The q-mutator theory is used to connect the value of 1−|q|, the parameter measuring the “difference” between quons and ordinary bosons and fermions, to experiments that test the spin-statistics connection. Such calculations are best carried out using a density matrix formulation because a superselection rule prevents transitions between states associated with different representations of the permutation group. The interpretation of the experimental results, however, in terms of a quantitative limit on 1−|q| can be easily misled by the density matrix formulation. As a concrete example, the theory is applied to a spin-statistics test for photons. The formalism is then applied to spin-statistics tests for electrons in atomic helium and for 16O nuclei in molecules. Finally, the analysis is used to extend experimental limits on composite systems such as 16O nuclei to provide a test of the spin-statistics connection for the constituents of those composite systems (nucleons and quarks in the case of oxygen nuclei).

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