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LSZ in action: extracting form factors from correlators nonperturbatively in 2d ϕ4 theory

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2024年3月27日

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  • A. Liam Fitzpatrick,
  • Zhengxian Mei

摘要

In this paper, we compute multiparticle form factors of local operators in 2d ϕ4 theory using a recently proposed method [1] for efficiently implementing the LSZ prescription with Hamiltonian Truncation methods, and we adopt Lightcone Conformal Truncation (LCT) in particular for our calculations. We perform various checks of our results at weak and strong coupling, and elucidate the parametric behavior of truncation errors. This opens up the possibility to compute S-matrix in various strongly coupled models using the LSZ method in LCT.