e lectric d ipole m oments of fundamental particles
DESCRIPTION
SIGHAD03 Pisa, 8-10 October 2003. E lectric D ipole M oments of Fundamental Particles. Yannis K. Semertzidis Brookhaven National Lab. Motivation Experimental Techniques Prospects New Method Summary. +. T. -. +. -. P. -. +. A Permanent EDM Violates both T & P Symmetries:. - PowerPoint PPT PresentationTRANSCRIPT
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Electric Dipole Moments of Fundamental Particles
Yannis K. SemertzidisBrookhaven National Lab
SIGHAD03Pisa, 8-10 October 2003
•Motivation•Experimental Techniques•Prospects•New Method•Summary
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A Permanent EDM Violates both T & P Symmetries:
+
-
T-Violation CP-Violation(Could Explain Matter-Antimatter Asymmetry of Universe)
+
-
+
-T
P
CPT
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EDM Searches are Excellent Probes of Physics Beyond the SM:
1. One CP-Violating Phase (CKM), Needs loops with all quark families for a non-zero result (Third Order Effect).
2. No Coupling to r.h. Fermions
SM:
1. 42 CP-Violating Phases, Needs one loop for a non-zero result (First Order Effect).
2. There is Coupling to r.h. Fermions
SUSY:
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la Fortson
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Current EDM Limits
• Neutron: n (-7.0<dn<5.0)10-26e·cm (90%CL) PRL 82, 904 (1999)
• Paramagnetic Atoms or Molecules, 205Tl: electron |de| < 1.610-27e·cm (90%CL)
PRL 88, 071805 (2002)
• Diamagnetic Atoms, 199Hg: |d(199Hg)| < 2.110-28e·cm (95%CL)
PRL 86, 2505 (2001)
“More Theoretical Models have been killed by the EDM Experiments than any other Experimental Method”
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EdBdtsd
Experimental Methods
+-
Small Signal
Carrier Signal
Compare the Zeeman FrequenciesWhen E-field is Flipped:
dE421
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la Fortson
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la Fortson
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la Fortson
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d(muon) < 710-19
Left-Right
10-20
10-22
10-24
d e.cm
MultiHiggs SUSY
Electro-magnetic
neutron:electron:
1960 1970 1980 1990 2000 2010 2020 2030
10-28
10-29
Current status of EDMs
d(electron) < 1.6 10-
27
d(neutron) < 6 10-
26
d(proton) < 6 10-23
la Sauer
d(199Hg) < 2.1 10-28
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Future Prospects:
• Neutron: Ultra-Cold Neutrons & Polarized 3He stored together in a superfluid 4He. 100-1000 within 5-years, S.K. Lamoreaux et al.
• Electron: YbF Ultra-cold molecules. ~1000 within ~5-years, B.E. Sauer et al.
• Electron: PbO*, ~1000 within 3-years, ~10 within 1-year, D. DeMille et al.
It’s a Horse Race!
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Where is the EDM?
• Neutron?
• Electron?
• Muon (2nd Generation)?
• T-odd Nuclear Forces (199Hg)?
We don’t Know!
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Muon and Deuteron Electric Dipole Moments in Storage Rings
• Revolutionary New Way of Probing EDMs.
EdBdtsd
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Spin Precession in g-2 Ring(Top View)
Bmeaa
Momentumvector
Spin vector
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Spin Precession in EDM Ring(Top View)
0a
Momentumvector
Spin vector
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The muon spin precesses vertically (Side View)
BVdEddtsd
B
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The muon spin precesses vertically (Side View)
BVdEddtsd
B
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Radial E-field to Cancel the g-2 Precession
• Radial E-Field: 2aBcER
The method works well for particles with small anomalous magnetic moment a, e.g. Muons (a = 0.0011), Deuterons (a = -0.143), etc.
cEaBa
me
a
11
2
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Predictions in Specific Models
The predicted value for the electron is 10 times lessthan the current experimental limit.
50 effect at 10-24 ecm Exp. Sensitivity!
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Parameter Values of Muon EDM Experiment
• Radial E-Field:• E=2MV/m• Dipole B-field: B ~ 0.25T , R ~ 10m• Muon Momentum:
• Need NP2=1016 for 10-24e.cm. Muon EDM LOI: (http://www.bnl.gov/edm) to J-PARC, <one year of running.
