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We consider quantum spin systems with dimerization, which at strong couplinghave singlet ground states. To account for strong correlations, the excitationsare described as dilute Bose gas of degenerate triplets with infinite on-siterepulsion. This approach is applied to the two-layer Heisenberg model at zerotemperature with general couplings. Our analytic results for the triplet gap,the excitation spectrum and the location of the quantum critical point are inexcellent agreement with numerical results, obtained by dimer seriesexpansions.Comment: 4 pages, REVTex, 3 Postscript figure

Novel Approach to Description of Spin-Liquid Phases in Low-Dimensional Quantum Antiferromagnets