CP violation and the 4th generation

Abstract

Within the Standard model with the 4th generation quarks b' and t' we have analyzed CP-violating flavor changing neutral current processes t -> cX; b'-> sX, b'-> bX,t'-> cX, and t'-> 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' < 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'-> s(Z,H,gamma,g))= (90,73,52,30)%, at m_t' ~ 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 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' running in the loops with the mass m_t'= 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 a_CP could be found too.

19 pages, 12 figures, some of them new, references added, minor corrections in the text, version to appear in PRD

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Cited by in corpus (15)

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• SM with four generations: Selected implications for rare B and K decays
• Dynamical Electroweak Symmetry Breaking with a Heavy Fourth Generation
• Direct Mass Limits for Chiral Fourth-Generation Quarks in All Mixing Scenarios
• Scalar Dark Matter and Standard Model with Four Generations
• Next-to-Leading Order Cross Sections for New Heavy Fermion Production at Hadron Colliders
• Higgs data confronts Sequential Fourth Generation Fermions in the Higgs Triplet Model
• Flavour Theory: 2009
• Proton stability from a fourth family
• Collider signals of a composite Higgs in the Standard Model with four generations
• $CP$ asymmetries in the rare top decays $t\to c\gamma$ and $t\to cg$
• Detecting Fourth Generation Quarks at Hadron Colliders
• Higgs Phenomenology in Warped Extra-Dimensions with a 4th Generation
• Semileptonic B to Scalar meson Decays in the Standard Model with Fourth Generation
• Analyzing the anomalous dipole moment type couplings of heavy quarks with FCNC interactions at the CLIC