بررسی واپاشی −B→πℓ+ℓ در مدل استاندارد با نسل چهارم

عنوان انگليسی

Analysis of the B→πℓ+ℓ− decay in the standard model with fourth generation

خلاصه انگلیسی

Abstract: We investigate the influence of the fourth generation quarks on the branching ratio and the CP-asymmetry in B → πℓ+ℓ− decay. Taking the |Vt′dVt′b| ∼ 0.001 with phase about 10◦, which is consistent with the sin2φ1 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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