Towards a precise lattice determination of the leading hadronic contribution to (g-2)_mu

Michele Della Morte*, Benjamin Jäger, Andreas Jüttner, Hartmut Wittig

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


We report on our computation of the leading hadronic contribution to the anomalous magnetic moment of the muon using two dynamical flavours of non-perturbatively O(a) improved Wilson fermions. The strange quark is introduced in the quenched approximation. Partially twisted boundary conditions are applied to improve the momentum resolution in the relevant integral. Our results, obtained at three different values of the lattice spacing, allow for a preliminary study of discretization effects. We explore a wide range of lattice volumes, namely 2 fm <L <3 fm, with pion masses from 600 to 280 MeV and discuss different chiral extrapolations to the physical point. We observe a non-trivial dependence of a_mu(HLO) on m_pi especially for small pion masses. The final result, a_mu(HLO)=618(64)*10^(-10), is obtained by considering only the quark connected contribution to the vacuum polarization. We present a detailed analysis of systematic errors and discuss how they can be reduced in future simulations.
Original languageEnglish
Article number55
JournalJournal of High Energy Physics
Publication statusPublished - 2012
Externally publishedYes


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