Unpolarized and longitudinally polarized lepton forward-backward asymmetries in B{yields}K*l{sup +}l{sup -} decay in the fourth-generation standard model
Journal Article
·
· Physical Review. D, Particles Fields
- Institute for Studies in Theoretical Physics and Mathematics (IPM), P.O. Box 19395-5531, Tehran (Iran, Islamic Republic of)
- Physics Department, Shiraz University, Shiraz, 71454 (Iran, Islamic Republic of)
We investigate the influence of the fourth-generation quarks on the asymmetries for unpolarized and polarized leptons in B{yields}K*l{sup +}l{sup -} decay. We obtain that for both ({mu}, {tau}) 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{sup '}, b{sup '}) via its indirect manifestations in the loop diagrams.
- OSTI ID:
- 21035737
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 1 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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