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The quantum critical point of the three-dimensional XY model in asymmetry-preserving field is investigated. The results of Monte Carlosimulations with the directed-loop algorithm show that the quantum criticalbehavior is characterized by the mean-field values of critical exponents. Thesystem-size dependence of various quantities is compared to a simplefield-theoretical argument that supports the mean-field scaling

Quantum Critical Point of theXYModel and Condensation of Field-induced Quasiparticles in Dimer Compounds