منابع مشابه
Alternative Theories of CP violation
Recent improvements to the limit of ∆MBs imply that pure superweak theories, while not excluded, no longer provide a good fit to the data. A class of general superweak theories is introduced in which all flavor changing interactions are governed by an approximate flavor symmetry which gives a “3 mechanism”. These theories are in good agreement with data, and predict low values for |Vtd|, |Vub/V...
متن کاملCP violation in supersymmetric theories
We review the present status of CP violating problem in supersymmetric extensions of the standard model. We analyze the constraints imposed by the experimental limits of the electron, neutron, and mercury electric dipole moments on the supersymmetric CP phases and show that only the scenarios with flavour-offdiagonal CP violation remain attractive. These scenarios require hermitian Yukawa matri...
متن کاملSpontaneous CP violation in supersymmetric theories.
We study the minimal version of the supersymmetric standard model with spontaneous CP breaking. In this model, the KM matrix is real and contributions to ε arise from box diagrams involving squarks. We analyze the region of the parameter space which corresponds to values for ε, ε′/ε and the neutron electric dipole moment (NEDM) in agreement with the experimental data. We show that the CP violat...
متن کاملCP-Violation in Kaluza-Klein and Randall-Sundrum Theories
The Kaluza-Klein theory and Randall-Sundrum theory are examined comparatively, with focus on the five dimensional (Dirac) fermion and the dimensional reduction to four dimensions. They are treated in the Cartan formalism. The chiral property, localization, anomaly phenomena are examined. The electric and magnetic dipole moment terms naturally appear. The order estimation of the couplings is don...
متن کاملSpontaneous Cp Violation: Alternative to the Standard Model
We propose a model of soft CP violation that evades the strong CP problem and can describe observed CP violation in the neutral kaon sector, both direct and indirect. Our model requires two “duark” mesons carrying quark number two that have complex (CP-violating) bare masses and are coupled to quark pairs. Aside from the existence of these potentially observable new particles with masses of sev...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1998
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(98)00148-8