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• W4366389637 abstract "In this paper, we present an improved parameterization of the elastic scattering of spin-0 particles, which is based on a dispersive representation for the inverse scattering amplitude. Besides being based on well known general principles, the requirement that the inverse amplitude should satisfy the dispersion relation significantly constrains its possible forms and have not been incorporated in the existing parameterizations so far. While the right-hand cut of the inverse scattering amplitude is controlled by unitarity, the contribution from the left-hand cut, which comes from the crossing symmetry, is commonly ignored or incorporated improperly. The latter is parameterized using the expansion in a suitably constructed conformal variable, which accounts for its analytic structure. The correct implementations of the Adler zero and threshold factors for angular momentum $J>0$ are discussed in detail as well. The amplitudes are written in a compact analytic form and provide a useful tool to analyze current and future lattice data in the elastic region improving upon the commonly used Breit-Wigner or K-matrix approaches." @default.
• W4366389637 created "2023-04-21" @default.
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• W4366389637 date "2023-04-19" @default.
• W4366389637 modified "2023-10-03" @default.
• W4366389637 title "Analytical dispersive parametrization for elastic scattering of spinless particles" @default.
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• W4366389637 doi "https://doi.org/10.1103/physrevd.107.074021" @default.
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