Regular Article - Theoretical Physics
Λb→Λℓ+ℓ- decay in universal extra dimensions
Physics Department, Middle East Technical University, 06531, Ankara, Turkey
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Revised: 6 November 2006
Published online: 26 January 2007
We study the exclusive Λb→Λℓ+ℓ- decay in the Appelquist, Chang, Dobrescu model with a single universal extra dimension. We investigate the sensitivity of the branching ratio, lepton polarization and forward–backward asymmetry to the compactification parameter 1/R. We obtain the result that the branching ratio for the Λb→Λℓ+ℓ- (ℓ=μ,τ) decay changes about 25% compared to the SM value when 1/R=250 GeV, and the zero position of the forward–backward asymmetry is shifted to the left compared to the SM result. Therefore, measurement of the branching ratio of Λb→Λℓ+ℓ- decay and determination of the zero position of are very useful in looking for new physics in the framework of the UED models.
© Springer-Verlag Berlin Heidelberg, 2007