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Full-Text Articles in Physics
Top Quark Electric Dipole Moment In A Minimal Supersymmetric Standard Model Extension With Vectorlike Multiplets, Tarek Ibrahim, Pran Nath
Top Quark Electric Dipole Moment In A Minimal Supersymmetric Standard Model Extension With Vectorlike Multiplets, Tarek Ibrahim, Pran Nath
Pran Nath
The electric dipole moment (EDM) of the top quark is calculated in a model with a vector like 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 EDM of the top in this class of models is computed. The top EDM 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 vector like multiplet and their superpartners. The analysis of the EDM of …
Neutron And Electron Electric Dipole Moment In N=1 Supergravity Unification, Tarek Ibrahim, Pran Nath
Neutron And Electron Electric Dipole Moment In N=1 Supergravity Unification, Tarek Ibrahim, Pran Nath
Pran Nath
An analysis of the neutron EDM and of the electron EDM in minimal N=1 supergravity unification with two CP-violating phases is given. For the neutron the analysis includes the complete one loop gluino, chargino, and neutralino exchange diagrams for the electric dipole and the chromoelectric dipole operators, and also the contribution of the purely gluonic dimension-six operator. It is shown that there exist significant regions in the six-dimensional parameter space of the model where cancellations between the gluino and the chargino exchanges reduce the electric and the chromoelectric contributions, and further cancellations among the electric, the chromoelectric, and the purely …
Large Τ And Τ Neutrino Electric Dipole Moments In Models With Vectorlike Multiplets, Tarek Ibrahim, Pran Nath
Large Τ And Τ Neutrino Electric Dipole Moments In Models With Vectorlike Multiplets, Tarek Ibrahim, Pran Nath
Pran Nath
It is shown that the electric dipole moment of the τ lepton several orders of magnitude larger than predicted by the standard model can be generated from mixings in models with vectorlike mutiplets. The electric dipole moment (EDM) of the τ lepton arises from loops involving the exchange of the W, the charginos, the neutralinos, the sleptons, the mirror leptons, and the mirror sleptons. The EDM of the Dirac τ neutrino is also computed from loops involving the exchange of the W, the charginos, the mirror leptons, and the mirror sleptons. A numerical analysis is presented, and it is shown …
Neutron And Lepton Electric Dipole Moments In The Minimal Supersymmetric Standard Model, Large Cp Violating Phases, And The Cancellation Mechanism, Tarek Ibrahim, Pran Nath
Neutron And Lepton Electric Dipole Moments In The Minimal Supersymmetric Standard Model, Large Cp Violating Phases, And The Cancellation Mechanism, Tarek Ibrahim, Pran Nath
Pran Nath
An analysis of the electric dipole moment (EDM) of the neutron and of the lepton in the minimal supersymmetric standard model (MSSM) with the most general allowed set of CP violating phases without generational mixing is given. The analysis includes the contributions from the gluino, the chargino and the neutralino exchanges to the electric dipole operator, the chromoelectric dipole operator, and the CP violating purely gluonic dimension six operator. It is found that the EDMs depend only on certain combinations of the CP phases. The independent set of such phases is classified. The analysis of the EDMs given here provides …
Slepton Flavor Nonuniversality, The Muon Electric Dipole Moment, And Its Proposed Sensitive Search At Brookhaven, Tarek Ibrahim, Pran Nath
Slepton Flavor Nonuniversality, The Muon Electric Dipole Moment, And Its Proposed Sensitive Search At Brookhaven, Tarek Ibrahim, Pran Nath
Pran Nath
We analyze the electric dipole moment of the electron (dₑ), of the neutron (dn), and of the muon (dμ), using the cancellation mechanism in the presence of nonuniversalities of the soft breaking parameters. It is shown that the nonuniversalities in the slepton sector produce a strong violation of the scaling relation dμ/dₑ≃mμ/mₑ in the cancellation region. An analysis of dₑ, d,n, and dμ under the constraints of the current experimental limits on dₑ and dn, and under the constraints of the recent Brookhaven result on gμ-2, shows that in the nonscaling region, dμ can be as large as (10⁻2⁴-10⁻23)ecm and …