T violation in $\Lambda_b\to \Lambda\ell^+\ell^-$ decays with polarized   $\Lambda$
  We study the T violating effects in the baryonic decays of $\Lambda_b\to\Lambda l^+l^- (l=e ,\mu)$ with polarized $\Lambda$. We show that the transverse $\Lambda$ polarizations in these baryonic decays could be as large as 50% in CP violating theories beyond the standard model such as the SUSY models, which can be tested in various future hadron colliders. 
Chuan-Hung Chen, C.Q. Geng and J.N. Ng