Transcript Fabienne Kunne

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
F. Kunne
NuPECC MEeting, Strasbourg, March 14, 2014 – 1
Questions
- How hadrons are formed and interact
from QCD degrees of freedom ?
 Lattice QCD calculations
- How does the proton spin originates at
the microscopic level ?
 Measuring pertinent spin sum rules
- How does confinement manifests itself
in the structure of hadrons ?
 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 – 2
Confinement, asymtotic freedom, factorisation
à short range, high energy
à long range, low energy
@animea
@animea
Degrees of freedom: quarks
and gluons
Bound states: hadrons
A unique laboratory for the study
of QCD
Perturbation theory
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.
F. Kunne
2
NuPECC MEeting, Strasbourg, March 14, 2014 – 3
Methods -1. Quark and gluon spin distributions
- Probe quarks or gluons in nucleon with lepton beams
- Measure spin asymmetry : polarized beam and target
quarks
Deep inelastic
scattering
gluons
Photon-gluon
fusion: ggqq
h
x : nucleon momentum
Q2
fraction carried by quark
: 4-momentum transfered (resolution ~ 1/Q)
→
→→
←
Dq = q - q
quark polarization
DS : sum over u, d, s flavours
DG
• Access quark and gluon spin contribution to the nucleon
• Compare to lattice QCD
F. Kunne
NuPECC MEeting, Strasbourg, March 14, 2014 – 4
Methods - 2. Generalized parton distributions
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
x, x : quark momentum fraction
t : transfer to proton
H(x,x,t) : Gen. Parton distribution
Can be studied in the interference regime (Jlab and COMPASS)
and at high energy where BH smaller (COMPASS)
- Theoretical concept: 1996
- First dedicated experiment 2004 JLab (IRFU/SPhN)
- One of the major goals of future programmes:JLab 12 GeV, COMPASS, EIC
GPD extraction
from data
2D Fourier T.
3D picture of the nucleon
Compare first moments to lattice QCD
F. Kunne
NuPECC MEeting, Strasbourg, March 14, 2014 – 5
Actors on two sites: CERN/COMPASS and JLab
Hall A
COMPASS
CLAS
International Collaboration , ~220 members
International Collaborations, ~200 members
Responsibilities in the collaboration:
Co- spokesperson of the collaboration, analysis
coordinator, technical coordinator, members of
drafting commitees and group leader board
Responsibilities in the collaboration:
Spokesperson of expts., member of the
steering committee, member of user board
Leadership : Longitudinal Spin program, DVCS
Add. fundings: FP6, FP7, ANR SPLAM,
ANR PARTONS, P2I, NSF
Leadership : DVCS, phenomenology
Add. fundings: FP6, FP7, ANR,GPD@CLAS12,
ANR SPLAM, ANR PARTONS, P2I(O), DOE
F. Kunne
NuPECC MEeting, Strasbourg, March 14, 2014 – 6
Main results from COMPASS
Instrumentation
- Recoil proton detector
- Large MPGD Micromegas
- Hybrid (GEM-MM)
- Large drift chambers
pixelized
- ECAL calorimeter monitoring
- RICH electronics
- Instrum of superconducting magnet
Physics results nucleon spin ½ = ½ DS + DG + Lq + Lg
Quark polarization per flavour
Hybrid (GEM-Micromegas)
pixellized
Gluon polarization
• COMPASS
Distribution de
polarisation des gluons
2=3 (GeV/c)2de
Distributions
Q
polarisation des quarks
Well measured.
Some puzzle with Ds (strange quark polarization).
F. Kunne
DG/G slightly >0 for xg~ 0.1.
Full integral not well constrained
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NuPECC MEeting, Strasbourg, March 14, 2014 – 7
COMPASS results cont’d
World 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
DS (x)
& DG(x)
F. Kunne shapes
NuPECC
MEeting,
Strasbourg, March 14, 2014 – 8
Main results from Jlab experiments
Instrumentation CLAS
Superconducting magnet for
active shielding
Monitoring for DVCS calorimeter
Micromegas for CLAS12 (next)
DVCS magnet
DVCS calorimeter
Experiments
DVCS expts: H, ~
H (spokesperson)
meson production
Important results
t
exp .(spokesperson)
Scattering on free quarks at low energy
Extensive measurements in
a wide kinamatical range
Precise DVCS data in a wide kinematical range
Study production mechanism of p°, r et w
Hall A
Scale invariance
F. Kunne
CLAS
NuPECC MEeting, Strasbourg, March 14, 2014 – 9
What’s next?
