Search results for "n-point function: 4"

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Hadronic light-by-light contribution to $(g-2)_\mu$ from lattice QCD with SU(3) flavor symmetry

2020

We perform a lattice QCD calculation of the hadronic light-by-light contribution to $(g-2)_\mu$ at the SU(3) flavor-symmetric point $m_\pi=m_K\simeq 420\,$MeV. The representation used is based on coordinate-space perturbation theory, with all QED elements of the relevant Feynman diagrams implemented in continuum, infinite Euclidean space. As a consequence, the effect of using finite lattices to evaluate the QCD four-point function of the electromagnetic current is exponentially suppressed. Thanks to the SU(3)-flavor symmetry, only two topologies of diagrams contribute, the fully connected and the leading disconnected. We show the equivalence in the continuum limit of two methods of computin…

symmetry: flavorParticle physicstopologymagnetic momentPhysics and Astronomy (miscellaneous)Feynman graphHigh Energy Physics::LatticeLattice field theoryHadronExtrapolationhep-lat01 natural sciencesspace: Euclideansymbols.namesakePionHigh Energy Physics - LatticeLattice (order)quantum chromodynamics0103 physical sciencesquantum electrodynamicsFeynman diagramcontinuum limit010306 general physicsEngineering (miscellaneous)perturbation theorylatticeParticle Physics - PhenomenologyQuantum chromodynamicsPhysicsform factor: transitioncurrent: electromagneticfinite size: effect[PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat]010308 nuclear & particles physicslattice field theoryphoton photon: scatteringhep-phParticle Physics - LatticeLattice QCDsuppressionHigh Energy Physics - Phenomenology[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]symbolsflavor: SU(3)n-point function: 4
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Hadronic light-by-light contribution to $(g-2)_\mu $ from lattice QCD: a complete calculation

2021

The European physical journal / C 81(7), 651 (2021). doi:10.1140/epjc/s10052-021-09455-4

Particle physicsmagnetic momentPhysics and Astronomy (miscellaneous)High Energy Physics::LatticeHadronNuclear TheoryLattice (group)hep-lat01 natural sciences530pi: massPionHigh Energy Physics - Latticemuon0103 physical sciencesddc:530010306 general physicsEngineering (miscellaneous)latticeParticle Physics - PhenomenologyPhysicsMuon010308 nuclear & particles physicsScattering[PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat]High Energy Physics::Phenomenologylattice field theoryphoton photon: scatteringhep-phParticle Physics - LatticeFunction (mathematics)Lattice QCDtensionQuadrature (mathematics)High Energy Physics - Phenomenology[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]High Energy Physics::Experimentn-point function: 4statistical
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