بررسی واپاشی -B→ρl+l در مدل استاندارد با نسل چهارم کوارک

عنوان انگليسی

Exclusive B→ρl+l- decay in the standard model with fourth-generation quarks

خلاصه انگلیسی

We investigate the influence of the fourth generation of quarks on the branching ratio, the CP asymmetry, and the polarization asymmetries in B→ρℓ+ℓ- decay. Taking |Vt′dVt′b|∼0.001 with phase about 10°, which is consistent with the sin⁡2ϕ1 of the Cabibbo-Kobayashi-Maskawa matrix and the Bd mixing parameter ΔmBd, we obtain that for both (μ,τ) channels the branching ratio is increased and the magnitude of CP asymmetry and polarization asymmetries decreased by the mass and mixing parameters of the 4th generation of quarks. These results can serve as a good tool to search for new physics effects, precisely, to search for the fourth generation of quarks (t′,b′) via its indirect manifestations in loop diagrams.

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