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| Paper IPM / P / 8739 |
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| Abstract: | |||||
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We investigate the influence of the fourth-generation quarks on
the asymmetries for unpolarized and polarized leptons in
B→ K*l+l− decay. We obtain that for both
(μ, τ) channels the magnitudes of the differential
forward-backward (FB) asymmetries and the average forward-backward
asymmetries are quite sensitive to the fourth-generation quarks'
mass and mixing parameters. We also achieve that, among the double
lepton polarization FB asymmetries, just longitudinally polarized
leptons' FB asymmetry shows considerable discrepancy with respect
to the third-generation standard model. Moreover, we find that
longitudinally polarized leptons' FB asymmetry and its variation
with new fourth-generation standard model parameters coincide with
unpolarized FB when the lepton mass vanishes. The study of FB
asymmetries 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 the loop diagrams.
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