Paper detail

CP violation and the 4th generation

Within the Standard model with the 4th generation quarks b&#39; and t&#39; we have analyzed CP-violating flavor changing neutral current processes t -> cX; b&#39;-> sX, b&#39;-> bX,t&#39;-> cX, and t&#39;-> tX, with X=Z,H,gamma,g, by constructing and employing global, unique fit for the 4th generation mass mixing matrix CKM4 at 300 < m_t&#39; < 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: a_CP(b&#39;-> s(Z,H,gamma,g))= (90,73,52,30)%, at m_t&#39; ~ 300,300,380,400 GeV, respectively. From the experimental point of view the best decay mode, out of the above four, is certainly b&#39;-> s gamma, because of the presence of a clean high energy single final state photon. We have also obtained relatively large a_CP(t -> c g) ~ 15 (10)% for t&#39; running in the loops with the mass m_t&#39;= 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&#39; and t&#39; exist at energies we assumed, with well executed tagging, large a_CP could be found too.