6533b82afe1ef96bd128c4a4
RESEARCH PRODUCT
A strategy to study the role of the charm quark in explaining the Delta{I}=1/2 rule
Mikko LaineLeonardo GiustiPeter WeiszPilar HernándezH. Wittigsubject
Nuclear and High Energy PhysicsParticle physicsChiral perturbation theoryHigh Energy Physics::LatticeLattice (group)FOS: Physical sciencesScale (descriptive set theory)weak decaysCharm quarkHigh Energy Physics - Phenomenology (hep-ph)lattice QCDHigh Energy Physics - Latticefield theory gauge theory lattice kaon decayskaon physicschiral lagrangiansLimit (mathematics)Quantum chromodynamicsPhysicsHigh Energy Physics - Lattice (hep-lat)High Energy Physics::PhenomenologyFísicaFIS/02 - FISICA TEORICA MODELLI E METODI MATEMATICIHigh Energy Physics - PhenomenologyAmplitudeOperator matrixHigh Energy Physics::Experimentdescription
We present a strategy designed to separate several possible origins of the well-known enhancement of the Delta{I}=1/2 amplitude in non-leptonic kaon decays. In particular, we seek to disentangle the contribution of physics at the typical QCD scale (soft-gluon exchange) from the effects at the scale of the charm quark mass. This is achieved by considering QCD with an unphysically light charm quark, so that the theory possesses an approximate SU(4)_L x SU(4)_R chiral symmetry. By computing the relevant operator matrix elements and monitoring their values as the charm quark mass departs from the SU(4)-symmetric situation, the role of the charm quark can be assessed. We study the influence of the charm quark mass in Chiral Perturbation Theory. First results from lattice simulations in the SU(4)-symmetric limit are also discussed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-07-05 |