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Paper   IPM / Physic / 8584
School of Physics
  Title:   Double Lepton Polarization in Λb \rar Λ l+ l Decay in the Standard Model with Four Generations Scenario
1.  F. Zolfagharpour
2.  V. Bashiry
  Status:   Preprint
  Year:  2007
  Supported by:  IPM
This study investigates the influence of the fourth generation quarks on the double lepton polarizations in Λb \rar Λl+ l decay. Taking |VtsVtb| ∼ {0.01−0.03} with phase {60°−90°}. We obtain a constrain on the mass of 4th generation top like quark t′, which is consistent with the bsl+l rate . With the above mentioned parameters, we show 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 search for the fourth generation quarks(t′, b′) via its indirect manifestations in loop diagrams.

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