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LSZ in Action: Extracting Form Factors from Correlators Nonperturbatively in 2d $\phi^4$ Theory

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arxiv 2308.11091 v1 pith:EW3RAV3K submitted 2023-08-22 hep-th

classification hep-th
keywords truncationcomputefactorsformmethodtheoryvariousaction
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

In this paper, we compute multiparticle form factors of local operators in 2d $\phi^4$ 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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  1. Systematic Improvement of Hamiltonian Truncation Effective Theory

    hep-th 2025-07 conditional novelty 6.0 of 10

    NLO matching corrections with nonlocal terms are computed for 1+1D λφ⁴ Hamiltonian truncation, and the eigenvalue error is shown to scale as 1/Emax⁴, confirming the effective theory power counting.

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