Optimized cluster theory, optimized random phase approximation and mean spherical model for the square-well fluid with variable range

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Abstract
A critical evaluation of the optimized cluster theory, the optimized random phase approximation and the mean spherical model for describing the effect of attractive forces upon the structure and thermodynamics of liquids is given at the example of the square-well fluid with a variable range of the attractive interaction. Our results demonstrate that for a general width of the attractive well, the optimized cluster theory is more accurate than the mean spherical model.