Electric dipole moment cancellations in D-brane models

Area of Science:

• Particle Physics
• Cosmology
• Beyond Standard Model Physics

Background:

• Electric dipole moments (EDMs) probe CP violation beyond the Standard Model.
• Supersymmetric theories, including mSUGRA and D-brane models, offer mechanisms for new CP violation.
• Simultaneous EDM cancellations are a stringent test of these theoretical frameworks.

Purpose of the Study:

• To analyze the viability of simultaneous electron, neutron, and mercury EDM cancellations.
• To constrain theoretical models like mSUGRA and D-brane models using EDM data.
• To explore the implications of current experimental limits on New Physics scenarios.

Main Methods:

• Theoretical analysis of EDM operators within mSUGRA and D-brane frameworks.
• Inclusion of contributions from various supersymmetric particles and interactions.
• Comparison of theoretical predictions with experimental upper limits on electron, neutron, and mercury EDMs.

Main Results:

• Mercury EDM constraints strongly disfavor simultaneous EDM cancellations in D-brane models.
• Simultaneous EDM cancellations are still permissible within mSUGRA, though requiring fine-tuning of parameters.
• The electron and neutron EDM constraints play a secondary role compared to the mercury EDM limit.

Conclusions:

• The stringent mercury EDM limit significantly restricts New Physics models.
• mSUGRA remains a viable framework for accommodating simultaneous EDM cancellations, albeit with fine-tuning.
• D-brane models face severe challenges in explaining simultaneous EDM cancellations under current experimental constraints.