Hadronic τ decay data and a hybrid strategy for the lattice evaluation of the leading order hadronic vacuum polarization contribution to (g - 2)<inf>μ</inf>

Maarten Golterman, Kim Maltman, Santiago Peris

Research output: Contribution to journalArticleResearchpeer-review

Abstract

© 2015 Elsevier B.V. Starting from the dispersion relation for the I=1 vector polarization, we employ hadronic τ decay data to construct a highly physical model of the subtracted polarization and use this to investigate, and quantify, systematic issues in existing lattice determinations of the leading-order hadronic vacuum polarization contribution to the muon anomalous magnetic moment. The model is also used to demonstrate that a hybrid strategy, involving direct numerical integration of lattice data for Euclidean Q2 above ~0.1-0.2GeV2 and the use of three possible reliable low-Q2 representations to cover the region below this, serves to reduce the errors induced by the identified systematic problems to the sub-percent level, making the hybrid approach an attractive option for use in future lattice analyses.
Original languageEnglish
Pages (from-to)116-120
JournalNuclear and Particle Physics Proceedings
Volume260
DOIs
Publication statusPublished - 1 Mar 2015

Keywords

  • Lattice QCD
  • Muon anomalous magnetic moment
  • τ decay data

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