V_cb
E815591
V_cb is the CKM matrix element that quantifies the strength of quark flavor-changing transitions between charm and bottom quarks in the Standard Model of particle physics.
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
CKM matrix element
ⓘ
complex number ⓘ |
| affects |
predictions for B meson lifetimes and branching ratios
ⓘ
rates of rare B decays via normalization of b → c transitions ⓘ |
| appearsIn |
W boson couplings to quarks
ⓘ
charged-current weak interactions ⓘ |
| approximatelyEquals | A λ² in Wolfenstein parametrization ⓘ |
| constrainedBy | unitarity of the CKM matrix ⓘ |
| constrains | models of new physics affecting b → c transitions ⓘ |
| contributesTo | determination of CKM unitarity triangle ⓘ |
| dependsOn | hadronic form factors ⓘ |
| describes | quark flavor-changing transitions between charm and bottom quarks ⓘ |
| dimension | dimensionless ⓘ |
| expressedIn | Wolfenstein parametrization of the CKM matrix NERFINISHED ⓘ |
| governs |
b → c transitions
ⓘ
b̄ → c̄ transitions ⓘ |
| hasApproximateMagnitude |
0.04
ⓘ
|V_cb| ≈ 4 × 10⁻² ⓘ |
| hasPhaseConvention | can be chosen approximately real in standard CKM phase convention ⓘ |
| hasRole | input parameter in precision flavor physics ⓘ |
| hasUncertaintySource |
experimental systematics
ⓘ
theoretical form-factor calculations ⓘ |
| hierarchyProperty |
|V_cb| ≪ |V_cs| and |V_cb| ≪ |V_tb|
ⓘ
|V_cb| ≫ |V_ub| ⓘ |
| isSubjectOf |
heavy quark effective theory analyses
ⓘ
inclusive–exclusive determination tension studies ⓘ lattice QCD calculations ⓘ |
| matrixPosition | row corresponding to charm quark, column corresponding to bottom quark ⓘ |
| measuredIn |
exclusive B → D ℓ ν decays
ⓘ
exclusive B → D* ℓ ν decays ⓘ inclusive b → c ℓ ν decays ⓘ semileptonic B meson decays ⓘ |
| namedAfter |
Cabibbo
NERFINISHED
ⓘ
Kobayashi NERFINISHED ⓘ Maskawa NERFINISHED ⓘ |
| parameterOf | weak interaction Lagrangian ⓘ |
| partOf |
Cabibbo–Kobayashi–Maskawa matrix
NERFINISHED
ⓘ
Standard Model of particle physics NERFINISHED ⓘ |
| relatedTo |
V_ub via CKM hierarchy
ⓘ
Wolfenstein parameter A NERFINISHED ⓘ |
| relatesQuarkFlavor |
bottom quark
GENERATED
ⓘ
charm quark GENERATED ⓘ |
| symbolFor | CKM element between second and third quark generations ⓘ |
| usedIn |
global CKM fits
ⓘ
normalization of b → c semileptonic spectra ⓘ tests of CKM unitarity in the second and third columns ⓘ |
| usedToDetermine | strength of b → c weak transitions ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.