Organized by Users Group and Sponsored by JLab and JSA

1

EIC JLab users workshops: An update Organized by Users Group and Sponsored by JLab and JSA Initiative

funds

Mee%ngsdiscussingvariousEICop%onshavebeengoingonforoveradecade

2007LongRangePlan:

We recommend the allocation of resources to develop accelerator and detector technology necessary to lay the foundation for a polarized electron-ion Collider. The EIC would explore the new QCD frontier of strong color fields in nuclei and precisely image the gluons in the proton.

Naturalinterest,butlimitedinvolvementofJLabusers,incollidereA+eNprogram

Expected2012(?)LRP

JLabUGBoDdecidestotrytohelp“kick‐start”greateruserinvolvementbysponsoringseriesofworkshops12‐GeVupgradeunderway,

“2013”start6/9/11 JLab Users Meeting 2011, Newport News, VA

Z.‐E.Meziani

6/9/11 JLab Users Meeting 2011, Newport News, VA 2

JLab:makingsenseoutofhadronsandnuclei

Swimmingagainstthecurrentlikesalmontoreturntotheorigin

 What is the internal spin and flavor landscape of hadrons?

 What is the role of gluons and gluons self interactions in nucleon and nuclei?

 What governs the transition of quarks and gluons into pions and nucleons?

Some of the NSAC LRP Overarching QCD questions

(December 2007)


The Tools

GPDsandTMDsinNucleiExclusiveSemi‐inclusiveIni%alandfinalmediumeffects

InclusiveSumrulesandpolarizabili%es

GeneralizedPartonDistribu%ons

Exclusivereac%ons

Elas%cformfactorsDeepVirtualCompton

ScaaeringDeepVirtualMeson

Produc%on

TransverseMomentumDistribu%ons

Semi‐InclusiveDIS

Distribu%onsandFragmenta%onfunc%ons

ElectroweakPhysics/probeBeyondthestandard

Model/oraprobetohadronicsystems

QCD

6/9/11 JLab Users Meeting 2011, Newport News, VA

Since1998 Since2002

4

Why mEIC/ELIC?

 Anaturalextensionofthe12GeVphysicsprogramofhadronstructureinfreespaceandinnuclei/QCD

However,theemphasisisnotthevalencequarksbutgluonsandseaquarksinthevalenceregionandbeyond

 Thisrequireshighluminosityandadequatecenterofmassenergy➥ Luminosityiskeyforprobingthesystemusingknownprocesses

withhigherprecisionorexploringrareprocesses➥ Energyreachkeyforprovidingacleaninterpreta%onthrough

rigoroustestsinsomecase


Workshops   StudygrouponHadronicPhysics

•  Nucleonspinandquark‐gluoncorrela%ons:Transversespin,quarkandgluonorbitalmo%on,semi‐inclusiveprocesses(PartonicTransverseMomentuminHadrons:QuarkSpin‐OrbitCorrela%onsandQuarkGluonsInterac%ons:workshopatDukeU.,March12‐13,2010)

H.Gaoetal.hap://michael.tunl.duke.edu/workshop•  3Dmappingoftheglueandseaquarksinthenucleon

(Electron‐NucleonExclusiveReac%ons:workshopatRutgersU.,March14‐15,2010)R.Gilmanetal.hap://www.physics.rutgers.edu/np/2010rueic‐home.html

  StudygrouponNuclearPhysics•  3Dtomographyofnuclei,quark/gluonpropaga%onandthegluon/seaquarkEMCeffect

(EICNuclearChromodynamics:workshopatArgonneNa%onalLab,April7‐9,2010)K.Hafidietal.hap://www.phy.anl.gov/mep/EIC‐NUC2010/

  StudygrouponElectroweakPhysics•  ElectroweakstructureofthenucleonandtestsoftheStandardModel

(workshopattheCollegeofW&M,May17‐18,2010)K.Kumaretal.haps://eic.jlab.org/wiki/index.php/Electroweak_Working_Group

  Studygrouponinterac%onregionanddetectors•  EICDetectors/Instrumenta%on

(workshopatJLab,June03‐04,2010)C.Hydeetal.hap://conferences.jlab.org/eic2010/program.html



Rutgers University / Jefferson Lab Electron-Ion Collider Workshop: Electron-

Nucleon Exclusive Reactions


OrganizingCommi,ee:RonaldGilman(Rutgers)TanjaHorn(CatholicUniversity)PawelNadel‐Turonski(JLab)Chris%anWeiss(JLab)

hap://www.int.washington.edu/PROGRAMS/12‐49w/

OrbitalAngularMomentuminQCD(12‐49W)February6‐17,2012L.C.Bland,Z‐E.Meziani,G.A.Miller,M.Vanderhaeghen,C.Weiss,F.Yuan

Afollowmini‐workshopattheINT

Tool:GeneralisedPartonDistribu%ons

Generalizeddescrip%onin2+1dimensions

ValencequarkimagingofthenucleonisonegoalofJLabat12GeV.

