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We give details of calculations analyzing the proposed mirror superpositionexperiment of Marshall, Simon, Penrose, and Bouwmeester within differentstochastic models for state vector collapse. We give two methods for exactlycalculating the fringe visibility in these models, one proceeding directly fromthe equation of motion for the expectation of the density matrix, and the otherproceeding from solving a linear stochastic unravelling of this equation. Wealso give details of the calculation that identifies the stochasticityparameter implied by the small displacement Taylor expansion of the CSL modeldensity matrix equation. The implications of the two results are brieflydiscussed. Two pedagogical appendices review mathematical apparatus needed forthe calculations.Comment: 9 pages, LaTeX. Minor changes mad

Towards quantum superpositions of a mirror: an exact open systems analysis—calculational details