Modified L\"uscher zeta-function and the modified effective range expansion in the presence of a long-range force
Abstract
An efficient numerical algoritm is proposed for the calculation of the modified L\"uscher zeta-function in the presence of a long-range force. Using the formalism developed in Ref.~\cite{Bubna:2024izx} for the analysis of synthetic data on the finite-volume energy levels in a toy model, it is demonstrated that, in contrast to the standard L\"uscher approach, the truncation of the higher partial waves has very little effect on the final result. Furthermore, the regularization and renormalization of the modified L\"uscher zeta-function is discussed in detail, as well as the problems arising within the cutoff regularization. It is shown that, using the renormalization scheme proposed in the present paper, one obtains modified effective range expansion parameters of natural size in all partial waves.
Keywords
Cite
@article{arxiv.2507.18399,
title = {Modified L\"uscher zeta-function and the modified effective range expansion in the presence of a long-range force},
author = {Rishabh Bubna and Hans-Werner Hammer and Bai-Long Hoid and Jin-Yi Pang and Akaki Rusetsky and Jia-Jun Wu},
journal= {arXiv preprint arXiv:2507.18399},
year = {2025}
}
Comments
28 pages, 9 figures