COLLOQUIUM - The search for permanent electric dipole moments

Monday May 14th 2012, 12 pm - Seminar room

Speaker: Klaus Kirch (ETH Zürich – PSI-Villigen)

Abstract: Permanent electric dipole moments (EDM) of fundamental systems with spin like particles, nuclei, atoms or molecules violate parity and time reversal invariance.

Invoking the CPT theorem, time reversal violation implies CP violation. Although CP-violation is implemented in the standard electro-weak theory, EDM generated this way remain undetectably small. However, this CP-violation also appears to fail explaining the observed baryon asymmetry of our universe. Extensions of the standard theory usually include new sources of CP violation and often predict larger EDM among their observable signatures. EDM searches in different systems are complementary and various efforts worldwide are underway. No finite value could be established yet. The prototype of an EDM search is the one for the EDM of the neutron. It has the longest history and at the same time is at the forefront of present research. The talk aims at giving an overview of the field with emphasis on our efforts within an international collaboration at PSI, nedm.web.psi.ch.

 

 

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