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Λb→Λℓ+ℓ- decay in universal extra dimensions

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Abstract

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 \(\mathcal{A}_{\text{FB}}\) 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 \(\mathcal{A}_{\text{FB}}\) are very useful in looking for new physics in the framework of the UED models.

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Authors and Affiliations

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

    T.M. Aliev & M. Savcı

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  1. T.M. Aliev
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  2. M. Savcı
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Correspondence to M. Savcı.

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PACS

12.60.-i; 13.30.-a; 14.20.Mr

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Aliev, T., Savcı, M. Λb→Λℓ+ℓ- decay in universal extra dimensions. Eur. Phys. J. C 50, 91–99 (2007). https://doi.org/10.1140/epjc/s10052-006-0203-5

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  • DOI: https://doi.org/10.1140/epjc/s10052-006-0203-5

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