Nucleon form factors with light Wilson quarks

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

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

We present nucleon observables - primarily isovector vector form factors - from calculations using 2+1 flavors of Wilson quarks. One ensemble is used for a dedicated high-precision study of excited-state effects using five source-sink separations between 0.7 and 1.6 fm. We also present results from a larger set of calculations that include an ensemble with pion mass 149 MeV and box size 5.6 fm, which nearly eliminates the uncertainty associated with extrapolation to the physical pion mass. The results show agreement with experiment for the vector form factors, which occurs only when excited-state contributions are reduced. Finally, we show results from a subset of ensembles that have pion mass 254 MeV with varying temporal and spatial box sizes, which we use for a controlled study of finite-volume effects and a test of the "mπL = 4" rule of thumb.

Original languageEnglish (US)
Article number276
JournalProceedings of Science
Volume29-July-2013
StatePublished - 2013
Externally publishedYes

ASJC Scopus subject areas

  • General

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    Green, J., Engelhardt, M., Krieg, S., Meinel, S., Negele, J., Pochinsky, A., & Syritsyn, S. (2013). Nucleon form factors with light Wilson quarks. Proceedings of Science, 29-July-2013, [276].