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Physics of Electric Dipole Moments in Storage Rings

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... D _at_ 10-29e cm most models beyond the SM predict values ... An Electron in a Neutral Atom Feels no Force Either: ...Otherwise it Would be Accelerated... – PowerPoint PPT presentation

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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

2
Particles with Spin
3
A Permanent EDM Violates both T P Symmetries
4
A Permanent EDM Violates both T P Symmetries
5
How about Induced EDMs?
6
MDMs 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.
8
EDM 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
9
Electric 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

10
EDM in an Electric Field
11
Precession of a Top in a Gravitational Field
12
Usual Experimental Method
13
Schiff TheoremA Charged Particle at Equilibrium
Feels no ForceAn Electron in a Neutral Atom
Feels no Force Either
Otherwise it Would be Accelerated
14
Neutron 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).
15
Schiff 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!
16
Current 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
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18
EDM 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
19
Future 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.

20
Neutron EDM at LANSCEAiming for a Factor of 50
21
Electric Dipole Moments in Storage Rings
  • e.g. 1T corresponds to 300 MV/m!
    Goal P _at_ 10-28ecm, D _at_ 10-29ecm

22
Hadronic EDMs
i.e. _at_ 10-29e?cm
23
A 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
24
Quark EM and Color EDMs
i.e. Deuterons and neutrons are sensitive to
different linear combination of quarks and
chromo-EDMs. Similarly with the proton.
25
Deuteron (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)

26
Sensitivity to right-handed ?? mass
27
Sensitivity to right-handed ?? mass
28
CEDMs for the down quark vs MN3
Deuteron sensitivityat 10-29 e?cm
29
Electric 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.

30
EDM 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.

31
Extra Slides
32
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33
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34
S. Lamoreaux at Lepton Moments
E5MV/m, T108s
RD
35
Cost of the n-EDM Experiment at LANSCE
  • 10M for the experimental apparatus
  • 9M for the Beamline
  • RD?
  • Total 19M plus RD
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