  We have investigated the correlation functions of interacting bosons at the
generic superfluid-insulator transition, a prototypical quantum phase
transition, in two dimensions in the spherical limit. Unexpectedly the spatial
correlation functions show non-power-law behavior consisting of two parts:
short-range correlation due to the particle-hole pair excitations and
long-range off-diagonal order due to the single-particle condensation. The
temporal correlation functions, on the other hand, show power-law behavior.
