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Paper   IPM / Physic / 8412
School of Physics
  Title:   The Effects of Fourth Generation on the Total Branching Ratio and the Lepton Polarization in λb → λl+l Decay
  Author(s): 
1.  V. Bashiry
2.  K. Azizi
  Status:   Published
  Journal: JHEP
  Vol.:  07
  Year:  2007
  Pages:   064
  Supported by:  IPM
  Abstract:
The influence of the forth generation quarks to the single lepton polarizations is investigated in Λb \rar Λ l+l decay. Taking |VtsVtb| ∼ {0.01−0.03} with phase just below 90°, which are consistent with the bsl+l rate and the Bs mixing parameter ∆mBs, We obtain that single lepton(μ,  τ) polarizations are quite sensitive to the existence of four generation. It can serve as a good tool to search for new physics effects, precisely, to search for fourth generation quarks(t′, b′).

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