@article{Lashkevich2013OnFF,
title={On form factors and Macdonald polynomials},
author={M. Lashkevich and Y. Pugai},
journal={Journal of High Energy Physics},
year={2013},
volume={2013},
pages={1-18}
}

A bstractWe are developing the algebraic construction for form factors of local operators in the sinh-Gordon theory proposed in [1]. We show that the operators corresponding to the null vectors in this construction are given by the degenerate Macdonald polynomials with rectangular partitions and the parameters t = −q on the unit circle. We obtain an integral representation for the null vectors and discuss its simple applications.