Form factors of descendant operators in the massive Lee-Yang model

Abstract

The form factors of the descendant operators in the massive Lee-Yang model are determined up to level 7. This is first done by exploiting the conserved quantities of the integrable theory to generate the solutions for the descendants starting from the lowest non-trivial solutions in each operator family. We then show that the operator space generated in this way, which is isomorphic to the conformal one, coincides, level by level, with that implied by the $S$-matrix through the form factor bootstrap. The solutions we determine satisfy asymptotic conditions carrying the information about the level that we conjecture to hold for all the operators of the model.

23 pages

References in corpus (3)

• Expectation value of composite field $T\bar{T}$ in two-dimensional quantum field theory
• Matrix elements of the operator T\bar{T} in integrable quantum field theory
• Counting minimal form factors of the restricted sine-Gordon model

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