Lepton anomalous magnetic moments from twisted mass fermions
Florian Burger, Grit Hotzel, Karl Jansen, Marcus Petschlies
TL;DR
This paper calculates the leading-order hadronic contributions to the anomalous magnetic moments of electron, muon, and tau using twisted mass fermions, achieving agreement with phenomenological results and analyzing systematic effects.
Contribution
It provides a lattice QCD calculation of lepton magnetic moments with four dynamical quarks, including systematic analysis and comparison of quark-disconnected contributions.
Findings
Full agreement with phenomenological results.
Systematic effects analyzed and controlled.
Quark-disconnected contributions estimated on one ensemble.
Abstract
We present our results for the leading-order hadronic quark-connected contributions to the electron, the muon, and the tau anomalous magnetic moments obtained with four dynamical quarks. Performing the continuum limit and an analysis of systematic effects, full agreement with phenomenological results is found. To estimate the impact of omitting the quark-disconnected contributions to the hadronic vacuum polarisation we investigate them on one of the four-flavour ensembles. Additionally, the light quark contributions on the four-flavour sea are compared to the values obtained for physically light quarks. In the latter case different methods to fit the hadronic vacuum polarisation function are tested.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research