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| Paper IPM / Physic / 8412 |
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| Abstract: | |||||
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The influence of the forth generation quarks to the single lepton
polarizations is investigated in Λb \rar Λ l+l− decay. Taking |Vt′sVt′b| ∼ {0.01−0.03} with
phase just below 90°, which are consistent with the b→sl+l− rate and the Bs mixing parameter ∆mBs,
We obtain that single lepton(μ, τ) polarizations are quite
sensitive to the existence of four generation. It can serve as a
good tool to search for new physics effects, precisely, to search
for fourth generation quarks(t′, b′).
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