neutral kaon mixing
E543038
Neutral kaon mixing is a quantum phenomenon in which the neutral kaon and its antiparticle oscillate between each other, leading to distinct short- and long-lived states and providing a key system for studying CP violation in particle physics.
All labels observed (2)
| Label | Occurrences |
|---|---|
| KL (long-lived neutral kaon) | 1 |
| neutral kaon mixing canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5766897 — 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: neutral kaon mixing Context triple: [K-short, playsRoleIn, neutral kaon mixing]
-
A.
Cabibbo–Kobayashi–Maskawa matrix
The Cabibbo–Kobayashi–Maskawa matrix is a fundamental component of the Standard Model of particle physics that describes how quarks change flavor via the weak interaction and accounts for CP violation in the quark sector.
-
B.
K+ (charged kaon)
K⁺ (charged kaon) is a positively charged meson containing an up quark and an anti-strange quark, notable for its role in probing weak interactions and testing the Standard Model through rare decay processes.
-
C.
neutrino oscillation
Neutrino oscillation is a quantum phenomenon in which neutrinos change from one flavor type to another as they travel, implying that they have mass and mix between flavor states.
-
D.
Kobayashi–Maskawa theory
The Kobayashi–Maskawa theory is a fundamental framework in particle physics that explains CP violation in the Standard Model through a three-generation quark mixing matrix (the CKM matrix).
-
E.
Neutrino
A neutrino is an extremely light, electrically neutral elementary particle that interacts only via the weak nuclear force and gravity, making it very difficult to detect.
- 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: neutral kaon mixing Target entity description: Neutral kaon mixing is a quantum phenomenon in which the neutral kaon and its antiparticle oscillate between each other, leading to distinct short- and long-lived states and providing a key system for studying CP violation in particle physics.
-
A.
Cabibbo–Kobayashi–Maskawa matrix
The Cabibbo–Kobayashi–Maskawa matrix is a fundamental component of the Standard Model of particle physics that describes how quarks change flavor via the weak interaction and accounts for CP violation in the quark sector.
-
B.
K+ (charged kaon)
K⁺ (charged kaon) is a positively charged meson containing an up quark and an anti-strange quark, notable for its role in probing weak interactions and testing the Standard Model through rare decay processes.
-
C.
neutrino oscillation
Neutrino oscillation is a quantum phenomenon in which neutrinos change from one flavor type to another as they travel, implying that they have mass and mix between flavor states.
-
D.
Kobayashi–Maskawa theory
The Kobayashi–Maskawa theory is a fundamental framework in particle physics that explains CP violation in the Standard Model through a three-generation quark mixing matrix (the CKM matrix).
-
E.
Neutrino
A neutrino is an extremely light, electrically neutral elementary particle that interacts only via the weak nuclear force and gravity, making it very difficult to detect.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
CP violation system
ⓘ
flavor oscillation ⓘ meson–antimeson mixing ⓘ quantum phenomenon ⓘ |
| characterizedBy |
CP-violating parameter epsilon
ⓘ
lifetime difference between KS and KL ⓘ mass difference between KS and KL ⓘ off-diagonal elements of mass matrix ⓘ |
| describedBy | effective 2x2 Hamiltonian ⓘ |
| exhibits |
CP violation
ⓘ
CPT invariance (to experimental precision) ⓘ T violation ⓘ indirect CP violation ⓘ |
| firstObservedIn | 1950s ⓘ |
| framework |
Standard Model of particle physics
ⓘ
linked to:
Standard Model
|
| governingInteraction | weak interaction ⓘ |
| hasCPViolatingParameterEpsilonMagnitude | about 2.2 x 10^-3 ⓘ |
| hasDecayWidthDifference | ΔΓ between KS and KL ⓘ |
| hasLongLivedStateLifetime | about 5.1 x 10^-8 s ⓘ |
| hasMassDifferenceDeltaM | about 3.5 x 10^-6 eV ⓘ |
| hasOscillationFrequency | proportional to mass difference Δm ⓘ |
| hasShortLivedStateLifetime | about 0.9 x 10^-10 s ⓘ |
| importantFor |
constraining Standard Model parameters
ⓘ
searches for physics beyond the Standard Model ⓘ testing CKM matrix ⓘ |
| involvesParticle |
K0
ⓘ
anti-K0 ⓘ |
| involvesQuarkContent |
down anti-strange
ⓘ
strange anti-down ⓘ |
| keyExperiment | Cronin–Fitch CP violation experiment ⓘ |
| leadsTo |
K-long state
ⓘ
K-short state ⓘ |
| ledTo | discovery of CP violation in 1964 ⓘ |
| occursIn | neutral K-meson system ⓘ |
| producesFlavorEigenstates |
K0
ⓘ
anti-K0 ⓘ |
| producesMassEigenstates |
KL
ⓘ
KS ⓘ |
| relatedProcess |
B0–anti-B0 mixing
ⓘ
Bs0–anti-Bs0 mixing ⓘ D0–anti-D0 mixing ⓘ |
| sensitiveTo |
box diagrams with W bosons
ⓘ
top-quark contributions ⓘ virtual up-type quarks ⓘ |
| studiedIn |
flavor physics
ⓘ
kaon factories ⓘ |
| timeEvolutionDescribedBy | Schrödinger-like equation for two-state system ⓘ |
| usedToTest |
CPT symmetry
ⓘ
unitarity of CKM matrix ⓘ |
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: neutral kaon mixing Description of subject: Neutral kaon mixing is a quantum phenomenon in which the neutral kaon and its antiparticle oscillate between each other, leading to distinct short- and long-lived states and providing a key system for studying CP violation in particle physics.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: neutral kaon mixing