Comparison of the Particle Flow in $q\overline{q}g$ and $q\overline{q}\gamma$ Events in $e^{+}{e}^{-}$ Annihilation

We compare the particle flow in the event plane of three-jet $q\overline{q}g$ (quark-antiquark-gluon) events with the particle flow in radiative annihilation events $q\overline{q}\gamma$ (quark-antiquark-photon) for similar kinematic configurations. In the angular region between quark and antiquark jet, we find a significant decrease in particle density for $q\overline{q}g$ as compared to $q\overline{q}\gamma$. This effect is predicted in QCD as a result of destructive interference between soft-gluon radiation from quark, antiquark, and hard gluon.