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<p>We demonstrate that the propagator, derived from an Effective Field Theory (EFT) that incorporates Weinberg’s compositeness theorem, provides a more general formula for describing S-wave near-threshold states. By fitting the lineshape using this propagator, we can extract the <i>Z</i> factor for these states and elucidate their structures.</p>

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The general propagator for S-wave threshold states

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月21日

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  • Hongge Xu,
  • Ning Yu,
  • Zuman Zhang,
  • Guoying Chen

摘要

We demonstrate that the propagator, derived from an Effective Field Theory (EFT) that incorporates Weinberg’s compositeness theorem, provides a more general formula for describing S-wave near-threshold states. By fitting the lineshape using this propagator, we can extract the Z factor for these states and elucidate their structures.