Journal Article/Contribution to a conference proceedings

FZJ-2013-06623

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Nucleon form factors with light Wilson quarks

Green, J. (Corresponding author) ; Engelhardt, M. ; Krieg, S.FZJ* ; Meinel, S. ; Negele, J. ; Pochinsky, A. ; Syritsyn, S.

2013
SISSA Trieste

Please use a persistent id in citations: http://hdl.handle.net/2128/10202

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 '$m_\pi L=4$' rule of thumb.

Note: arXiv:1310.7043

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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)

Research Program(s):

1. 411 - Computational Science and Mathematical Methods (POF2-411) (POF2-411)

Appears in the scientific report 2013

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Database coverage:

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