COMPASS
Jlab: Hall A and CLAS12
Muon and pion beams
160 – 200 GeV GeV
Intermediate luminosity
Study gluon and sea quarks
Electron beam
11GeV
High luminosity
Study valence quarks
Complementary approach in method and kinematics
Platform for
phenomenology
PARTO N S
(ANR)
A common goal: mapping of 3D nucleon structure
F. Kunne
NuPECC MEeting, Strasbourg, March 14, 2014 – 10
JLab12 DVCS program - Short & mid term plans
Accessing GPD H
Impact of
projected data
CLAS12
CLAS
Instrumentation : Micromegas trackers
Innovations : Cylindrical MM high transverse field
Start : 2015
Duration: 200 days of beam
Responsibilities : spokesperson, run group coordination
Expected results: 3D proton picture in valence region
IPNO (MG)
F. Kunne
NuPECC MEeting, Strasbourg, March 14, 2014 – 11
COMPASS DVCS and Spin - Short & mid term plans
Recoil proton detector
HERA:
gluons
?
’=
0.8
transverse
Sea quark
distribution
4m scintillators, st=300ps
COMPASS-II
Strange quark
distribution
Hybrid Micromegas-GEM pixel
Instrumentation : Recoil proton detector
Hybrid MM-GEM pixelized
Innovations :
4m scintillators st=300ps
Large size hybrid MM-GEM
COMPASS-II
DVCS :
2012, 2016-2017
Polarized Drell-Yan: 2014-2015
Responsibilities: leader of DVCS program in COMPASS
Expected results: 3D proton picture in sea region
TMDs + strange quark Fragmentation Functions, PDF and spin.
F. Kunne
NuPECC MEeting, Strasbourg, March 14, 2014 – 12
Long term: some study for future EIC collider
Optimized energy/ detector for electron
ion collisions
(DOE-BNL-JLab, 500M$, 2025?)
R&D proposal
MIT-Temple-Irfu:
Central tracker
EIC committee :
« well received and
fully funded (150 k$) »
French participation : Science case, phenomenology, instrumentation
Financements :
FP7, DOE
F. Kunne
NuPECC MEeting, Strasbourg, March 14, 2014 – 13
HADES at GSI (Darmstadt)
Study fundamental properties of the strong interaction:
vector meson (ρ,ω) studies in nuclear matter
pp at 3.5 GeV
and elementary collisions
Dilepton production
 Reference for medium effects
 Selective study of dielectron sources via exclusive
channels
 Electromagnetic structure of baryons (link with PANDA)
p0
h
r
w
IPNO technical contribution:
-6 drift chambers (external tracking plane)
-LH2 target
Crucial ingredient for the description:
production of ρ meson via baryonic resonances
IPNO physics contribution and responsibilities
Data analysis in NN reactions (dilepton and pion production)
Preparation of pion beam experiments (2014)
Phenomenological work on D Dalitz decay (DNe+e-)
Possible extension HADES@ FAIR
Study TL FF in transition D*N
+ p medium modif (coupled to baryonic
resonaces)
PANDA/FAIR
in Darmstadt
_
p beam
1.5-15 GeV/c
L =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 France
Nucleon structure through electromagnetic
channels in the Time-Like region
Challenging project for
Hadronic physics at IPN
Orsay in the years 2020
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)
Prototype 120
crystals
IPNO technical contribution
• 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
PANDA ECAL (~20 000
PbWO4 crystals)
IPNO physics contribution
-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
Expected precision
on R = |GE|/|GM|
Coordination of the Electromagnetic Processes
Working group
-Software development for electron tracking,
advanced PID and filtering methods
PANDA
-Development of phenomenological models and
event generators
• 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.
Applications beyond hadron physics
S.Procureur, IRFU
Innovative multiplexing pattern based on signal redundancy in MPGDs (patented)
50x50 cm², 1024 strips, 61 channels
1
2
→ 2 given channels are connected to neighbouring strips only once
in the detector
→ easily adaptable to the incident flux of particles
NIM A729 (2013), 888
→ can equip up to ~n²/2 strips with only n electronic channels
 Many applications in HEP and beyond, in particular with muon tomography:
N. Lesparre
Volcanology
S. Quillin
Homeland security
Mining/Archeology
S. Procureur
→ Proposal for the FET-Open
callNuPECC
in H2020
F. Kunne
MEeting, Strasbourg, March 14, 2014 – 17
Conclusion: an ambitious program
A coherent approach, and a leading role
2012-2014 : Analyses, instrumental developments, data taking GSI
2015-2017 : Data taking JLab and COMPASS
2017-2018 : Analyses, extraction of GPD,
First 3D nucleon imaging via PARTONS platform
2018+ :
Transverse target at JLab and COMPASS
Till 2020 :
Preparation for PANDA
Till 2025 :
Preparation for EIC collider
High responsibilities in the Collaborations, leader of experimental
programs, experts in these domains.
F. Kunne
NuPECC MEeting, Strasbourg, March 14, 2014 – 18