High-precision calculation of the strange nucleon electromagnetic form factors
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...
| Main Authors: | , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2015
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| Online Access: | http://hdl.handle.net/1721.1/98284 https://orcid.org/0000-0002-5713-0039 |
| Summary: | 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. |
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