Search for permanent electric dipole moments
This presentation is the property of its rightful owner.
Sponsored Links
1 / 72

Search for permanent Electric Dipole Moments PowerPoint PPT Presentation


  • 76 Views
  • Uploaded on
  • Presentation posted in: General

Autumn School & Workshop. Search for permanent Electric Dipole Moments. September 23, 2013 Frank Rathmann (on behalf of the JEDI collaboration ) Tbilisi, Georgia. Outline. Introduction Electric Dipole Moments

Download Presentation

Search for permanent Electric Dipole Moments

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Search for permanent electric dipole moments

Autumn School & Workshop

Search for permanent Electric Dipole Moments

September 23, 2013 Frank Rathmann

(on behalf oftheJEDIcollaboration)

Tbilisi, Georgia


Outline

Outline

  • Introduction

  • Electric Dipole Moments

  • Chargedparticle EDM searches

    • Concepts fordedicatedStorage Ring searches

    • Technological challenges

    • Precursor Experiments

  • News

  • Timeline

  • Conclusion

Search for permanent Electric Dipole Moments


Introduction the big challenges

Introduction: The bigchallenges

Conventional HEP wisdom, but there is more than that …

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Introduction: Physics Frontiers

Search for

theoriginof

mass („Higgs“),

SUSY

Secrets of

neutrinos

Energy

Intensity

Frontiers of

Physical

Sciences

Cosmic

Complexity

Quest for

„Dark Matter“

and

„Dark Energy“

Precision

(In-)stability

of the

proton

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Introduction: Precision Frontier

ESPP, Cracow,

September 2012

A most promising additional frontier: Precision

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Introduction: Precision Frontier

Example: Neutron (nEDM)

Adaptedfrom:

Nature,

Vol 482 (2012)

Search forElectric Dipole Moments (EDM) of fundamental particles

Search for permanent Electric Dipole Moments


Outline1

Outline

  • Introduction

  • Electric Dipole Moments

  • Chargedparticle EDM searches

    • Concepts fordedicatedStorage Ring searches

    • Technological challenges

    • Precursor Experiments

  • News

  • Timeline

  • Conclusion

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Physics: Fundamental Particles

Charge symmetricNoEDM ()

: MDM

: EDM

Do particles(e.g., electron, nucleon) have an EDM?

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

EDMs: DiscreteSymmetries

Not Charge symmetric

(aligned w/ spin)

Permanent EDMs violate P and T.

Assuming CPT to hold, CPviolated also.

Search for permanent Electric Dipole Moments


Physics what caused the baryon asymmetry

Physics:Whatcausedthe Baryon asymmetry?

Carina Nebula: Largest-seen star-birth regions in the galaxy

Whathappenedtothe antimatter?

Sakharov (1967): Three conditions for baryogenesis

B number conservation violated sufficiently strongly

C and CP violated, B and anti-Bs with different rates

Evolution of universe outside thermal equilibrium

The mysteryofthemissing antimatter (the puzzle ofourexistence)

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Physics: Potential of EDMs

J.M. Pendlebury: „nEDMhaskilledmoretheoriesthananyothersingleexpt.“

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Physics: Limits for Electric Dipole Moments

EDM searches– onlyupperlimitsyet(in )

Huge efforts underway worldwide to improve limits / find EDMs

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Physics: Ongoing/plannedSearches

new

P. Harris, K. Kirch … A huge worldwide effort

EDM searches at COSY: Overview of COSY plans and activities


Outline2

Outline

  • Introduction

  • Electric Dipole Moments

  • Chargedparticle EDM searches

    • Concepts fordedicatedStorage Ring searches

    • Technological challenges

    • Precursor Experiments

  • News

  • Timeline

  • Conclusion

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Principle: Frozen spin Method

Fortransverseelectricandmagneticfields in a ring ( ),

anomalousspin precession isdescribedbyThomas-BMT equation:

x

Magic condition: Spin alongmomentumvector

Foranysignof, in a combinedelectricandmagneticmachine

2. For(protons) in an all electric ring

(magic)

 Magic rings tomeasure EDMs offreechargeparticles

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Principle: Rings forsrEDMsearches

  • Place particles in a storage ring

  • Alignspinalongmomentum („Freeze“ horizontal spinprecession)

  • Search for time developmentofverticalpolarization

New Methodtomeasure EDMs offreechargedparticles:

Magic rings withspinfrozenalongmomentum

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

EDMs: Storage ring projects

pEDM in all electric ring at BNL

Jülich, focus on deuterons, or a combinedmachine

orat FNAL

(fromR. Talman)

CW and CCW propagatingbeams

(from A. Lehrach)

Twoprojects: US (BNL or FNAL) andEurope (FZJ)

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Beat systematics: BNL Proposal

2 beamssimultaneouslyrotating in an all electricring (cw, ccw)

CW & CCW beams cancels systematic effects

  • Status:

  • ApprovedBNL-Proposal

  • Submittedto DOE

  • Interest at FNAL!

