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Full-Text Articles in Physical Sciences and Mathematics
Chromoelectric Dipole Moment Of The Top Quark In Models With Vectorlike Multiplets, Tarek Ibrahim, Pran Nath
Chromoelectric Dipole Moment Of The Top Quark In Models With Vectorlike Multiplets, Tarek Ibrahim, Pran Nath
Pran Nath
The chromoelectric dipole moment of the top quark is calculated in a model with a vectorlike multiplet, which mixes with the third generation in an extension of the minimal supersymmetric standard model. Such mixings allow for new CP violating phases. Including these new CP phases, the chromoelectric dipole moment that generates an electric dipole of the top in this class of models is computed. The top chromoelectric dipole moment operator arises from loops involving the exchange of the W, the Z, as well as from the exchange involving the charginos, the neutralinos, the gluino, and the vectorlike multiplet and their …
Neutralino Exchange Corrections To The Higgs Boson Mixings With Explicit Cp Violation, Tarek Ibrahim, Pran Nath
Neutralino Exchange Corrections To The Higgs Boson Mixings With Explicit Cp Violation, Tarek Ibrahim, Pran Nath
Pran Nath
A calculus for the derivatives of the eigenvalues of the neutralino mass matrix with respect to the CP violating background fields is developed and used to compute the mixings among the CP even and the CP odd Higgs sectors arising from the inclusion of the neutralino sector consisting of the neutralino, the Z boson, and the neutral Higgs bosons (χi⁰-Z-h⁰-H⁰) exchange in the loop contribution to the effective potential including the effects of large CP violating phases. Along with the top squark, bottom squark, tau slepton and chargino–W–charged-Higgs-boson (χ⁺-W-H⁺) contributions computed previously the present analysis completes the one loop corrections …
Cp Violation Via Electroweak Guaginos And The Electric Dipole Moment Of The Electron, Pran Nath
Cp Violation Via Electroweak Guaginos And The Electric Dipole Moment Of The Electron, Pran Nath
Pran Nath
The effective Lagrangian which exhibits explicitly the transmission of the CP-violating phases induced via the electroweak gaugino masses below the scale of the spontaneous breaking of SU(2)L×Uy(1) electroweak gauge symmetry is deduced. The formalism is used to compute the one-loop electric dipole moment of the electron including the full set of neutralino states. Contributions of neutralinos other than the photino are found to be significant. It is shown that the current data excludes maximal CP violation in the electroweak sector except for selectron masses ≳200 GeV and photino masses ≳750 GeV
Cp Violation From Standard Model To Strings, Tarek Ibrahim, Pran Nath
Cp Violation From Standard Model To Strings, Tarek Ibrahim, Pran Nath
Pran Nath
A review of CP violation from the Standard Model to strings is given which includes a broad landscape of particle physics models, encompassing the non-supersymmetric 4D extensions of the standard model, and models based on supersymmetry, on extra dimensions, on strings and on branes. The supersymmetric models discussed include complex mSUGRA and its extensions, while the models based on extra dimensions include 5D models including models based on warped geometry. CP violation beyond the standard model is central to achieving the desired amount of baryon asymmetry in the universe via baryogenesis and leptogenesis. They also affect a variety of particle …