June 14th, 2021

лошадь, диаграмма, Фейнман

Электромагнитные формфакторы нуклона в дисперсионной теории

Dispersion-theoretical analysis of the electromagnetic form factors of the nucleon: Past, present and future: https://arxiv.org/abs/2106.06357
Yong-Hui Lin, Hans-Werner Hammer, Ulf-G. Meißner
We review the dispersion-theoretical analysis of the electromagnetic form factors of the nucleon. We emphasize in particular the role of unitarity and analyticity in the construction of the isoscalar and isovector spectral functions. We present new results on the extraction of the nucleon radii, the electric and magnetic form factors and the extraction of ω-meson couplings. All this is supplemented by a detailed calculation of the theoretical uncertainties, using bootstrap and Bayesian methods to pin down the statistical errors, while systematic errors are determined from variations of the spectral functions. We also discuss the physics of the time-like form factors and point out further issues to be addressed in this framework.
Comments: 31 pages, 33 pages, commissioned review article for EPJ A

Update 21.06.2021: внес в текст издания КЭД в твердой обложке.