activities in hadronic physics
DESCRIPTION
Activities in hadronic physics. Nucleon structure: Jlab /Hall A & CLAS, CERN /COMPASS, Fair/ PANDA Vector mesons in nuclear matter: GSI / Hades. Fabienne KUNNE CEA Saclay IRFU SPhN France. @ animea. NB - Not covered: Theory. Questions . - PowerPoint PPT PresentationTRANSCRIPT
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 1
Activities in hadronic physics
Fabienne KUNNECEA Saclay IRFU SPhN
France
Nucleon structure: Jlab/Hall A & CLAS, CERN/COMPASS, Fair/PANDA
Vector mesons in nuclear matter: GSI/ Hades
NB - Not covered: Theory
@animea
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 2
Questions
- How hadrons are formed and interact from QCD degrees of freedom ?
- How does the proton spin originates at the microscopic level ?
- How does confinement manifests itself in the structure of hadrons ?
Lattice QCD calculations
Measuring pertinent spin sum rules
Space and momentum distributions of quarks and gluons- GPDs, Generalized Parton Distributions, DVCS Deep Virtual Compton Scattering- TMDs, Transverse Momentum Dependent distributions. SIDIS or Polarized Drell-Yan. - TDAs
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 3
Confinement, asymtotic freedom, factorisation
Bound states: hadrons
A unique laboratory for the study of QCD
Degrees of freedom: quarks and gluons
Perturbation theory
à long range, low energy à short range, high energy
The observed states are not the degrees of freedom of the theory, but …… factorization allows us to relate the observed states to the degrees of freedom in some ’’hard’’ processes.
2
@animea @animea
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 4
Methods -1. Quark and gluon spin distributions - Probe quarks or gluons in nucleon with lepton beams - Measure spin asymmetry : polarized beam and target
Deep inelastic scattering
Photon-gluon fusion: ggqq
quarks gluons
x : nucleon momentum fraction carried by quarkQ2 : 4-momentum transfered (resolution ~ 1/Q)
Dq = q - q quark polarization DS : sum over u, d, s flavours DG
h
• Access quark and gluon spin contribution to the nucleon• Compare to lattice QCD
→ → → ←
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 5
Methods - 2. Generalized parton distributions
x, x : quark momentum fractiont : transfer to protonH(x,x,t) : Gen. Parton distribution- Theoretical concept: 1996
- First dedicated experiment 2004 JLab (IRFU/SPhN)- One of the major goals of future programmes:JLab 12 GeV, COMPASS, EIC
3D picture of the nucleon
GPD extraction from data
2D Fourier T.
Compare first moments to lattice QCD
For the first time, study correlation between longitudinal quark momentum and quark transverse position in nucleon.
Deep virtual Compton scattering (DVCS)A process which interferes with Bethe-Heitler
Can be studied in the interference regime (Jlab and COMPASS) and at high energy where BH smaller (COMPASS)
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 6
Actors on two sites: CERN/COMPASS and JLab
International Collaboration , ~220 members
Responsibilities in the collaboration:Co- spokesperson of the collaboration, analysis coordinator, technical coordinator, members of drafting commitees and group leader board
Leadership : Longitudinal Spin program, DVCSAdd. fundings: FP6, FP7, ANR SPLAM,ANR PARTONS, P2I, NSF
International Collaborations, ~200 members
Responsibilities in the collaboration:Spokesperson of expts., member of the steering committee, member of user board
Leadership : DVCS, phenomenologyAdd. fundings: FP6, FP7, ANR,GPD@CLAS12,ANR SPLAM, ANR PARTONS, P2I(O), DOE
COMPASS
CLAS
Hall A
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 7
Main results from COMPASSInstrumentation- Large MPGD Micromegas- Large drift chambers- ECAL calorimeter monitoring- RICH electronics - Instrum of superconducting magnet
½ = ½ DS + DG + Lq + LgPhysics results nucleon spin
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Distributions depolarisation des quarks
Distribution depolarisation des gluons
Hybrid (GEM-Micromegas) pixellized
Q2=3 (GeV/c)2
• COMPASS
Quark polarization per flavour Gluon polarization
Some puzzle with Ds (strange quark polarization).DG/G slightly >0 for xg~ 0.1. Full integral not well constrained
- Recoil proton detector- Hybrid (GEM-MM) pixelized
Well measured.
