neutral kaon system
E543037
CP-violating system
flavor oscillation system
meson system
quantum two-state system
testbed for fundamental symmetries
The neutral kaon system is a quantum two-state system of strange mesons whose weak-interaction mixing and CP-violating behavior make it a key testing ground for fundamental symmetries in particle physics.
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
CP-violating system
ⓘ
flavor oscillation system ⓘ meson system ⓘ quantum two-state system ⓘ testbed for fundamental symmetries ⓘ |
| consistsOf |
K0 meson
GENERATED
ⓘ
anti-K0 meson GENERATED ⓘ |
| decaysVia |
semileptonic decays
GENERATED
ⓘ
three-pion final states GENERATED ⓘ two-pion final states GENERATED ⓘ |
| exhibits |
CP violation
GENERATED
ⓘ
T violation GENERATED ⓘ direct CP violation GENERATED ⓘ indirect CP violation GENERATED ⓘ |
| hasApproximateSymmetry | CP symmetry in the limit ε → 0 GENERATED ⓘ |
| hasComponent |
K0 (down anti-strange)
GENERATED
ⓘ
anti-K0 (strange anti-down) GENERATED ⓘ |
| hasEffectiveEigenstate |
KL (long-lived neutral kaon)
GENERATED
ⓘ
KS (short-lived neutral kaon) GENERATED ⓘ |
| hasObservable |
CP-violating parameter epsilon (ε)
GENERATED
ⓘ
decay width difference ΔΓ between KS and KL GENERATED ⓘ direct CP-violating parameter epsilon-prime (ε′) GENERATED ⓘ mass difference Δm between KS and KL GENERATED ⓘ |
| hasProperty |
flavor eigenstates differ from mass eigenstates
GENERATED
ⓘ
mass eigenstates KS and KL have different lifetimes GENERATED ⓘ mass eigenstates KS and KL have slightly different masses GENERATED ⓘ non-Hermitian effective Hamiltonian for decays GENERATED ⓘ |
| hasQuantumNumber |
isospin I = 1/2
GENERATED
ⓘ
spin 0 GENERATED ⓘ strangeness S = +1 for K0 GENERATED ⓘ strangeness S = −1 for anti-K0 GENERATED ⓘ |
| hasTheoreticalTool | density matrix formalism for decoherence studies GENERATED ⓘ |
| isDescribedBy |
Weisskopf–Wigner approximation
GENERATED
ⓘ
effective 2×2 Hamiltonian formalism GENERATED ⓘ standard model of particle physics GENERATED ⓘ |
| isGovernedBy |
electromagnetic interaction (for some decays)
GENERATED
ⓘ
strong interaction (for production and hadronization) GENERATED ⓘ weak interaction GENERATED ⓘ |
| isPrototypeFor | other neutral meson mixing systems (Bd, Bs, D0, B0s) GENERATED ⓘ |
| isUsedIn |
precision tests of quantum mechanics
GENERATED
ⓘ
searches for physics beyond the standard model GENERATED ⓘ |
| isUsedToTest |
CP symmetry
GENERATED
ⓘ
CPT symmetry GENERATED ⓘ T symmetry GENERATED ⓘ unitarity of the CKM matrix GENERATED ⓘ ΔS = ΔQ rule in weak decays GENERATED ⓘ |
| undergoes | K0–anti-K0 mixing GENERATED ⓘ |
| wasCentralTo | discovery of CP violation in 1964 GENERATED ⓘ |
| wasStudiedAt |
Brookhaven National Laboratory
GENERATED
ⓘ
CERN kaon experiments GENERATED ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.