Title: Physics of Electric Dipole Moments in Storage Rings
1 Physics of Electric Dipole Moments in Storage
Rings
Frascati, 3 October 2005
- Yannis K. Semertzidis
- Brookhaven National Lab
- EDMs What do they probe?
- Experimental Technique
- Physics of Hadronic EDMs
2Particles with Spin
3A Permanent EDM Violates both T P Symmetries
4A Permanent EDM Violates both T P Symmetries
5How about Induced EDMs?
6MDMs are Allowed
7 Andrei Sakharov 1967 CP-Violation
is one of three conditions to enable a universe
containing initially equal amounts of matter and
antimatter to evolve into a matter-dominated
universe, which we see today.
8EDM Searches are Excellent Probes of Physics
Beyond the SM
- One CP-Violating Phase (CKM), Needs loops
with all quark families for a non-zero result
(High Order Effect). Predicts negligible values.
SM
42 CP-Violating Phases, Needs one loop for
a non-zero result (First Order Effect).
SUSY
9Electric Dipole Moments in Storage Rings
- For P _at_ 10-28ecm, D _at_ 10-29ecm most models
beyond the SM predict values within our
sensitivity - SUSY
- Multi-Higgs
- Left-Right Symmetric
10EDM in an Electric Field
11Precession of a Top in a Gravitational Field
12Usual Experimental Method
13Schiff TheoremA Charged Particle at Equilibrium
Feels no ForceAn Electron in a Neutral Atom
Feels no Force Either
Otherwise it Would be Accelerated
14Neutron EDM Vs Year
at 6 x 10-26 e cm, it is analogous to the
Earth's surface being smooth and symmetric to
less than 1 µm (John Ellis).
15Schiff TheoremA Charged Particle at Equilibrium
Feels no ForceAn Electron in a Neutral Atom
Feels no Force Either. However
the net E-field is not zero!
16Current Atomic EDM Limits
- Paramagnetic Atoms, 205Tl electron
de lt 1.6?10-27ecm (90CL) - PRL 88, 071805 (2002)
- Diamagnetic Atoms, 199Hg Nucleus
d(199Hg) lt 2.1?10-28ecm (95CL) - PRL 86, 2505 (2001)
17(No Transcript)
18EDM Status
Particle System Limit e?cm
Electron 205Tl 1.5?10-27
Mercury 199Hg atom 2?10-28
Neutron Ultra-Cold n 5?10-26
Proton 199Hg atom 5?10-24
19Future Prospects
- Neutron Ultra-Cold Neutrons Polarized 3He
stored together in a superfluid 4He. Goal
50-1000, S.K. Lamoreaux et al. - Electron YbF Ultra-cold molecules. Goal 1000,
B.E. Sauer et al. - Electron PbO, goal 1000, D. DeMille et al.
20Neutron EDM at LANSCEAiming for a Factor of 50
21Electric Dipole Moments in Storage Rings
-
- e.g. 1T corresponds to 300 MV/m!
Goal P _at_ 10-28ecm, D _at_ 10-29ecm
22Hadronic EDMs
i.e. _at_ 10-29e?cm
23A value of ?QCD 10-13 would create an EDM of
System EDM value
Proton ?4?10-29e?cm
Neutron ?-3?10-29e?cm
Deuteron ?1?10-29e?cm
Tl atom ?5?10-31e?cm
Hg atom ?1?10-32e?cm
24Quark EM and Color EDMs
i.e. Deuterons and neutrons are sensitive to
different linear combination of quarks and
chromo-EDMs. Similarly with the proton.
25Deuteron (D) EDM at 3?10-27e?cm
D EDM at 10-29e?cm
- Relative strength of various EDM limits as a
function of left handed down squark mass (O.
Lebedev, K. Olive, M. Pospelov and A. Ritz, PRD
70, 016003 (2004) hep-ph/0402023)
26Sensitivity to right-handed ?? mass
27Sensitivity to right-handed ?? mass
28CEDMs for the down quark vs MN3
Deuteron sensitivityat 10-29 e?cm
29Electric Dipole Moments in Storage Rings
- P _at_ 10-28ecm, D _at_ 10-29ecm would be the best
EDM sensitivity over present or planned
experiments for ?QCD, quark, and quark-chromo
(T-odd Nuclear Forces) EDMs. - P, D, 3He, etc., i.e. a facility to pin down the
CP-violation source.
30EDM in Storage Rings
- STORI05 Nuclear Physics in Storage Rings
workshop, Bonn/Germany, May 2005 - Frascati/Rome, workshop dedicated to EDM in
Storage Rings, 1-11 October, 2005 - Flavour in the Era of the LHC, EDM
presentation, 7-11 November, 2005 - Letter of Intent on the resonance method by the
end of 2005.
31Extra Slides
32(No Transcript)
33(No Transcript)
34S. Lamoreaux at Lepton Moments
E5MV/m, T108s
RD
35Cost of the n-EDM Experiment at LANSCE
- 10M for the experimental apparatus
- 9M for the Beamline
- RD?
- Total 19M plus RD