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Full-Text Articles in Physical Sciences and Mathematics
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 …
Suppression Of Higgsino Mediated Proton Decay By Cancellations In Grand Unified Theories And Strings, Pran Nath, Raza M. Syed
Suppression Of Higgsino Mediated Proton Decay By Cancellations In Grand Unified Theories And Strings, Pran Nath, Raza M. Syed
Pran Nath
A mechanism for the enhancement for proton lifetime in supersymmetric/supergravity (SUSY/SUGRA) grand unified theories and in string theory models is discussed where Higgsino mediated proton decay arising from color triplets (antitriplets) with charges Q=-1/3(1/3) and Q=-4/3(4/3) is suppressed by an internal cancellation due to contributions from different sources. We exhibit the mechanism for an SU(5) model with 45H+45̅H Higgs multiplets in addition to the usual Higgs structure of the minimal model. This model contains both Q=-1/3(1/3) and Q=-4/3(4/3) Higgs color triplets (antitriplets) and simple constraints allow for a complete suppression of Higgsino mediated proton decay. Suppression of proton decay in …