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Modified L\"uscher zeta-function and the modified effective range expansion in the presence of a long-range force

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arxiv 2507.18399 v1 pith:FCJXJBE6 submitted 2025-07-24 hep-lat

classification hep-lat
keywords modifieduscherzeta-functioneffectiveexpansionforcelong-rangepartial
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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.

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Cited by 1 Pith paper

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    nucl-th 2025-09 conditional novelty 6.0 of 10

    A data-calibrated quantization condition is proposed to extract nuclear scattering phase shifts from harmonic-trap spectra for neutral and charged particles.

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