• F. Farley et al., hep-ex/0307006
2aBcE
5 MeV/c,500 P
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Deuteron EDM Signal:
• Radial E-Field:
Rd
R
EadaBdc
BcEddtsd
1
,2 aBcaBcER for γ~1
e.g. for ER = 3.5MV/m, d = 10-27e·cm; ωd = 0.4µrad/s
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Sources of Deuteron Systematic Errors:
• Out of Plane Electric Field
• Tensor Polarization (not a Problem-Smaller is Better)
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Effect of Vertical Component of E0)( vv ruBEeF
cE
uEBr
vv
cEB
cEBB
cEBcBEE
Bmeg
zr
zrr
zrrzz
r
**
*
*
0
2
EcE
meg
cE
meg
22
v
22
• Deuterons β=0.2, γ=1.02, ω=13105 θE rad/s
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Effect of Vertical Component of E• Clock Wise and Counter-Clock Wise Injection:
Background: Same Sign Signal: Opposite Sign
• Protons β=0.15, γ=1.01, ω=115105 θE rad/s• Deuterons β=0.2, γ=1.02, ω= 13105 θE rad/s• Muons β=0.98, γ=5, ω= 2105 θE rad/s
• Other Diagnostics Include Injecting Forward vs Backward Polarized Beams as well as Radially Pol.
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Parameter Values of a Deuteron EDM Experiment
• Radial E-Field:
ER=3.5MV/m
• Dipole B-field: B~0.13T; Ring Radius: R~32m
• Deuteron Momentum:• YkS et al., hep/ex-0308063
2aBcER
5.0 GeV/c, 1 dP
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Deuteron Statistical Error:
TotcRpd fTNAPaE
a2
2
15.6
p : Polarization Lifetime (Coherence Time)A : The left/right asymmetry observed by the polarimeterP : The beam polarizationNc : The total number of stored particles per cycleTTot: Total running timef : Useful event rate fractionER : Radial electric field
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Coherence Time Limitations:• E, B field stability
• Multipoles of E, B fields
• Vertical (Pitch) and Horizontal Oscillations
• Finite Momentum Acceptance ΔP/P
At this time we believe we can do p~3s
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Deuteron Statistical Error:
TotcRpd fTNAPaE
a2
2
15.6
p : 3s. Polarization Lifetime (Coherence Time)A : 0.3. The left/right asymmetry observed by the polarimeterP : 0.55. The beam polarizationNc : 1011d/cycle. The total number of stored particles per cycleTTot: 107s. Total running timef : 0.1. Useful event rate fractionER : 3.5MV/m. Radial electric field
cme103 28 d
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Possible Locations for a Deuteron EDM Experiment:• Brookhaven National Laboratory
• KVI/The Netherlands
• Indiana University Cyclotron Facility
Proposal Early Next Year…
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Deuteron EDM to 10-27 ecm Sensitivity Level is 100 times better than 199Hg
• T-odd Nuclear Forces: dd =210-22 ξ e·cm with the best limit for ξ<0.5 10-3 coming from the 199Hg EDM limit (Fortson, et al., PRL 2001), i.e. dd < 10-25 e·cm.
(Sushkov, Flambaum, Khriplovich Sov. Phys. JETP, 60, p. 873 (1984) and Khriplovich and Korkin, Nucl. Phys. A665, p. 365 (2000)).
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dd = dp + dn (I. Khriplovich)
It Improves the Current Proton EDM Limit by a Factor of ~100,000 and a Factor 60-100 on Neutron.
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Possible Improvements:
• Higher ER Fields: 14MV/m with gas to slow down free electrons.
• Longer Storage Time than 3s while Maintaining Polarization (Coherence Time).
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We Need to Study
• Target and Polarimetry (deuteron case)
• E-field Directional Stability
• Beam and Spin Dynamics
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Electric Dipole Moment Searches:
• Exciting Physics, Forefront of SUSY Search.
• Revolutionary New Way of Probing EDMs.
• Sensitive EDM Experiments will bring the Next Breakthrough in Elementary Particle Physics.
Summary