The energy spectrum of the three-particle Hamiltonian obtained by replacing the two-body trigonometric potential of the Sutherland problem by a three-body one of a similar form is derived. When expressed in appropriate variables, the corresponding wave functions are shown to be expressible in terms of Jack symmetric polynomials. The exact solvability of the problem with three-body interaction is explained by a hidden sl(3,R) symmetry.
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C. Quesne (1997) studied this question.
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