X iv : h ep - p h / 06 06 22 5 v 1 2 1 Ju n 20 06 Λ b → Λ l + l − decay in universal extra dimensions
نویسنده
چکیده
We study the exclusive Λb → Λl+l− decay in the Appelquist, Chang, Dobrescu model within one universal extra dimension. We investigate the sensitivity of the branching ratio, lepton polarization and forward–backward asymmetry AFB to the compactification parameter 1/R We obtain that the branching ratio changed about 50% compared to the SM value, when 1/R = 200 GeV and 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 zero position of AFB are very useful in looking for new physics in the framework of the UED models. PACS numbers: 12.60.–i, 13.30.–a, 14.20.Mr e-mail: [email protected] permanent address:Institute of Physics,Baku,Azerbaijan e-mail: [email protected]
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