V_us
E815589
V_us is the Cabibbo–Kobayashi–Maskawa (CKM) matrix element that quantifies the strength of quark flavor-changing transitions between up and strange quarks in the Standard Model of particle physics.
All labels observed (1)
| Label | Occurrences |
|---|---|
| V_us canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9689289 — 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: V_us Context triple: [Cabibbo–Kobayashi–Maskawa matrix, hasElement, V_us]
-
A.
VU
VU is a major research university in Amsterdam, Netherlands, known for its wide range of academic programs and emphasis on interdisciplinary and socially engaged scholarship.
-
B.
VES
VES is an abbreviation for the Virtual Execution System, a runtime environment designed to execute managed code in a platform-independent manner.
-
C.
Vin
Vin is a common shortened form of the given name Vincent, often used as an informal or familiar nickname.
-
D.
VS
VS is the two-letter abbreviation commonly used for the Swiss canton of Valais.
-
E.
VAN
VAN is the standard abbreviation used for the Vancouver Canadians, a Minor League Baseball team based in Vancouver, British Columbia.
- 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: V_us Target entity description: V_us is the Cabibbo–Kobayashi–Maskawa (CKM) matrix element that quantifies the strength of quark flavor-changing transitions between up and strange quarks in the Standard Model of particle physics.
-
A.
VU
VU is a major research university in Amsterdam, Netherlands, known for its wide range of academic programs and emphasis on interdisciplinary and socially engaged scholarship.
-
B.
VES
VES is an abbreviation for the Virtual Execution System, a runtime environment designed to execute managed code in a platform-independent manner.
-
C.
Vin
Vin is a common shortened form of the given name Vincent, often used as an informal or familiar nickname.
-
D.
VS
VS is the two-letter abbreviation commonly used for the Swiss canton of Valais.
-
E.
VAN
VAN is the standard abbreviation used for the Vancouver Canadians, a Minor League Baseball team based in Vancouver, British Columbia.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
CKM matrix element
ⓘ
complex number ⓘ |
| appearsIn | W boson couplings to up and strange quarks ⓘ |
| approximatelyEquals |
Wolfenstein parameter λ
ⓘ
linked to:
Wolfenstein parameterization
sin(Cabibbo angle) ⓘ |
| belongsToTheory | quark mixing in weak interactions ⓘ |
| constrainedBy |
experimental measurements of kaon decays
ⓘ
lattice QCD calculations of hadronic matrix elements ⓘ |
| dependsOn | renormalization scheme for quark fields ⓘ |
| describes | quark flavor-changing transitions between up and strange quarks ⓘ |
| generalizedFrom | Cabibbo mixing between d and s quarks ⓘ |
| governs |
strength of s → u transitions
ⓘ
strength of u → s transitions ⓘ |
| hasApproximateMagnitude |
0.224
ⓘ
0.225 ⓘ |
| hasPhaseConvention | standard CKM phase convention ⓘ |
| hasPhysicalMeaning | probability amplitude for W-mediated u–s transitions ⓘ |
| hasRole | parameter in weak charged-current interactions ⓘ |
| hasUncertaintySource |
experimental systematics in kaon decays
ⓘ
theoretical uncertainties in form factors ⓘ |
| introducedInContextOf |
Cabibbo theory of weak interactions
ⓘ
linked to:
Cabibbo theory
|
| isConstrainedBy |
unitarity of first row of CKM matrix
ⓘ
unitarity of second column of CKM matrix ⓘ |
| isElementOf |
first row of CKM matrix
ⓘ
second column of CKM matrix ⓘ |
| isInputTo |
global CKM fits
ⓘ
global electroweak precision fits ⓘ |
| parameterization |
Wolfenstein parameter λ
ⓘ
linked to:
Wolfenstein parameterization
|
| partOf |
Cabibbo–Kobayashi–Maskawa matrix
ⓘ
Standard Model of particle physics ⓘ
linked to:
Standard Model
|
| relatedByUnitarityTo |
V_cs
ⓘ
V_tb ⓘ V_ts ⓘ V_ub ⓘ V_ud ⓘ |
| relatedTo |
Cabibbo angle
ⓘ
linked to:
Cabibbo theory
|
| relatesQuarkFlavors |
strange quark
ⓘ
up quark ⓘ |
| satisfies |
CKM unitarity relations
ⓘ
linked to:
unitarity triangle
|
| symbolFor | |V_us| ⓘ |
| usedIn |
CKM unitarity tests
ⓘ
determination of Fermi constant consistency checks ⓘ hyperon decay analyses ⓘ kaon leptonic decay analyses ⓘ kaon semileptonic decay analyses ⓘ tau lepton decay analyses ⓘ |
| usedToProbe | possible physics beyond the Standard Model ⓘ |
| usedToTest | lepton flavor universality in kaon decays ⓘ |
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: V_us Description of subject: V_us is the Cabibbo–Kobayashi–Maskawa (CKM) matrix element that quantifies the strength of quark flavor-changing transitions between up and strange quarks in the Standard Model of particle physics.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.