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The Effects of Fourth Generation on the Total Branching Ratio and the Lepton Polarization in $\Lambda_b \rar \Lambda \ell^+ \ell^-$ decay
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abstract
This study investigates the influence of the fourth generation quarks on the total branching ratio and the single lepton polarizations in \Lambda_b --> \Lambda \ell^+ \ell^- decay. Taking $|V_{t's}V_{t'b}| {0.01-0.03} with phase just below $90^\circ$, which is consistent with the b\to s\ell^+\ell^- rate and the B_s mixing parameter \Delta m_{B_s}, we obtain that the total branching ratio and the single lepton(\mu, \tau) 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(t', b').
Forward citations
Cited by 1 Pith paper
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Lepton polarization dependent angular observables and the polarization asymmetries in the four-fold $\Lambda_b \rightarrow \Lambda(\rightarrow N \pi) \ell^+\ell^-$ decay
The authors derive the lepton-polarized four-fold angular distributions for Λ_b→Λ(→Nπ)ℓ⁺ℓ⁻, identify new angular coefficients for normal and transverse polarizations, and provide SM and NP predictions for the polariza...
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