Lepton polarization correlations in [Formula Presented]

In this work we will study the polarizations of both leptons [Formula Presented] in the decay channel [Formula Presented] In the case of the dileptonic inclusive decay [Formula Presented] where apart from the polarization asymmetries of a single lepton [Formula Presented] one can also observe the polarization asymmetries of both leptons simultaneously. If this sort of measurement is possible then we can have, apart from decay rate, forward backward asymmetry and the six single lepton polarization asymmetries (three each for [Formula Presented] and [Formula Presented] nine more double polarization asymmetries. This will give us a very useful tool in more strict testing of the standard model (SM) and the physics beyond. We discuss the double polarization asymmetries of the [Formula Presented] leptons in the decay mode [Formula Presented] within the SM and the minimal supersymmetric extension of it.