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Decay rate, forward-backward asymmetry and polarization asymmetries of finalstate leptons in B-> K_{1}tau ^{+}tau ^{-}, where K_{1} is the axial vectormeson, are calculated in Standard Model and in the universal extra dimension(UED) model. The sensitivity of the observables on the compactification radius$R$, the only unknown paramter in UED model, is studied. Finally, the helicityfractions of the final state K_{1} are calculated and their dependence on thecompactification radius is discussed. This analysis of helicity fraction isbriefly extended to B->K^{*}l ^{+}l ^{-}(l =e,mu) and compared with the otherapproaches exist in the literature

Lepton polarization asymmetry and forward backward asymmetry in exclusive B->K_1 tau^(+)tau^(-) decay in universal extra dimension scenario