model is the electroweak theory that unifies the electromagnetic and weak nuclear forces within the Standard Model of particle physics.
C. 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.
D. Higgs field
The Higgs field is a fundamental quantum field permeating all of space whose interactions with particles give them mass via the Higgs mechanism.
E. 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.
F. None of above. chosen

Statements (41)

Predicate	Object
instanceOf	mechanism in the Standard Model ⓘ theoretical framework in particle physics ⓘ
abbreviationOf	GIM mechanism self-linksurface differs ⓘ surface form: Glashow–Iliopoulos–Maiani mechanism
addresses	absence of large strangeness-changing neutral currents ⓘ smallness of rare kaon decay rates ⓘ
appliesTo	weak charged currents ⓘ weak neutral currents ⓘ
compatibleWith	gauge invariance of the Standard Model ⓘ renormalizability of the Standard Model ⓘ
constrains	models of new physics beyond the Standard Model ⓘ
describes	cancellation of flavor-changing neutral currents at tree level ⓘ quark mixing ⓘ
explains	suppression of flavor-changing neutral currents ⓘ
field	flavor physics ⓘ particle physics ⓘ
generalizedTo	three-generation CKM framework ⓘ
historicalRole	provided theoretical motivation for the charm quark before its discovery ⓘ
implies	loop-level flavor-changing neutral currents are highly suppressed ⓘ
influences	structure of flavor physics phenomenology ⓘ
inspired	later developments in flavor physics and CP violation studies ⓘ
inStandardModelSector	electroweak interaction ⓘ
involves	cancellation between contributions of different quark flavors ⓘ unitarity of the quark mixing matrix ⓘ
mainConcept	suppression of flavor-changing neutral currents ⓘ
mathematicalFormulationUses	unitary 2×2 quark mixing matrix for two generations ⓘ
namedAfter	John Iliopoulos ⓘ Luciano Maiani ⓘ Sheldon Glashow ⓘ
predicts	existence of the charm quark ⓘ
prevents	tree-level flavor-changing neutral currents in the Standard Model ⓘ
publishedIn	Physical Review D ⓘ
relatedTo	Cabibbo–Kobayashi–Maskawa matrix ⓘ surface form: CKM matrix Cabibbo–Kobayashi–Maskawa matrix ⓘ surface form: Cabibbo angle charm quark discovery in 1974 ⓘ
requires	at least two generations of quarks ⓘ unitary quark mixing matrix ⓘ
testedBy	kaon decay experiments ⓘ neutral kaon mixing measurements ⓘ rare meson decay searches ⓘ
typeOfSuppression	flavor-changing neutral current suppression by destructive interference ⓘ
yearProposed	1970 ⓘ

How these facts were elicited

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

Sheldon Glashow → notableWork → GIM mechanism ⓘ

this entity surface form: Glashow–Iliopoulos–Maiani mechanism

Sheldon Glashow → knownFor → GIM mechanism ⓘ

GIM mechanism → abbreviationOf → GIM mechanism self-linksurface differs ⓘ