Up- and down-quark contributions to the nucleon electromagnetic form factors at low Q 2

Frontiers in Theoretical and Applied Physics/UAE 2017

Qattan, I.A.^1 ; Arrington, J.^2

Department of Physics, Khalifa University of Science and Technology, P.O. Box 127788, Abu Dhabi, United Arab Emirates^1

Physics Division, Argonne National Laboratory, Argonne

IL

60439, United States^2

关键词: Elastic electron scattering;    Electromagnetic form factors;    Form factors;    Large scale structures;    Nucleon form factors;    Proton and neutron;    Theoretical calculations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/869/1/012053/pdf
DOI  :  10.1088/1742-6596/869/1/012053

来源: IOP

【 摘 要 】

The spatial distribution of charge and magnetization within the nucleon (proton and neutron) is encoded in the elastic electromagnetic form factors GE(p,n)and GM(p,n). These form factors have been precisely measured utilizing elastic electron scattering, and the combination of proton and neutron form factors allows for the separation of the up- and down-quark contributions to the nucleon form factors. We expand on our original analyses and extract the up- and down-quark contributions to the nucleon electromagnetic form factors from worldwide data with an emphasis on precise new data covering the low-momentum region, which is sensitive to the large-scale structure of the nucleon. From these, we construct the flavor-separated Dirac and Pauli form factors and their ratios, and compare the results to recent extractions and theoretical calculations and models.