Journal of High Energy Physics (Feb 2024)

Finite volume form factors in integrable theories

  • Zoltan Bajnok,
  • Georgios Linardopoulos,
  • Istvan M. Szecsenyi,
  • Istvan Vona

DOI
https://doi.org/10.1007/jhep02(2024)083
Journal volume & issue
Vol. 2024, no. 2
pp. 1 – 46

Abstract

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Abstract We develop a new method to calculate finite size corrections for form factors in two-dimensional integrable quantum field theories. We extract these corrections from the excited state expectation value of bilocal operators in the limit when the operators are far apart. We elaborate the finite size effects explicitly up to the 3rd Lüscher order and conjecture the structure of the general form. We also fully recover the explicitly known massive fermion finite volume form factors.

Keywords