“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 8766
School of Particles and Accelerator
  Title:   Double Lepton Polarization in Λb→Λl+l Decay in the Standard Model with Fourth Generations Scenario
1.  Vali Bashiry
2.  F . Zolfagharpour
  Status:   Published
  Journal: Nucl. Phys. B
  Year:  2008
  Pages:   294-319
  Supported by:  IPM
This study investigates the influence of the fourth generation quarks on the double lepton polarizations in decay by taking with phase . We will try to obtain a constrain on the mass of the 4th generation top like quark, which is consistent with the rate. With the above mentioned parameters, we will try to show that the double lepton 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 via its indirect manifestations in loop diagrams.

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