• Gluonimagingiss%llmissing

• SeaQuarksimagingisalsomissing

• TotalSpinofthenucleonintermsofallofitscons%tuents.

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3‐Dquarkimagingofthenucleon


Nucleon Angular Momentum

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JiSumrule(1997)

SpinofquarksContribu%on:MeasuredinDIS

Orbitalangularmomentumofquarks:InputfromLapceandmeasurementsatJLab12GeV

Totalangularmomentumofgluons


➥  ThroughthemomentumsumruleandHERADVMPwithJ/PsidatawehaveaglimpseonGPDHg

➥  NothingisknownaboutGPDEg

6/9/11 11JLab Users Meeting 2011, Newport News, VA

!!!!γ

J/ψ

!"""""

"#!""

""""#

PeterKroll

“My“ Golden Experimental Program

!"#"$$% $&%JLab Users Meeting 2011, Newport News, VA!

!!!!γ

J/ψ

!"""""

"#!""

""""#

  GlueimagingusingunpolarizedtargetsandaccessinggluonGPDHthroughexclusivemesonproduc%oninthevalenceregion

  TransverselypolarizednucleontoaccessgluonGPDEandtheSpinSumRule.


0.2 0.4 0.6 0.8 1.0

0.02

0.04

0.06

0.08

0.10

−t [GeV2]

AUT (J/Ψ)

black: δe = 0.0, α′e = 0.25

√s = 55 GeV

blue: δe = −0.1 + ln (mc/GeV), α′e = 0.45

magenta: δe = 0.1, α′e = 0.15

AUT (Υ) nearly twice as largePK 13

Duke/JLab Workshop on Partonic Transverse Momentum in Hadrons: Quark Spin-Orbit Correlations and Quark-Gluon Interactions, March

2010

Workshopsummarypaper:M.Anselminoetal.EPJA47,35(2011)

6/9/11 13JLab Users Meeting 2011, Newport News, VA

Quark/

Nucleon

Quarkpolariza<on

Un‐Polarized LongitudinallyPolarized TransverselyPolarized

Nucleon

Polariza%

on

U

L

T

Transverse Spin Structure: Leading Twist TMDs


f1T⊥=

f1=

g1=

g1T⊥=

h1L⊥=

h1⊥=

h1T=

h1T⊥=

NucleonSpin

QuarkSpin

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Transversity and the Tensor Charge   Quarktransversepolariza%oninatransverselypolarized

nucleon:

➥  CanbeprobedinSemi‐InclusiveDIS,Drell‐Yanprocesses.

➥ Doesnotmixwithgluons,hasvalencelikebehavior.

➥ Nucleontensorchargecanbeextractedfromthelowestmomentofh1andcomparedtoLQCDcalcula%ons


NucleonSpinQuarkSpin

h1T=

〈PSψ̄σµνψPS〉 =∫ 1

0dx [δq(x) − δq̄(x)]

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TensorCharge

Projections with 3He (neutron) • 11+60GeV72 days • 3+20GeV36days• 11+100GeV72 days • 12GeVSoLid3He:87%effec%vepolariza%on

Equalstat.forprotonandneutron(combine3HeandD)

11+60GeV 11+100GeV 3+20GeV

P 36d(3x1034/cm2/s) 36d(1x1034/cm2/s) 36d(1x1034/cm2/s)

D 72d 72d 72d3He 72d 72d 72d 16

6/9/11 HIX2010, Newport News, VA

3‐Dmomentumstructurethenucleon:DipolepaaernduetoSiverseffect

(PlotfromProkudin;red:posi%veeffect,blue:nega%veeffect)

Proton π+ (z = 0.3-0.7)

JLab Users Meeting 2011, Newport News, VA 6/9/11 18

Workshop on Nuclear Chromo-Dynamic Studies with a Future Electron Ion Collider

Argonne National Laboratory, April 7 - 9, 2010

  Topics:NuclearDVCS,shadowingandan%‐shadowing‐‐ColorTransparency‐‐

EMCeffect‐‐shortrangecorrela%ons‐‐nuclearformfactors‐‐Hadroniza%on‐‐Bose‐Einsteincorrela%ons‐‐hiddencolors

