Eur. Phys. J. C (2007) 50: 91-99
https://doi.org/10.1140/epjc/s10052-006-0203-5

Regular Article - Theoretical Physics

Λ_b→Λℓ⁺ℓ^- decay in universal extra dimensions

Physics Department, Middle East Technical University, 06531, Ankara, Turkey

^* e-mail: savci@metu.edu.tr

Received: 5 September 2006
Revised: 6 November 2006
Published online: 26 January 2007

Abstract

We study the exclusive Λ_b→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 Λ_b→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 Λ_b→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.