  • Goal forprotons

Manytechnologicalchallengestobemet

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Principle: Magic Storage ring

A magicstorage ring forprotons (electrostatic), deuterons, …

B

Possible tomeasure, , usingONEmachinewithm

Search for permanent Electric Dipole Moments


Ccw ccw with magnetic field richard talmans concept for a j lich all in one machine

CCW & CCW withmagneticfield:Richard Talmansconceptfor a Jülich all-in-onemachine

Iron-free, current-only, magnetic bending, eliminates hysteresis

B

A

Configurationgeneratesclose-to-perfectverticalBfield

B

A

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Magic ring: Jülich all-in-onemachine(R. Talmansconcept)

B

Maximum achievablefieldofcoppermagnets T.

VerycompactmachinespossibleforsrEDMsearches

Search for permanent Electric Dipole Moments


Edms sensitivity reach

EDMs – Sensitivity Reach

EDM search in charged baryon (systems)

pEDM

dEDM

Adaptedfrom:

Nature,

Vol 482 (2012)

NodirectmeasurementsforprotonanddeuteronEDM yet !

Search for permanent Electric Dipole Moments


Outline3

Outline

  • Introduction

  • Electric Dipole Moments

  • Chargedparticle EDM searches

    • Concepts fordedicated Storage Ring Searches

    • Technological challenges

    • Precursor Experiments

  • News

  • Timeline

  • Conclusion

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

srEDMsearches: Technogicalchallenges

  • Chargedparticle EDM searchesrequiredevelopmentof a newclassof high-precisionmachineswithmainlyelectricfieldsforbendingandfocussing.

  • Other topics:

  • Electric fieldgradients

  • Spin coherence time

  • Continuous polarimetry

  • Beam positioning

  • Spin tracking

These issues must beaddressedexperimentallyatexistingfacilities

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Challenge: Electric field for magic rings

Rfieldonly

Challenge toproduce large electricfieldgradients

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Challenge: Niobium electrodes

DPP stainlesssteel

fine-grainNb

Show oneslide on JLAB data HV devices

large-grainNb

single-crystalNb

large-grainNb

Large-grainNbatplateseparationof a few cm yields ~20 MV/m

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Challenge: Electric field for magic rings

Electrostatic separatorsatTevatronusedtoavoidunwanted interactions

- electrodesmadefromstainlesssteel

L~2.5 m

Routine operationatspark/Year atMV/m

Fall 2013: Transfer ofseparatorunit plus equipmentfrom FNAL to Jülich

Need todevelopnewelectrodematerialsandsurfacetreatments

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

“spin closed orbit vector”

makes one turn

“spin tune”

if ║

ring

stable polarization

A

Challenge: Spin coherence time

Spin closedorbit

one particle with

magnetic moment

Search for permanent Electric Dipole Moments


Challenge spin coherence time

Challenge: Spin coherence time

Weusuallydon‘tworryaboutcoherenceofspinsalong

Polarization not affected!

Atinjection all

spinvectorsaligned (coherent)

After some time, spinvectorsget out ofphaseandfullypopulatethecone

Situation very different, whenyou deal withmachineswithfrozenspin.

Longitudinal polarizationvanishes!

Atinjection all spinvectorsaligned

Later, spinvectorsare out ofphase in the horizontal plane

In an EDM machine with frozen spin, observation time is limited.

Search for permanent Electric Dipole Moments


Challenge sct stimates n n nikolaev

Challenge:SCT stimates (N.N. Nikolaev)

Onesourceofspincoherencearerandomvariationsofthespin tune

due tothemomentumspread in the beam

and

israndomizedby e.g., electroncooling

Estimate:

Spin coherence time for deuterons may be 𝟏𝟎𝟎× larger than for protons

Search for permanent Electric Dipole Moments


Edm at cosy cooler synchrotron

EDM at COSY: COolerSYnchrotron

Cooler andstorage ring for(polarized)protonsanddeuterons

Phase space

cooledinternal &

extractedbeams

COSY

… the spin-physics machine

for hadron physics

… an ideal startingpoint

for a srEDMsearch

Injector cyclotron

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Challenge: First measurementof SCT

2011 Test measurementsat COSY

Polarimetry:

