High-precision calculation of the strange nucleon electromagnetic form factors
Name
PhysRevD.92.031501.pdf
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527.92 KB
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Author(s)
Green, Jeremy
Meinel, Stefan
Engelhardt, Michael
Krieg, Stefan F.
Laeuchli, Jesse
Orginos, Kostas
Pochinsky, Andrew
Syritsyn, Sergey
Negele, John W.
Date Issued
August 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Green, Jeremy, Stefan Meinel, Michael Engelhardt, Stefan Krieg, Jesse Laeuchli, John Negele, Kostas Orginos, Andrew Pochinsky, and Sergey Syritsyn. "High-precision calculation of the strange nucleon electromagnetic form factors." Phys. Rev. D 92, 031501 (August 2015). © 2015 American Physical Society
Version
Final published version
Abstract
We report a direct lattice QCD calculation of the strange nucleon electromagnetic form factors G[s over E] and G[s over M] in the kinematic range 0 ≤ Q[superscript 2] ≲ 1.2 GeV[superscript 2]. For the first time, both G[s over E] and G[s over M] are shown to be nonzero with high significance. This work uses closer to physical lattice parameters than previous calculations, and achieves an unprecedented statistical precision by implementing a recently proposed variance reduction technique called hierarchical probing. We perform model-independent fits of the form factor shapes using the z-expansion and determine the strange electric and magnetic radii and magnetic moment. We compare our results to parity-violating electron-proton scattering data and to other theoretical studies.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.92.031501
