Nucleon electromagnetic form factors at high Q2 from Wilson-clover fermions

Christos Kallidonis, Sergey Syritsyn, Michael Engelhardt, Jeremy Green, Stefan Meinel, John Negele, Andrew Pochinsky

Research output: Contribution to journalConference article

Abstract

We present results on the nucleon electromagnetic form factors from Lattice QCD at momentum transfer up to about 12 GeV2. We analyze two gauge ensembles with the Wilson-clover fermion action, a lattice spacing of a≈0.09 fm and pion masses mπ ≈170 MeV and mπ ≈280 MeV. In our analysis we employ momentum smearing as well as a set of techniques to investigate excited state effects. Good agreement with experiment and phenomenology is found for the ratios GE/GM and F2/F1, whereas discrepancies are observed for the individual form factors F1 and F2. We discuss various systematics that may affect our calculation.

Original languageEnglish (US)
Article number125
JournalProceedings of Science
Volume334
StatePublished - Jan 1 2018
Event36th Annual International Symposium on Lattice Field Theory, LATTICE 2018 - East Lansing, United States
Duration: Jul 22 2018Jul 28 2018

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form factors
fermions
electromagnetism
phenomenology
momentum transfer
pions
quantum chromodynamics
spacing
momentum
excitation

ASJC Scopus subject areas

  • General

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Kallidonis, C., Syritsyn, S., Engelhardt, M., Green, J., Meinel, S., Negele, J., & Pochinsky, A. (2018). Nucleon electromagnetic form factors at high Q2 from Wilson-clover fermions. Proceedings of Science, 334, [125].

Nucleon electromagnetic form factors at high Q2 from Wilson-clover fermions. / Kallidonis, Christos; Syritsyn, Sergey; Engelhardt, Michael; Green, Jeremy; Meinel, Stefan; Negele, John; Pochinsky, Andrew.

In: Proceedings of Science, Vol. 334, 125, 01.01.2018.

Research output: Contribution to journalConference article

Kallidonis, C, Syritsyn, S, Engelhardt, M, Green, J, Meinel, S, Negele, J & Pochinsky, A 2018, 'Nucleon electromagnetic form factors at high Q2 from Wilson-clover fermions', Proceedings of Science, vol. 334, 125.
Kallidonis C, Syritsyn S, Engelhardt M, Green J, Meinel S, Negele J et al. Nucleon electromagnetic form factors at high Q2 from Wilson-clover fermions. Proceedings of Science. 2018 Jan 1;334. 125.
Kallidonis, Christos ; Syritsyn, Sergey ; Engelhardt, Michael ; Green, Jeremy ; Meinel, Stefan ; Negele, John ; Pochinsky, Andrew. / Nucleon electromagnetic form factors at high Q2 from Wilson-clover fermions. In: Proceedings of Science. 2018 ; Vol. 334.
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AB - We present results on the nucleon electromagnetic form factors from Lattice QCD at momentum transfer up to about 12 GeV2. We analyze two gauge ensembles with the Wilson-clover fermion action, a lattice spacing of a≈0.09 fm and pion masses mπ ≈170 MeV and mπ ≈280 MeV. In our analysis we employ momentum smearing as well as a set of techniques to investigate excited state effects. Good agreement with experiment and phenomenology is found for the ratios GE/GM and F2/F1, whereas discrepancies are observed for the individual form factors F1 and F2. We discuss various systematics that may affect our calculation.

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