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Paper   IPM / Physic / 8652
School of Physics
  Title:   The Effects of Fourth Generation on the Double Lepton Polarization in B \rar K l+ l Decay
1.  V. Bashiry
2.  S.M. Zebarjad
3.  F. Falahati
4.  K. Azizi
  Status:   Preprint
  Year:  2007
  Supported by:  IPM
This study investigates the influence of the fourth generation quarks on the double lepton polarizations in B \rar K l+l decay. Taking |VtsVtb| ∼ {0.01−0.03} with phase about 100°, which is consistent with the bsl+l rate and the Bs mixing parameter ∆mBs, we obtain that the double lepton(μ,  τ) polarizations are quite sensitive to the existence of fourth generation. It can serve as a good tool to search for new physics effects, precisely, to indirect search for the fourth generation quarks(t′, b′).

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