Regular Article - Theoretical Physics
Study of B s →φℓ + ℓ − decay in a single universal extra dimension model
Department of Physics, Yantai University, Yantai, 264-005, China
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Revised: 8 September 2011
Published online: 28 September 2011
Using form factors derived from the light-cone sum rules, we investigate B s →φℓ + ℓ − (ℓ=e,μ,τ) in a single universal extra dimension model (UED). In UED, there is only one new parameter with respect to the Standard Model (SM), which is the inverse of the compactification radius R of the extra dimension. In this work, the branching ratios, the dilepton invariant mass spectra, the forward–backward asymmetries, and the lepton polarization asymmetries of B s →φℓ + ℓ − are calculated. For a lower value of 1/R, there are some considerable discrepancies between the UED and SM. However, with the increase of 1/R, the effect of UED tends to diminish; in particular for 1/R≥1000 GeV, two models have approximately the same predictions. Compared with data from CDF for B s →φμ + μ −, we find that the 1/R tends to be larger than 350 GeV. We also find that the zero crossing point of the forward–backward asymmetry of B s →φμ + μ − becomes smaller, which would be an important platform for probing the UED effect. These results could be tested in the Large Hadron Collider (LHC) at CERN and the future super-B factory.
© Springer-Verlag / Società Italiana di Fisica, 2011