V_td
E815592
V_td is a complex element of the Cabibbo–Kobayashi–Maskawa (CKM) quark mixing matrix that quantifies the weak-interaction transition strength between top and down quarks and plays a key role in flavor-changing processes and CP violation in the Standard Model.
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
CKM matrix element
ⓘ
complex number ⓘ quark mixing parameter ⓘ |
| affects |
indirect CP violation in B_d systems
ⓘ
rates of top quark decays involving down quarks ⓘ |
| appearsIn |
W boson couplings to quarks
ⓘ
charged-current weak interactions ⓘ down-type quark flavor-changing amplitudes ⓘ effective Hamiltonians for flavor-changing neutral currents via loops ⓘ top quark decay amplitudes ⓘ |
| constrainedBy |
B meson mixing measurements
ⓘ
B_d–B̄_d oscillations ⓘ global CKM fits ⓘ rare B meson decays ⓘ |
| contributesTo |
CP violation in the Standard Model
ⓘ
flavor-changing processes ⓘ |
| definedIn | quark flavor eigenstate to mass eigenstate transformation ⓘ |
| dependsOn | Wolfenstein parameters ρ and η ⓘ |
| describes | weak-interaction transition strength between top and down quarks ⓘ |
| enters |
box diagrams for B_d mixing
ⓘ
penguin diagrams involving top quarks ⓘ |
| governs | t → d W^+ vertex strength ⓘ |
| hasComponent |
imaginary part of V_td
ⓘ
real part of V_td ⓘ |
| hasMagnitude | small compared to V_ud and V_tb ⓘ |
| hasProperty |
CP-violating phase contribution
ⓘ
complex phase ⓘ |
| hasQuarkTransition |
t → d
ⓘ
top quark to down quark ⓘ |
| hasRole | source of flavor mixing between third and first quark generations ⓘ |
| hasTheoreticalUncertainty | from hadronic matrix elements and lattice QCD inputs ⓘ |
| isElementOf | 3×3 unitary CKM matrix ⓘ |
| measuredBy |
flavor physics experiments at B factories
ⓘ
high-energy collider experiments ⓘ |
| namedAfter | indices t and d for top and down quarks ⓘ |
| parameterizedBy | Wolfenstein parametrization NERFINISHED ⓘ |
| partOf |
Cabibbo–Kobayashi–Maskawa matrix
NERFINISHED
ⓘ
Standard Model of particle physics NERFINISHED ⓘ |
| playsKeyRoleIn | precision tests of the Standard Model flavor sector ⓘ |
| relatedTo |
V_cd
ⓘ
V_tb ⓘ V_ts ⓘ V_ud ⓘ |
| satisfies | CKM unitarity constraints ⓘ |
| symbolOf | CKM matrix element in the first column and third row ⓘ |
| testedBy | consistency of CKM unitarity ⓘ |
| usedIn | unitarity triangle construction ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.