Suppression of excited-state effects in lattice determination of nucleon electromagnetic form factors

B. J\"ager; D. Djukanovic; G. M. von Hippel; H. B. Meyer; H. Wittig; J. Hua; P. Junnarkar; S. Capitani; T. D. Rae

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Suppression of excited-state effects in lattice determination of nucleon electromagnetic form factors

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arxiv 1411.4804 v1 pith:XHZLGTW2 submitted 2014-11-18 hep-lat

G. M. von Hippel , S. Capitani , D. Djukanovic , J. Hua , B. Jäger , P. Junnarkar , H. B. Meyer , T. D. Rae

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H. Wittig

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keywords factorsformnucleonexcited-stateabilityableapproachingconjunction

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abstract

We study the ability of a variety of fitting techniques to extract the ground state matrix elements of the vector current from ratios of nucleon three- and two-point functions that contain contaminations from excited states. Extending our high-statistics study of nucleon form factors, we are able to demonstrate that the treatment of excited-state contributions in conjunction with approaching the physical pion mass has a significant impact on the $Q^2$-dependence of the form factors.

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