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

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

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

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.
OriginalsprogUdefineret/Ukendt
TidsskriftJournal of High Energy Physics (JHEP)
ISSN1126-6708
DOI
StatusUdgivet - 13. dec. 2011

Bibliografisk note

Version accepted for publication in JHEP. Discussions extended in sections 3.1 and 3.2, results unchanged. 19 pages, 7 figures, 3 tables

Emneord

  • hep-lat
  • hep-ph

Citer dette

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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 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.",
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Towards a precise lattice determination of the leading hadronic contribution to (g-2)_mu. / Morte, Michele Della; Jäger, Benjamin; Jüttner, Andreas; Wittig, Hartmut.

I: Journal of High Energy Physics (JHEP), 13.12.2011.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Towards a precise lattice determination of the leading hadronic contribution to (g-2)_mu

AU - Morte, Michele Della

AU - Jäger, Benjamin

AU - Jüttner, Andreas

AU - Wittig, Hartmut

N1 - Version accepted for publication in JHEP. Discussions extended in sections 3.1 and 3.2, results unchanged. 19 pages, 7 figures, 3 tables

PY - 2011/12/13

Y1 - 2011/12/13

N2 - 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.

AB - 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.

KW - hep-lat

KW - hep-ph

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DO - 10.1007/JHEP03(2012)055

M3 - Tidsskriftartikel

JO - Journal of High Energy Physics (Online)

JF - Journal of High Energy Physics (Online)

SN - 1126-6708

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