Lepton polarization asymmetry and forward–backward asymmetry in exclusive B→K1τ+τ- decay in universal extra dimension scenario

Abstract

Decay rate, forward–backward asymmetry and polarization asymmetries of the final state leptons in B→K1τ+τ-, where K1 is the axial vector meson, are calculated in the standard model and in the universal extra dimension (UED) model. The sensitivity of the observables to the compactification radius R, the only unknown parameter in the UED model, is studied. Finally, the helicity fractions of the final state K1 are calculated and their dependence on the compactification radius is discussed. This analysis of the helicity fraction is briefly extended to B→K*ℓ+ℓ- (ℓ=e,μ) and compared with the other approaches existing in the literature.