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Paper   IPM / Physic / 8651
School of Physics
  Title:   Analysis of the B \rar πl+ l Decay in the Standard Model with Fourth Generation
  Author(s): 
1.  V. Bashiry
2.  K. Zeynali
  Status:   Published
  Journal: JHEP
  Vol.:  12
  Year:  2007
  Pages:   055
  Supported by:  IPM
  Abstract:
We investigate the influence of the fourth generation quarks on the branching ratio and the CP-asymmetry in B \rar πl+l decay. Taking the |VtdVtb| ∼ 0.001 with phase about 10°, which is consistent with the sin1 of the CKM and the Bd mixing parameter ∆mBd, we obtain that for both (μ,  τ) channels the branching ratio, the magnitude of CP-asymmetry and lepton polarization depict strong dependency on the 4th generation quarks mass and mixing parameters. These results 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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