0000000000372363

AUTHOR

Jan Wennekers

showing 4 related works from this author

Testing chiral effective theory with quenched lattice QCD

2008

We investigate two-point correlation functions of left-handed currents computed in quenched lattice QCD with the Neuberger-Dirac operator. We consider two lattice spacings a ~ 0.09, 0.12 fm and two different lattice extents L ~ 1.5, 2.0 fm; quark masses span both the p- and the epsilon-regimes. We compare the results with the predictions of quenched chiral perturbation theory, with the purpose of testing to what extent the effective theory reproduces quenched QCD at low energy. In the p-regime we test volume and quark mass dependence of the pseudoscalar decay constant and mass; in the epsilon-regime, we investigate volume and topology dependence of the correlators. While the leading order b…

Quantum chromodynamicsPhysicsQuarkNuclear and High Energy PhysicsParticle physicsChiral perturbation theoryHigh Energy Physics::LatticeHigh Energy Physics - Lattice (hep-lat)Lattice Gauge theoryFOS: Physical sciencesFísicaParticle Physics - LatticeLattice QCDLattice QCDQCDFIS/02 - FISICA TEORICA MODELLI E METODI MATEMATICIPseudoscalarHigh Energy Physics - LatticeLattice (order)Effective field theoryExponential decayChiral lagrangians
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Non-perturbative renormalisation of left left four-fermion operators with Neuberger fermions

2006

We outline a general strategy for the non-perturbative renormalisation of composite operators in discretisations based on Neuberger fermions, via a matching to results obtained with Wilson-type fermions. As an application, we consider the renormalisation of the four-quark operators entering the Delta S=1 and Delta S=2 effective Hamiltonians. Our results are an essential ingredient for the determination of the low-energy constants governing non-leptonic kaon decays.

QuarkPhysicsNuclear and High Energy PhysicsParticle physicsHigh Energy Physics::LatticeHigh Energy Physics - Lattice (hep-lat)field theory gauge theory lattice renormalizationHigh Energy Physics::PhenomenologyFOS: Physical sciencesFísicaParticle Physics - LatticeFermionComposite operatorRenormalizationFIS/02 - FISICA TEORICA MODELLI E METODI MATEMATICIHigh Energy Physics - LatticeOperator (computer programming)High Energy Physics::ExperimentNon-perturbativeMathematical physics
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Determination of the ΔS=1 weak Hamiltonian of the SU(4) chiral limit through topological zero-mode wave functions

2008

38 pages, 9 figures.-- Published in: JHEP05(2008)043, available at: http://dx.doi.org/10.1088/1126-6708/2008/05/043 (open-acess).

PhysicsNuclear and High Energy PhysicsZero modeChiral perturbation theoryHigh Energy Physics::LatticeHigh Energy Physics::PhenomenologyFísicaObservableLattice QCDTopologyweak decaysCharm quarkPseudoscalarsymbols.namesakeHigh Energy Physics - Phenomenologylattice QCDHigh Energy Physics - Latticekaon physicssymbolsHamiltonian (quantum mechanics)Wave function
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K--pipi amplitudes from lattice QCD with a light charm quark.

2006

4 pages, 1 figure.-- PACS nrs.: 12.38.Gc, 13.25.Es, 11.30.Rd.-- ISI Article Identifier: 000244420700019.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-ph/0607220

QuarkPhysicsQuantum chromodynamicsParticle physicsChiral perturbation theoryTo-leading orderHigh Energy Physics::LatticeLattice field theoryHigh Energy Physics::PhenomenologyGeneral Physics and AstronomyFísica[PACS] Lattice QCD calculations[PACS] Chiral symmetries in particles and fieldsQuenched approximationLattice QCD[PACS] Hadronic decays of K mesonsCharm quarkHigh Energy Physics - PhenomenologyHigh Energy Physics - LatticePionChiral perturbation theoryHigh Energy Physics::ExperimentWeak interactionsWilson fermionsPhysical review letters
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