The hadronic vacuum polarization contribution to a_μ from full lattice QCD

2016/01/12 by Bipasha Chakraborty, C. T. H. Davies, P. G. de Oliviera +3 · 1 voice
Physics and Astronomy · #hep-lat #hep-ph

paper · pdf · doi:10.1103/physrevd.96.034516

published as Phys. Rev. D 96, 034516 (2017) · 14 pages, 10 figures. Discussion of method extended with additional tests and figures added. Typographical errors corrected

arxiv published 2016/01/12 · arxiv created 2017/05/28 · arxiv updated 2017/05/28

Abstract

We determine the contribution to the anomalous magnetic moment of the muon from the α²_QED hadronic vacuum polarization diagram using full lattice QCD and including u/d quarks with physical masses for the first time. We use gluon field configurations that include u, d, s and c quarks in the sea at multiple values of the lattice spacing, multiple u/d masses and multiple volumes that allow us to include an analysis of finite-volume effects. We obtain a result for a_μ^HVP,LO of 667(6)(12), where the first error is from the lattice calculation and the second includes systematic errors from missing QED and isospin-breaking effects and from quark-line disconnected diagrams. Our result implies a discrepancy between the experimental determination of a_μ and the Standard Model of 3σ.

Discussions

• A first result from lattice calculations - see http://arxiv.org/abs/1601.03071 - could perhpas simply that the #moun g-2 anomaly may indeed be there [bsky, 0 points, 0 comments]

Related

• The hadronic vacuum polarization contribution to (g_μ-2): Lattice QCD+QED calculations
• Hybrid calculation of hadronic vacuum polarization in muon g-2 to 0.48%
• Leading hadronic contribution to the muon magnetic moment from lattice QCD
• Hadronic vacuum polarization for the muon g-2 from lattice QCD: Complete short and intermediate windows
• Hadronic corrections to the muon anomalous magnetic moment from lattice QCD