Neutron and electron electric dipole moment in N=1 supergravity unification

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.57.478· OSTI ID:566143

Ibrahim, T; Nath, P ^[1]

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1. Department of Physics, Northeastern University, Boston, Massachusetts 02115 (United States)

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 gluonic parts lead to a dramatic lowering of the neutron EDM sometimes below the electron EDM value. This phenomenon gives a new mechanism, i.e., that of internal cancellations, for the suppression of the neutron EDM in supersymmetric theories. The cancellation mechanism can significantly reduce the severe fine-tuning problem associated with CP-violating phases in SUSY and SUGRA unified models. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 566143
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 1 Vol. 57; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHARGED PARTICLES
CP INVARIANCE
ELECTRIC DIPOLE MOMENTS
ELECTRONS
GLUONS
NEUTRAL PARTICLES
NEUTRONS
SPARTICLES
SUPERGRAVITY
SUPERSYMMETRY
UNIFIED GAUGE MODELS
VIOLATIONS