T violation in $B\to K^{\ast }{\mathrm{\ell }}^{+}{\mathrm{\ell }}^{-}$ from SUSY

We propose to use T-odd momentum correlations as physical observables to study T violation in $B\to K^{\ast }{l}^{+}{l}^{-}(l=e,\mu )$ decays. We show that these observables are zero in the standard model but sizable at the level of 10% in the supersymmetric model. These large T violating effects are measurable at the B-factories in KEK and SLAC and future hadron colliders. We also point out that the T violating effects are insensitive to nonperturbative QCD contributions.