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Friday, April 6, 2007
Physics Building, Room 204
Note special time.
[Host: Simonetta Liuti]
"A New Search on Neutron Electric Dipole Moment"
A new experiment is being planned to search for the neutron
Electric Dipole Moment (EDM) with an unprecedented sensitivity. The proposed
search aims at a two orders of magnitude improvement over
the current experimental limit. A search for a
non-zero value of the neutron EDM is a direct search of the time reversal
symmetry (T) violation. It provides a unique insight into
CP violation because of the CPT theorem. The Standard Model (SM)
prediction for the neutron EDM is below the current experimental limit by six
orders of magnitude. However, many proposed models of electroweak
interaction which are extensions beyond the SM predict much larger
values of neutron EDM. The new experiment has the potential to reduce the
acceptable range of predictions by two orders of magnitude.
Furthermore, if new sources of CP violation are present in nature
beyond the Standard Model and are relevant to hadronic systems,
this experiment offers a
unique opportunity to measure a non-zero value of neutron EDM. The current
understanding of the baryogenesis suggests that other sources of CP violation
might exist in nature beyond the Standard Model and beyond what have been
observed so far. To explain the baryon number asymmetry in the universe through
the grand unified theory or electroweak baryogenesis, substantial New Physics
in the CP violation sector is required. In this talk, I will discuss this new
experiment following a brief review of previous neutron EDM experiments.
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