Scientists have been searching for a neutron EDM for more than 50 years.  The limit has improved by roughly an order of magnitude every eight years.  In turn, this continually adds limitations and constraints to new physical models. The image above shows some of the different theories disproved by these experiments. Although there are many orders of magnitude to go before these investiagtions can put serious constraints on the Standard Model, many other models -- including additional Higgs, various flavours of SUSY and so on -- should be within the grasp of the cryogenic EDM experiment, which is now under development.

Latest result: |d| < 3.0 E-26 e.cm.

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