Spin coherence time:

from Ed Stephenson

and Greta Guidoboni

decoherence

time

oscillation

capture

Search for permanent Electric Dipole Moments


Challenge sct recent achievements

Challenge: SCT recentachievements

Resultfrom 2012 run

from Ed Stephenson (Indiana)

and Greta Guidoboni (Ferrara)

Excellentprogresstowardsthe SCT goalforpEDM:s

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Challenge: Polarimetry

Beam polarimetry atppm levelachievedfordeuteronbeams

Search for permanent Electric Dipole Moments


Outline4

Outline

  • Introduction

  • Electric Dipole Moments

  • Chargedparticle EDM searches

    • Concepts fordedicated Storage Ring Searches

    • Technological challenges

    • Precursor Experiments

  • News

  • Timeline

  • Conclusion

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Precursorexperiments: RF methods

Methodbased on makingspinprecession in machine resonant withorbitmotion

Twoways:

Use an RF devicethatoperates on someharmonicsofthespinprecessionfrequency

Operate ring on an imperfectionresonance

Useexistingmagneticmachinesforfirstdirect EDM measurements

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Precursorexperiments:

1. ResonanceMethodwith „magic“ RF Wien filter

Avoidscoherentbetatronoscillationsof beam.

Radial RF-E andvertical RF-B fieldstoobservespinrotation due to EDM.

Approach pursuedfor a firstdirectmeasurementat COSY.

 „Magic RF Wien Filter“no Lorentz force

Indirect EDM effect

Observable:

Accumulationofverticalpolarizationduringspincoherence time

RF E(B)-field

In-plane polarization

stored d

Polarimeter (dpelastic)

  • Statistical sensitivityfor in therange to rangepossible.

    • Alignmentandfieldstabilityof ring magnets

    • Imperfectionof RF-E(B) flipper

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Precursorexperiments:

1. ResonanceMethodfordeuteronsat COSY

Parameters: beam energy

assumed EDM

E-field

  • EDM effect accumulates in

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Precursorexperiments:

1. ResonanceMethodfordeuteronsat COSY

Parameters: beam energy

assumed EDM

E-field

EDM effectaccumulates in

Linear extrapolationoffortime periodofyields.

Search for permanent Electric Dipole Moments


Development rf e b flipper rf wien filter

Development: RF E/B-Flipper (RF Wien Filter)

Upgrade testflipperwithelectrostaticfieldplatesready end ofyear.

Buildlower power versionusing a striplinesystem

Build high-power versionofstriplinesystem ()

Work byS. Mey, R. Gebel (Jülich)

J. Slim, D. Hölscher (IHF RWTH Aachen)

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Precursorexperiments:

2. Resonant EDM measurementwithstaticWien Filter

Machineoperated on imperfectionspinresonanceat

withoutstatic WF

Spin rotation in phasewithorbitmotion

Similaraccumulationof EDM signal, systematicsmoredifficult, strengthofimperfectionresonance must besuppressedbyclosed-orbit corrections.

Search for permanent Electric Dipole Moments


Outline5

Outline

  • Introduction

  • Electric Dipole Moments

  • Chargedparticle EDM searches

    • Concepts fordedicated Storage Ring Searches

    • Technological challenges

    • Precursor Experiments

  • News

  • Timeline

  • Conclusion

Search for permanent Electric Dipole Moments


New edm collaboration established

New EDM collaborationestablished

May theforcebewithus!

In 2012, JEDIcollaborationfounded (members)

Jülich ElectricDipole Moment Investigations

Spokespersons: Andreas Lehrach (Jülich)

Jörg Pretz (RWTH Aachen)

F.R. (Jülich)

Search for permanent Electric Dipole Moments


Outline6

Outline

  • Introduction

  • Electric Dipole Moments

  • Chargedparticle EDM searches

    • Concepts fordedicated Storage Ring Searches

    • Technological challenges

    • Precursor Experiments

  • News

  • Timeline

  • Conclusion

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Timeline:

Stepwiseapproachall-in-onemachineforJEDI

Time scale:Steps1 and 2: years (i.e., in POF 3)

Steps3 and 4: years

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

Conclusion

  • Measurements of EDMs extremelydifficult, but fantasticphysicsreach

  • Twostorage ring projects

    • BNL all-electricmachineatmagicmomentum ()

    • Jülich all-in-onemachineconcept (, , )

  • Pursue SCT investigationsat COSY

  • VerygoodprospectsforfirstdirectEDM measurementsofandat COSYusingresonancemethodsbased on RF E(B)–fields

  • JEDIcollaborationestablished:

  • Collaborations workjointly on technologicalchallenges:

    • Polarimetry, SCT, E-fieldgeneration, BPMs, etc

  • Strong needfor high precisionspintrackingtools, incl. RF structures

  • Electrostaticdeflectordevelopmentusing FNAL equipment

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

“Man mußetwasNeuesmachen, um etwasNeueszusehen.”

