K_S^0
E543036
K_S^0 is the short-lived neutral kaon, a subatomic meson that participates in weak interactions and exhibits CP-violating behavior.
All labels observed (1)
| Label | Occurrences |
|---|---|
| K_S^0 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5766865 — 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: K_S^0 Context triple: [K-short, hasAlternativeName, K_S^0]
-
A.
KS
KS is the standard two-letter postal abbreviation for the U.S. state of Kansas.
-
B.
KSL
KSL is the primary sign language used by the Deaf community in South Korea, with its own distinct grammar and vocabulary separate from spoken Korean.
-
C.
KSS
KSS is the abbreviated name of the Kaohsiung 17LIVE Steelers, a professional basketball team based in Kaohsiung, Taiwan.
-
D.
KCS
KCS is the commonly used abbreviation for Knox County Schools, a public school district serving Knox County, Tennessee.
-
E.
KO
KO is the New York Stock Exchange ticker symbol for The Coca-Cola Company, one of the world’s largest and most recognizable beverage corporations.
- 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: K_S^0 Target entity description: K_S^0 is the short-lived neutral kaon, a subatomic meson that participates in weak interactions and exhibits CP-violating behavior.
-
A.
KS
KS is the standard two-letter postal abbreviation for the U.S. state of Kansas.
-
B.
KSL
KSL is the primary sign language used by the Deaf community in South Korea, with its own distinct grammar and vocabulary separate from spoken Korean.
-
C.
KSS
KSS is the abbreviated name of the Kaohsiung 17LIVE Steelers, a professional basketball team based in Kaohsiung, Taiwan.
-
D.
KCS
KCS is the commonly used abbreviation for Knox County Schools, a public school district serving Knox County, Tennessee.
-
E.
KO
KO is the New York Stock Exchange ticker symbol for The Coca-Cola Company, one of the world’s largest and most recognizable beverage corporations.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
meson
ⓘ
neutral kaon ⓘ |
| belongsToFamily |
kaon
ⓘ
strange meson ⓘ |
| decaysViaInteraction | weak interaction ⓘ |
| differsFrom | K_L^0 in lifetime and CP properties ⓘ |
| dominantDecayMode |
π^+ π^-
ⓘ
π^0 π^0 ⓘ |
| exhibitsPhenomenon | CP violation ⓘ |
| hasAntiparticle | itself (self-conjugate state in good approximation) ⓘ |
| hasBaryonNumber | 0 ⓘ |
| hasBranchingFractionToπ+π- | about 69% (approximate) ⓘ |
| hasBranchingFractionToπ0π0 | about 31% (approximate) ⓘ |
| hasElectricCharge | 0 ⓘ |
| hasIsospin | 1/2 ⓘ |
| hasMass | about 497.6 MeV/c^2 ⓘ |
| hasMeanLifetime |
about 89.5 picoseconds
ⓘ
approximately 0.895×10^-10 s ⓘ |
| hasParity | -1 ⓘ |
| hasQuantumNumber |
C = not well-defined for open-flavor meson
ⓘ
G = not applicable ⓘ |
| hasQuarkContent | d s̄ + s d̄ (quantum superposition) ⓘ |
| hasQuarkFlavor |
down
ⓘ
strange ⓘ |
| hasRestFrameDecayLength | about 2.68 cm ⓘ |
| hasSpin | 0 ⓘ |
| hasStrangeness | +1 ⓘ |
| hasTotalAngularMomentumJ | 0 ⓘ |
| isAlsoCalled |
K-short
ⓘ
K_S ⓘ short-lived neutral kaon ⓘ |
| isCPApproximateEigenstate | CP = +1 ⓘ |
| isDescribedBy | neutral kaon mixing formalism ⓘ |
| isEigenstateOf | effective weak Hamiltonian in K^0–K̄^0 system ⓘ |
| isObservedIn |
collider experiments
ⓘ
kaon beam experiments ⓘ |
| isProducedIn | strong interactions involving strange quark production ⓘ |
| isQuantumSuperpositionOf |
K^0
ⓘ
K̄^0 ⓘ |
| isShortLivedPartnerOf | K_L^0 ⓘ |
| isUsedToTest |
CP symmetry
ⓘ
CPT symmetry ⓘ Standard Model flavor physics ⓘ |
| participatesInInteraction |
electromagnetic interaction
ⓘ
strong interaction ⓘ weak interaction ⓘ |
| undergoes | K^0–K̄^0 oscillations ⓘ |
| wasCrucialForDiscoveryOf | CP violation in neutral kaons ⓘ |
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: K_S^0 Description of subject: K_S^0 is the short-lived neutral kaon, a subatomic meson that participates in weak interactions and exhibits CP-violating behavior.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.