Utilizing form factors calculated within the light-cone sum rules, we have
evaluated the decay branching ratios of Bs​→ϕγ and Bs​→ϕℓ+ℓ− in a single universal extra dimension model (UED), which is
viewed as one of the alternative theories beyond the standard model (SM). For
the decay Bs​→ϕℓ+ℓ−, the dilepton invariant mass spectra, the
forward-backward asymmetry, and double lepton polarization are also calculated.
For each case, we compared the obtained results with predictions of the SM. In
lower values of the compactification factor 1/R, the only parameter in this
model, we see the considerable discrepancy between the UED and SM models.
However, when 1/R increases, the results of UED tend to diminish and at 1/R=1000GeV, two models have approximately the same predictions.
Compared with data from CDF of Bs​→ϕμ+μ−, the 1/R tends to be
larger than 350GeV. We also note that the zero crossing point of
the forward-backward asymmetry is become smaller, which will be an important
plat to prob the contribution from the extra dimension model. The results
obtained in this work will be very useful in searching new physics beyond SM.
Moreover, the order of magnitude for branching ratios shows a possibility to
study these channels at the Large Hadron Collider (LHC), CDF and the future
super-B factory.Comment: 13 pages, 16 figure