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 8
COMPASS results cont’dWorld data on spin structure functions g1
proton deuteron
Data at high Q2 and low x + COMPASS NLO QCD fit of world data 0.27< DS < 0.32, in agreement with Lattice QCD,Largest uncertainty comes from functional shapes DS (x) & DG(x)
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 9
Main results from Jlab experiments
Important resultsScattering on free quarks at low energyPrecise DVCS data in a wide kinematical rangeStudy production mechanism of p°, r et w
Scale invariance
Extensive measurements in a
wide kinamatical range
Instrumentation CLASSuperconducting magnet for active shieldingMonitoring for DVCS calorimeterMicromegas for CLAS12 (next)
Experiments DVCS expts: H, H (spokesperson)meson production expt.(spokesperson)
DVCS magnet DVCS calorimeter
~
Hall A CLAS
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 10
What’s next? COMPASSMuon and pion beams160 – 200 GeV GeVIntermediate luminosityStudy gluon and sea quarks
Jlab: Hall A and CLAS12Electron beam11GeVHigh luminosityStudy valence quarks
Complementary approach in method and kinematics
A common goal: mapping of 3D nucleon structure
Platform for phenomenology
P A R T O N S(ANR)
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 11
JLab12 DVCS program - Short & mid term plans
Instrumentation : Micromegas trackersInnovations : Cylindrical MM high transverse field
Start : 2015Duration: 200 days of beamResponsibilities : spokesperson, run group coordinationExpected results: 3D proton picture in valence region
Impact of projected data
CLAS12
CLAS
Accessing GPD HCLAS12- Cylindrical Micromegas
Micromegas tile
IPNO (MG)
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 12
Instrumentation : Recoil proton detector Hybrid MM-GEM pixelizedInnovations : 4m scintillators st=300ps
Large size hybrid MM-GEM
’= 0.8
COMPASS-II
DVCS : 2012, 2016-2017Polarized Drell-Yan: 2014-2015Responsibilities: leader of DVCS program in COMPASSExpected results: 3D proton picture in sea region
TMDs + strange quark Fragmentation Functions, PDF and spin.
Sea quark transversedistribution
HERA:
gluons
?
Strange quark distribution
COMPASS-II
4m scintillators, st=300ps
COMPASS DVCS and Spin - Short & mid term plans
Hybrid Micromegas-GEM pixel
Recoil proton detector
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 13
Optimized energy/ detector for electron ion collisions (DOE-BNL-JLab, 500M$, 2025?)
R&D proposal MIT-Temple-Irfu: Central tracker
EIC committee : « well received andfully funded (150 k$) »
French participation : Science case, phenomenology, instrumentationFinancements : FP7, DOE
Long term: some study for future EIC collider
IPNO technical contribution: -6 drift chambers (external tracking plane) -LH2 target
pp at 3.5 GeVDilepton production
Data analysis in NN reactions (dilepton and pion production)
Phenomenological work on D Dalitz decay (DNe+e-)
Possible extension HADES@ FAIR
Preparation of pion beam experiments (2014)
IPNO physics contribution and responsibilities
HADES at GSI (Darmstadt)Study fundamental properties of the strong
interaction:vector meson (ρ,ω) studies in nuclear matter
and elementary collisions Reference for medium effects Selective study of dielectron sources via exclusive
channels Electromagnetic structure of baryons (link with PANDA)
Crucial ingredient for the description: production of ρ meson via baryonic resonances
r
h
p0
Study TL FF in transition D*N+ p medium modif (coupled to baryonic resonaces)
w
PANDA/FAIR in Darmstadt
Challenging project for Hadronic physics at IPN Orsay in the years 2020
p beam1.5-15 GeV/cL =2.1031-2.1032 cm-2s-1
(first beams at the end of the decade)
_
PANDA motivations: bring a novel insight into hadronic physics at the QCD frontier with a hermetic multipurpose detector
The impact of FranceNucleon structure through electromagnetic channels in the Time-Like region
1. p p e+ e- (access to Time-Like Form Factors)2. p p e+ e- p0 , J/ p0 (TDA: pion content of the proton)
-Demonstration of the feasibility of the nucleon
Time-Like Form Factors measurement:• separation of |GE| and |GM| up to 14
(GeV/c)2 • Geff up to 28 (GeV/c)2
• Coordination of the Electromagnetic Processes Working group
-Software development for electron tracking, advanced PID and filtering methods
-Development of phenomenological models and
event generators
PANDA ECAL (~20 000 PbWO4 crystals)
• Strong involvment of IN2P3 in the R&D phase
• Design of the cooling system (-25°C)
• Mechanical design of the calorimeter support structure
• Prototypes building and tests
Prototype 120 crystals
PANDA
Expected precision on R = |GE|/|GM|
• Despite a strong motivation of physicists, in a difficult budget situation, no positive decision about the level of the French investment in PANDA could be taken up to now• Towards a joint French effort in hadronic physics with Jlab and PANDA groups.
IPNO physics contribution
IPNO technical contribution
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 17
Applications beyond hadron physics
→ 2 given channels are connected to neighbouring strips only once in the detector
Þ Many applications in HEP and beyond, in particular with muon tomography:
Innovative multiplexing pattern based on signal redundancy in MPGDs (patented)
Volcanology Homeland security Mining/Archeology
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50x50 cm², 1024 strips, 61 channels
→ easily adaptable to the incident flux of particles→ can equip up to ~n²/2 strips with only n electronic channels
→ Proposal for the FET-Open call in H2020
NIM A729 (2013), 888
N. Lesparre S. Quillin
S. Procureur
S.Procureur, IRFU
F. Kunne NuPECC MEeting, Strasbourg, March 14, 2014 – 18
A coherent approach, and a leading role
2012-2014 : Analyses, instrumental developments, data taking GSI2015-2017 : Data taking JLab and COMPASS2017-2018 : Analyses, extraction of GPD, First 3D nucleon imaging via PARTONS platform2018+ : Transverse target at JLab and COMPASSTill 2020 : Preparation for PANDA Till 2025 : Preparation for EIC collider
High responsibilities in the Collaborations, leader of experimental programs, experts in these domains.
Conclusion: an ambitious program