Scholarlink

<p>The calculation of resonance form factors in effective field theory as well as on the lattice is a highly challenging task. In a recent paper [1], we proposed a novel method based on the introduction of a background field and the Feynman-Hellmann theorem to address the problem, and applied it to a toy model. In the present work we use this method for the electromagnetic form factors of the <i>ρ</i>-meson. By matching the results to Chiral Perturbation Theory, we provide a first, crude estimate of all three form factors of the <i>ρ</i>-meson within the effective field theory. Contact contributions to these form factors turn out to be substantial. A procedure for lattice calculations is outlined, paving the way for an ab initio approach to the problem.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Form factors of the ρ meson from effective field theory and the lattice

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年6月15日

查看全文
  • Ulf-G. Meißner,
  • Akaki Rusetsky,
  • Ajay S. Sakthivasan,
  • Gerrit Schierholz,
  • Jia-Jun Wu

摘要

The calculation of resonance form factors in effective field theory as well as on the lattice is a highly challenging task. In a recent paper [1], we proposed a novel method based on the introduction of a background field and the Feynman-Hellmann theorem to address the problem, and applied it to a toy model. In the present work we use this method for the electromagnetic form factors of the ρ-meson. By matching the results to Chiral Perturbation Theory, we provide a first, crude estimate of all three form factors of the ρ-meson within the effective field theory. Contact contributions to these form factors turn out to be substantial. A procedure for lattice calculations is outlined, paving the way for an ab initio approach to the problem.