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We study the radiative dileptonic $B \rar \gamma l^+ l^- $ transition in thepresence of a universal extra dimension in the Applequist-Cheng-Dobrescu model.In particular, using the corresponding form factors calculated via light coneQCD sum rules, we analyze the branching ratio and double lepton polarizationasymmetries related to this channel and compare the results with thepredictions of the standard model. We show how the results deviate frompredictions of the standard model at lower values of the compactificationfactor ($1/R $) of extra dimension.

Double-Lepton Polarization Asymmetries and Branching Ratio of the $B\rar \gamma l^+ l^- $ transition in Universal Extra Dimension