“You have to make (create) something new,

if you want to see something new”

Georg Christoph Lichtenberg (1742-1799)

Search for permanent Electric Dipole Moments


Spares

Spares

Search for permanent Electric Dipole Moments


Physics potential of edms

Physics: Potential of EDMs

N. Arkani-Hamed (IAS, Princeton) atIntensityFrontier WS, USA (2011)

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

EDMs: Whyis CPV so interesting?

  • CPV in the SM points to physics we do not understand

  • CPV is highly sensitive to physics beyond the SM (New Physics)

  • CPV is accessible to a wide range of experiments

  • New source of CPV beyond the SM required for baryogenesis

Physicsbeyondthe Standard Model (BSM)

Search for permanent Electric Dipole Moments


Search for permanent electric dipole moments

srEDM cooperations

International srEDM Network

Institutional (MoU) and Personal (Spokespersons …) Cooperation, Coordination

srEDMCollaboration (BNL)

(spokespersonYannisSemertzidis)

JEDI Collaboration (FZJ)(spokespersons: A. Lehrach, J. Pretz, F.R.)

  • Common R&D

    • RHICEDM-at-COSY

  • Beam Position Monitors Polarimetry

  • (…) Spin Coherence Time

  • Cooling

  • Spin Tracking (…)

  • Study Group

    First directmeasurement

    Ring Design

    DOE-Proposal(submitted)

    CD0, 1, …

    HGF Application(s)

    pEDM Ring at BNL

    JEDI

    Search for permanent Electric Dipole Moments


    M agnetic moment spin g and g

    Magneticmoment, spin, g and G

    Nuclearmagneton

    Search for permanent Electric Dipole Moments


    Operation of magic rf wien filter

    Operation of „magic“ RF Wien filter

    Radial E andvertical B fieldsoscillate, e.g., with(here).

    beam energy

    Spin coherence time maydepend on excitationand on chosenharmonics

    Search for permanent Electric Dipole Moments


    Search for permanent electric dipole moments

    Simulation ofresonanceMethod

    with Magic Wien filterfordeuteronsat COSY

    Parameters: beam energy

    assumed EDM

    E-field

    Linear extrapolationoffor a time periodof.

    EDM effectaccumulates in

    Search for permanent Electric Dipole Moments


    Search for permanent electric dipole moments

    Why also EDMs of protons and deuterons?

    Proton anddeuteron EDM experimentsmayprovideone order highersensitivity.

    In particularthedeuteronmayprovide a muchhighersensitivitythanprotons.

    • Consensus in the theoretical community:

    • Essential to perform EDM measurements on different targets with similar sensitivity:

    • unfold the underlying physics,

    • explain the baryogenesis.

    Search for permanent Electric Dipole Moments


    Search for permanent electric dipole moments

    Magic condition: Protons

    Case 2: and fields

    magicenergy

    magicenergy

    Search for permanent Electric Dipole Moments


    Search for permanent electric dipole moments

    Magic condition: Deuterons

    and fields

    Search for permanent Electric Dipole Moments


    Search for permanent electric dipole moments

    Magic condition: Helions

    and fields

    Search for permanent Electric Dipole Moments


    Some polarimetry issues

    Some polarimetry issues

    • srEDMexperimentsusefrozenspinmode, i.e., beam mostlypolarizedalongdirectionofmotion,

    • most promising ring optionsusecw & ccwbeams.

    • scattering on C destructive on beam andphase-space,

    • scatteringon C determinespolarizationofmainlyparticleswith large betatron amplitudes, and

    • is not capabletodetermine .

    • Forelasticscattering longitudinal analyzingpowersaretiny (violatesparity).

    Ideally, use a methodthatwoulddetermine.

    pCanddC polarimetry isthecurrentlyfavoredapproachforthepEDMexperimentat BNL

    Search for permanent Electric Dipole Moments


    Exploit observables that depend on beam and target polarization

    Exploit observables thatdepend onbeam andtargetpolarization

    Spin-dependent differential crosssectionfor

    Analyzing power

    Spin correlations

    In scattering, necessary observables are well-knownin therangeMeV (not so foror).

    Search for permanent Electric Dipole Moments


    How could one do that determine

    How couldone do that, determine?

    Detector

    CW

    CCW

    cell

    • Detector determinesofcw & ccwbeamsseparately, based on kinematics.

    • Alignmentoftargetpolarization along axesbymagneticfields. Leads tounwanted MDM rotations absolute no-goin EDM experiments.

