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

Towards a precise lattice determination of the leading hadronic contribution to (g-2)_mu
Towards a precise lattice determination of the leading hadronic contribution to (g-2)_mu
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 aHLO? on m ? especially for small pion masses. The final result, aHLO?=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.
lattice gauge field theories, nonperturbative effects lattice quantum field theory
1-19
Della Morte, Michele
9f194168-6e53-4d48-ae87-40e954a86c41
Jäger, Benjamin
f149bca7-e9bb-4f79-8a28-d4d5749dc6da
Juttner, Andreas
a90ff7c5-ae8f-4c8e-9679-b5a95b2a6247
Wittig, Hartmut
c782e4fa-6398-4cca-96e7-7651ff8cbe69
Della Morte, Michele
9f194168-6e53-4d48-ae87-40e954a86c41
Jäger, Benjamin
f149bca7-e9bb-4f79-8a28-d4d5749dc6da
Juttner, Andreas
a90ff7c5-ae8f-4c8e-9679-b5a95b2a6247
Wittig, Hartmut
c782e4fa-6398-4cca-96e7-7651ff8cbe69

Della Morte, Michele, Jäger, Benjamin, Juttner, Andreas and Wittig, Hartmut (2012) Towards a precise lattice determination of the leading hadronic contribution to (g-2)_mu. Journal of High Energy Physics, 2012 (3), 1-19. (doi:10.1007/JHEP03(2012)055).

Record type: Article

Abstract

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 aHLO? on m ? especially for small pion masses. The final result, aHLO?=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.

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More information

Accepted/In Press date: 28 February 2012
Published date: 19 March 2012
Additional Information: Imported from arXiv
Keywords: lattice gauge field theories, nonperturbative effects lattice quantum field theory
Organisations: Theoretical Partical Physics Group

Identifiers

Local EPrints ID: 338444
URI: https://eprints.soton.ac.uk/id/eprint/338444
PURE UUID: be6397cf-1ce8-41da-8eec-42113a7eeace

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Date deposited: 28 Apr 2016 15:46
Last modified: 18 Jul 2017 05:57

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