New ideas for g-2 on the lattice

Details New ideas for g-2 on the lattice New ideas for g-2 on the lattice

2009-10-20

arxiv.org/abs/0910.3755v1

PoS LAT2009:143,2009

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 1 figure, 1 table, Talk presented at The XXVII International Symposium on Lattice Field Theory, LATTICE 2009 - Peking

Scientific paper

Using iso-spin symmetry the quark-connected and disconnected contributions to the hadronic vacuum polarisation in a theory with N_f=2 flavours can be described as independent correlation functions, respectively. We show how this allows to use twisted boundary conditions for the connected contribution in order to improve the q^2-resolution in lattice QCD. Furthermore we derive an exact relation between the connected and the disconnected contributions at NLO in chiral perturbation theory. We discuss extensions to theories with more than 2 dynamical flavours.

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