  Double-lepton polarization asymmetries in (Lambda_b -> Lambda l^+ l^-) decay
are calculated in universal extra dimension (UED) model. It is obtained that
numerous double-lepton polarization asymmetries are very sensitive to the UED
model and therefore can be very useful tool for establishing new physics
predicted by the UED model.establishing new physics predicted by the UED model.

High Energy Physics - Phenomenology