CP violation and the 4th generation

Within the Standard model with the 4th generation quarks b and t we have analyzed CPviolating flavor changing neutral current processes t → cX, b → sX, b → bX, t → cX, and t → tX, with X = Z,H, γ, g, by constructing and employing global, unique fit for the 4th generation mass mixing matrix CKM4 at 300 ≤ mt′ ≤ 700 GeV. All quantities appearing in the CKM4 were subject to our fitting procedure. We have found that our fit produces the following CP partial rate asymmetry dominance: aCP (b ′ → s (Z,H, γ, g)) = (90, 73, 52, 30)%, at mt′ ≃ 300, 300, 380, 400 GeV, respectively. From the experimental point of view the best decay mode, out of the above four, is certainly b → s γ, because of the presence of a clean high energy single final state photon. We have also obtained relatively large aCP (t → cg) ≃ 15(10)% for t running in the loops with the mass mt′ = 650(500) GeV. There are fair chances that the 4th generation quarks will be discovered at Tevatron or LHC and that some of their decay rates shall be measured. If b and t exist at energies we assumed, with well executed tagging, large aCP could be found too. [email protected] [email protected] [email protected]