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Electric Dipole Moment Searches in Nuclei, Atoms, and Molecules

Electric Dipole Moment Searches in Nuclei, Atoms, and Molecules

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Electric Dipole Moment Searches in Nuclei, Atoms, and Molecules

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  1. S D Electric Dipole Moment Searches in Nuclei, Atoms, and Molecules Dave Kawall - RIKEN BNL Research Center and UMass RBRC Symposium, BNL, June 19th, 2006

  2. D S P T 2

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  5. e e x g P and CP-violating processes 5

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  9. Two Loop Contributions to EDMS in SUSY ( From D. Chang, W.Y. Keung, and A. Pilaftsis, Phys. Rev. Lett. 82, 900 (1999)) Rf = tan, F=two-loop function, =CP violating parameter 9

  10. Searching for new physics with the electron EDM Yale I (projected) Yale II (projected) Berkeley Naive SUSY Heavy sfermions Accidental Canc. Approx-CP Multi-Higgs Approx-Universality Alignment SO(10) GUT Exact-Universality Left-Right Symmetric Technicolor Standard Model Lepton Flavor Changing de (e·cm) 10-26 10-30 10-40 10-28 10-32 Experimental limit: |de| < 1.610-27 ecm (Berkeley) • de is a powerful probe for new physics • even a null result is interesting 10

  11. Algorithm for finding an EDM w B B E B E w w f f DE=2mB-2dE f DE=2mB DE=2mB+2dE • Put system with unpaired spin in parallel E and B fields • Spin polarize system perpendicular to fields (superposition of spin up and down) • Torques from E and B lead to precession through angle f in coherence time t • Flip E wrt B, look for change in f (i.e. look for energy shift) Torques Antiparallel Torques Parallel Spin Up Spin Down • Look for precession frequency shift Dn~4dE/h • For E=100 kV/cm, de=1 x 10-27e cm  Dn~20 nHz <--> DB ~ few x 10-14 G • Only works for neutral systems 11

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  14. LANL/SNS Neutron EDM Apparatus 14

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  18. Eext Pb+ Eint O– 19

  19. Concept is simple enough … • Picture of chamber, leads for oven, • RF, electrodes, PMT, B-field coils, … • View down lightpipe • EDM Cell with electrodes, guard rings 20

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  21. He Inlet Cold Plate<4K 4He PbO Photodiode Electrode Filter ExcitationPulse Ablation Pulse 22

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  23. IL BL 24

  24. Summary • No permanent EDM has been found in any system • There are good reasons to expect EDMs within range of new generation of experiments • Non-zero and null results both quite interesting • New experiments in different systems well underway • Stay tuned - next 2-5 years will be very interesting 25

  25. Thanks for your attention!