 Organizingcommi,ee:AlbertoAccardi,HamptonUniversityandJeffersonLabWilliamBrooks,UniversidadTécnicaFedericoSantaMaría,ChileClaudioCiofiDegliAp,UniversityofPerugia,ItalyDaveGaskell,JeffersonLabVadimGuzey,JeffersonLabKawtarHafidi,ArgonneNa%onalLabPaulHoyer,UniversityofHelsinki,Finland


Parton propagation and fragmentation

q

h

Υ*

e-

e-

Partonscreatedinthemediumcouldbeusedasacolorprobeofthegluondensityinanucleuswhenpartonlife%meandenergylossmechanismsareundertheore%calcontrol


Heavy flavors  EICoffersauniqueopportunitytostudyheavyquarkpropaga%on

andfragmenta%oninamediumwithknownproper%es

 Largemassofcharmandboaomallowinprincipletocalculatefragmenta<oninperturba<veQCD

 Heavyquarksareexpectedtohavereducedenergylosscomparedtolightquark

 Heavyquarkdetec<onrequiresavertexdetermina<onofatleast100μmandhighluminosityespeciallyboaomquarksofatleastfew1034


Luminosity:200fb-1

or115daysat2.1034cm-2s-1pertarget

s=1000GeV2

XBj>0.1

Multiplicityratiofor100GeV<ν<130GeV

Q2evolution

100GeV<ν<130GeV

Luminosity:200fb-1

or115daysat2.1034cm-2s-1pertarget

s=1000GeV2

XBj>0.1

Heavyquarkenergyloss

25

Electroweak Workshop Outcome: Physics Topics

 StudiesoftheElectroweakInterac%on(BSMPhysics)

➥ SearchforLepton‐Flavor‐Viola%one→τ

➥ Precisionsin2θWat10GeV2<Q2<60GeV2

 StudiesusingtheElectroweakInterac%on(NucleonStructure)

➥ Newspinstructurefunc%onsusingchargedandneutralcurrents➥ Aidsix‐flavorsepara%onofquarkpolariza%ons

AlltopicsexceptEWstructurefunc4onsneedhighintegratedluminosity(~100=‐1)

(Abitlessintegratedluminosityrequiredathighercenterofmassenergy)

26

Progress since June ’10

 INTworkshop(3daysdedicatedtoEWphysics,Oct25‐272010)➥ organizers:YingchuanLi,W.Marciano,K.Kumar➥ Experimentandtheorytalksonallthreetopics

 PhysicsEffort➥ MCsimula%onsofe‐tauprocesstoexplorecuts&background(SUNY

StonyBrook)➥ Theorydevelopedandpublishedone‐taureach(UWisconsin)➥ Spinstructurefunc%onsensi%vityexplored(UMass)➥ Weakmixinganglesensi%vitystudies(BNL)

 INTScienceDocumentcontribu%onsonallthreetopics➥ e‐tau:A.Deshpande,C.Faroughy,M.Gonderinger,K.Kumar,S.Taneja➥ weakmixingangle:Y.Li,W.Marciano,K.Kumar

➥ spinstructurefunc%ons:A.Deshpande,K.Kumar,S.Riordan,S.Taneja,W.Vogelsang

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Looking Forward

 EICScienceWhitePaperwillhaveanElectroweakPhysicssec%on➥ Editors:M.Ramsey‐MusolfandK.Kumar

 Ajointpublica%onisbeingdevelopedwithallthreesubtopicswithacombinedauthorlist➥ “ElectroweakPhysicsPoten%alofanEIC”

 ExperimentalStudies➥ DetectorSimula%onsandBackgroundStudiesfore‐tau➥ CombinedGlobalFipngofEWStructureFunc%ons

Interested?PleasecontactS.Riordan(UMass)orS.Taneja(SUNYStonyBrook)

Summary

  A high polarized luminosity EIC with variable energy will be important for the future of Hadronic and Nuclear Physics and QCD.

  More than one interaction region is important for complementarity of explored physics (exclusive vs semi-inclusive) and confirmation of discoveries.

A range from a s from 200 to 4000 GeV2 would be desirable A luminosity above 1034cm-2s-1

  We welcome you to join this physics effort and help with new physics ideas and experimental simulations. The work is still in progress.


Documents

Organized by Users Group and Sponsored by JLab and JSA