Leading Effect of CP Violation with Four Generations

Abstract

In the Standard Model with a fourth generation of quarks, we study the relation between the Jarlskog invariants and the triangle areas in the 4-by-4 CKM matrix. To identify the leading effects that may probe the CP violation in processes involving quarks, we invoke small mass and small angle expansions, and show that these leading effects are enhanced considerably compared to the three generation case by the large masses of fourth generation quarks. We discuss the leading effect in several cases, in particular the possibility of large CP violation in $b\to s$ processes, which echoes the heightened recent interest because of experimental hints.

12 pages, no figure

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• An A_5 Model of Four Lepton Generations
• Electroweak Precision Observables within a Fourth Generation Model with General Flavour Structure
• Fourth Generation Majorana Neutrinos
• Electroweak Baryogenesis in a Scalar-Assisted Vector-Like Fermion Model
• Higgs Properties in the Fourth Generation MSSM: Boosted Signals Over the 3G Plan
• Higgs Phenomenology in Warped Extra-Dimensions with a 4th Generation
• Bounds on fourth generation induced Lepton Flavour Violating double insertions in Supersymmetry
• Z'-> ggg decay in left-right symmetric models with three and four fermion families
• Matter Effects of Sterile Neutrino in Light of Renormalization-Group Equations