Organized by Users Group and Sponsored by JLab and JSA ...
Transcript of Organized by Users Group and Sponsored by JLab and JSA ...
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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
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6/9/11 JLab Users Meeting 2011, Newport News, VA 2
JLab:makingsenseoutofhadronsandnuclei
Swimmingagainstthecurrentlikesalmontoreturntotheorigin
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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)
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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
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Why mEIC/ELIC?
Anaturalextensionofthe12GeVphysicsprogramofhadronstructureinfreespaceandinnuclei/QCD
However,theemphasisisnotthevalencequarksbutgluonsandseaquarksinthevalenceregionandbeyond
Thisrequireshighluminosityandadequatecenterofmassenergy➥ Luminosityiskeyforprobingthesystemusingknownprocesses
withhigherprecisionorexploringrareprocesses➥ Energyreachkeyforprovidingacleaninterpreta%onthrough
rigoroustestsinsomecase
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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
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Rutgers University / Jefferson Lab Electron-Ion Collider Workshop: Electron-
Nucleon Exclusive Reactions
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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
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Tool:GeneralisedPartonDistribu%ons
Generalizeddescrip%onin2+1dimensions
ValencequarkimagingofthenucleonisonegoalofJLabat12GeV.
• Gluonimagingiss%llmissing
• SeaQuarksimagingisalsomissing
• TotalSpinofthenucleonintermsofallofitscons%tuents.
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3‐Dquarkimagingofthenucleon
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Nucleon Angular Momentum
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JiSumrule(1997)
SpinofquarksContribu%on:MeasuredinDIS
Orbitalangularmomentumofquarks:InputfromLapceandmeasurementsatJLab12GeV
Totalangularmomentumofgluons
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➥ ThroughthemomentumsumruleandHERADVMPwithJ/PsidatawehaveaglimpseonGPDHg
➥ NothingisknownaboutGPDEg
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6/9/11 11JLab Users Meeting 2011, Newport News, VA
!!!!γ
J/ψ
!"""""
"#!""
""""#
PeterKroll
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“My“ Golden Experimental Program
!"#"$$% $&%JLab Users Meeting 2011, Newport News, VA!
!!!!γ
J/ψ
!"""""
"#!""
""""#
GlueimagingusingunpolarizedtargetsandaccessinggluonGPDHthroughexclusivemesonproduc%oninthevalenceregion
TransverselypolarizednucleontoaccessgluonGPDEandtheSpinSumRule.
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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
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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)
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Quark/
Nucleon
Quarkpolariza<on
Un‐Polarized LongitudinallyPolarized TransverselyPolarized
Nucleon
Polariza%
on
U
L
T
Transverse Spin Structure: Leading Twist TMDs
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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
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NucleonSpinQuarkSpin
h1T=
〈PSψ̄σµνψPS〉 =∫ 1
0dx [δq(x) − δq̄(x)]
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TensorCharge
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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
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6/9/11 HIX2010, Newport News, VA
3‐Dmomentumstructurethenucleon:DipolepaaernduetoSiverseffect
(PlotfromProkudin;red:posi%veeffect,blue:nega%veeffect)
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Proton π+ (z = 0.3-0.7)
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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
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Parton propagation and fragmentation
q
h
Υ*
e-
e-
Partonscreatedinthemediumcouldbeusedasacolorprobeofthegluondensityinanucleuswhenpartonlife%meandenergylossmechanismsareundertheore%calcontrol
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Heavy flavors EICoffersauniqueopportunitytostudyheavyquarkpropaga%on
andfragmenta%oninamediumwithknownproper%es
Largemassofcharmandboaomallowinprincipletocalculatefragmenta<oninperturba<veQCD
Heavyquarksareexpectedtohavereducedenergylosscomparedtolightquark
Heavyquarkdetec<onrequiresavertexdetermina<onofatleast100μmandhighluminosityespeciallyboaomquarksofatleastfew1034
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Luminosity:200fb-1
or115daysat2.1034cm-2s-1pertarget
s=1000GeV2
XBj>0.1
Multiplicityratiofor100GeV<ν<130GeV
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Q2evolution
100GeV<ν<130GeV
Luminosity:200fb-1
or115daysat2.1034cm-2s-1pertarget
s=1000GeV2
XBj>0.1
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Heavyquarkenergyloss
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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)
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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)
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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.
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