    Suggestion 1: Use a polarizedstoragecelltarget

    Search for permanent Electric Dipole Moments


    How could one do that determine1

    How couldone do that, determine?

    Detector

    Polarizedionsource(~10 MeV)

    • Collidetwoexternalbeamswithcwandccwstoredbeams.

    • Energycouldbetunedtomatchdetectoracceptance.

    • Polarizationcomponentsofprobinglow-energy beam canbemadelarge, wouldbeselectedbyspinrotators in thetransmissionlines.

    • Luminosityestimatesnecessary

    Suggestion 2: Usecolliding beam fromexternalsource

    Search for permanent Electric Dipole Moments


    How could one do that determine2

    How couldone do that, determine?

    Detector

    CW

    CCW

    • Requiresluminosity, -functionsat IP shouldberathersmall.

    • Advantage oversuggestion 2. isthatsupportsluminosity.

    • Disadvantageisthatsensitivitycomesmainlyfromtermswithand.

    • Detailedestimatesnecessary.

    Suggestion 3: Usedirectlyreactionsfromcollidingbeams

    Search for permanent Electric Dipole Moments


    Luminosity estimate for the collider option

    Luminosityestimateforthecollideroption

    Conditions:

    Even undertheseveryoptimisticassumptions, event rate will beratherlow.

    Search for permanent Electric Dipole Moments


    Symmetries

    Symmetries

    Physical laws are invariant under certain transformations.

    • T-Symmetry:

    C-parity(or Charge parity):

    • Changessignof all quantizedcharges

    • electrical charge,

    • baryon number,

    • lepton number,

    • flavor charges,

    • Isospin (3rd-component)

    Parity:

    Search for permanent Electric Dipole Moments


    New idea ivan koop s spin wheel

    New Idea: Ivan Koop‘sspin-wheel

    B

    By appropriatechoiceofmagneticfield, thespinvectorrotates fast frequenciesoftheorder kHz

    Jülich hasexpertise in SQUIDs, peoplesay, state-of-theartmeasurementsallowforis (

    This wouldrevolutionizethewayweconceive EDM (and in generalpolarization) experiments, becausefrequenciesbecomedirectlymeasureable.

    Search for permanent Electric Dipole Moments


    How this would work

    Howthiswouldwork?

    Frequency

    Find thevalueof B where

    spinprecessionfrequencydisappears

    B field

    Search for permanent Electric Dipole Moments


    Squids precision tools for accelerators

    SQUIDs: Precision tools for accelerators

    • Possibleapplications in accelerators, all ofwhichareneededforsrEDMexperiments

      • Beam currenttransformers

      • Beam positionmonitors

      • Beam polarimeters

    • Begin developmentwith a measurementofthenoisespectrum using three coils:

      • Coil 35mm away from center ANKE chamber

      • Combined coils in same housing

        • GHz range (one pickup loop)

        • MHz range (several hundered loops)

      • Fluxgate sensor

        • kHz range

    Measurement ofnoisespectrumat COSY in MD week, July 2013

    Search for permanent Electric Dipole Moments


    New idea direct measurement of electron edm

    New Idea: Directmeasurementofelectron EDM

    • Bill Morse: , , (talktomorrow)

    • Nobody knowswhere CPV ishiding, maywellbe in theleptonicsector

    • Needs a dedicated R&D effort

    • Veryattractive:

      • Tests all ingredientsofsrEDMexperiments

      • Coulddevelopinto a long-term project

    • Polarimetry is an issue

    • Goal:

    Couldbe an optionfor FNAL usingtheelectrostatic Tevatron separators

    Search for permanent Electric Dipole Moments


    Projects and persons

    Projects andpersons

    Accelerator

    Systematicerrorstudies

    Search for permanent Electric Dipole Moments


    Projects and persons1

    Projects andpersons

    RF E/B flipper

    B fieldmeasurement

    Electrostaticdeflectors

    Polarimetry

    Search for permanent Electric Dipole Moments


    Events in 2013

    Events in 2013

    • JARA-FAME kick-offJanuary17, 2013

      • newpillarof Jülich-Aachen Research Alliance

      • Samuel C. C. Ting on AMS-Experiment at ISS

    • JEDI collaborationmeetingMarch 13-14, 2013

    • Ferrara International School NiccolòCabeo2013

      Physicsbeyondthestandardmodel:The precisionfrontierMay, 20-24 2013, IUSS, Ferrara (Italy)

    • Opportunities for Polarized Physics at Fermilab

      May 20-22, 2013, Fermilab, USA

    Search for permanent Electric Dipole Moments


  • Login