LSZ in action: extracting form factors from correlators nonperturbatively in 2d ϕ 4 theory

A. Fitzpatrick (Department of Physics, Boston University, Boston, MA, 02215, USA) ; Zhengxian Mei (Department of Physics, Harvard University, Cambridge, MA, 02138, USA)

In this paper, we compute multiparticle form factors of local operators in 2d ϕ 4 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.

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Published on:
27 March 2024
Publisher:
Springer
Published in:
Journal of High Energy Physics , Volume 2024 (2024)
Issue 3
Pages 1-27
DOI:
https://doi.org/10.1007/JHEP03(2024)154
arXiv:
2308.11091
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

Fulltext files: