arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.0903nucl-thnucl-ex
收藏

介子在核子电磁形状因子中的作用

The Role of Mesons in the Electromagnetic Form Factors of the Nucleon

C. Crawford, T. Akdogan, R. Alarcon, W. Bertozzi, E. Booth, T. Botto, J. R. Calarco, B. Clasie, A. DeGrush, T. W. Donnelly, K. Dow, M. Farkhondeh, R. Fatemi, O.… 展开作者

C. Crawford, T. Akdogan, R. Alarcon, W. Bertozzi, E. Booth, T. Botto, J. R. Calarco, B. Clasie, A. DeGrush, T. W. Donnelly, K. Dow, M. Farkhondeh, R. Fatemi, O. Filoti, W. Franklin, H. Gao, E. Geis, S. Gilad, D. Hasell, P. Karpius, M. Kohl, H. Kolster, T. Lee, E. Lomon, A. Maschinot, J. Matthews, K. McIlhany, N. Meitanis, R. Milner, J. Rapaport, R. Redwine, J. Seely, A. Shinozaki, A. Sindile, S. Sirca, E. Six, T. Smith, B. Tonguc, C. Tschalaer, E. Tsentalovich, W. Turchinetz, Y. Xiao, W. Xu, C. Zhang, Z. Zhou, V. Ziskin, T. Zwart

备注：
Resubmitted to PRC
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

本文以耦合到连续介质的矢量介子模型和微扰QCD的渐近$Q^2$行为为基础，研究了介子在核子电磁形状因子中的作用.具体而言，采用了由Lomon开发的矢量优势模型（GKex），因为众所周知，它在代表迄今为止公布的现有高质量数据方面非常成功。分析了GKex模型和数据之间的差异在正交基函数中展开时存在的实验不确定性。本研究的一个主要动机是提供洞察如何在这个模型中的各种成分产生的测量行为，包括讨论时偶极子形状因子是预期或不，其中介子是主要的贡献者，例如，在低- $Q^2$或大的距离，以及什么影响预测耦合到连续。这种见解首先在动量空间中讨论，然后分析当实验和理论电形状因子被傅立叶变换到坐标空间时，如何出现不同的和潜在有用的信息。虽然这些傅立叶变换不应被解释为“电荷分布”，但各种介子所起的作用，特别是在大或小的距离尺度上占主导地位的介子，可以通过这种实验-理论比较来探索。

英文摘要：

The roles played by mesons in the electromagnetic form factors of the nucleon are explored using as a basis a model containing vector mesons with coupling to the continuum together with the asymptotic $Q^2$ behavior of perturbative QCD. Specifically, the vector dominance model (GKex) developed by Lomon is employed, as it is known to be very successful in representing the existing high-quality data published to date. An analysis is made of the experimental uncertainties present when the differences between the GKex model and the data are expanded in orthonormal basis functions. A main motivation for the present study is to provide insight into how the various ingredients in this model yield the measured behavior, including discussions of when dipole form factors are to be expected or not, of which mesons are the major contributors, for instance, at low-$Q^2$ or large distances, and of what effects are predicted from coupling to the continuum. Such insights are first discussed in momentum space, followed by an analysis of how different and potentially useful information emerges when both the experimental and theoretical electric form factors are Fourier transformed to coordinate space. While these Fourier transforms should not be interpreted as "charge distributions", nevertheless the roles played by the various mesons, especially which are dominant at large or small distance scales, can be explored via such experiment--theory comparisons.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