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Experimental frontiers: High precision High intensity Theoretical symbiosis: Effective field theories Lattice QCD Perturbative QCD HadronPhysics I3: 11 Research infrastructures 140 Institutions 2000 Physicists. Hadron Structure & Spectroscopy. Celsius 1.3 GeV p Cooler Ring. - PowerPoint PPT Presentation
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Günther Rosner EUROHORC/NuPECC, Paris, 29/11/04
1
Hadron Structure& Spectroscopy Experimental frontiers:
High precision High intensity
Theoretical symbiosis: Effective field theories Lattice QCD Perturbative QCD
HadronPhysics I3: 11 Research
infrastructures 140 Institutions 2000 Physicists
Celsius1.3 GeV p
Cooler RingMAX-lab0.25 GeV
DANEe+, e- Collider
16 MeV KL = 1032
GRAAL – ESRF106/s 1.5 GeV
COMPASS – CERNμ+, μ-, hadrons
L = 1032
PANDA – FAIR (GSI)15 GeV anti – p
L = 1032
Cooler Ring
HERMES – DESY27.6 GeV e+, e-
L = 1032
COSY – FZ Jülich2.5 GeV p
Cooler Ring
MAMI (Mainz)1.5 GeV e, L = 1038
108/s
ELSA (Bonn)3.5 GeV e, L = 1034
107/s
Günther Rosner EUROHORC/NuPECC, Paris, 29/11/04
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Methodology
Hadrons = strongly interacting particles Theory: Quantum Chromodynamics
Exchange of mesons at nuclear physics energy scale
Exchange of gluons at high energies Experiment:
Scattering of high-energy light or leptons on hadron targets
Observation of hadron excitation spectra
Günther Rosner EUROHORC/NuPECC, Paris, 29/11/04
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Lepton microscopy
Beams Electrons Positrons Muons Photons
Resolution Energy Accelerator Cooling Spectrometers
Physics potential Polarised beams Polarised targets
Nuc le us
Q ua rk
Günther Rosner EUROHORC/NuPECC, Paris, 29/11/04
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Mainz Microtron MAMI
2006
2004/6
2006
2006
1.5 GeV electrons
Günther Rosner EUROHORC/NuPECC, Paris, 29/11/04
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Global properties of nucleons & resonances: magnetic moments
Günther Rosner EUROHORC/NuPECC, Paris, 29/11/04
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The HERMES spectrometer
27.6 GeV e+/e-
Recoil Detector, 2005
Günther Rosner EUROHORC/NuPECC, Paris, 29/11/04
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Hunt for wild QCD animals, Part I Pentaquarks
Mass m = 1.53 GeVIntrinsic width = 17 MeV
Significance 4.3
Deuteron Target
Günther Rosner EUROHORC/NuPECC, Paris, 29/11/04
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Proton spin ?
½ = ½ q + G + Lq
~ 25% COMPASS 2006… HERMES Recoil 2005…
“Spin crisis” EMC - CERN: q ~ 10%
Spin generators: Quarks
Valence quarks (uud)
Sea quarks (q anti-q)
Gluons (spin 1) Quark angular
momentum
Mathematically:
“Spin puzzle” HERMES: q ~ 25%
Günther Rosner EUROHORC/NuPECC, Paris, 29/11/04
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0AVMD||
q
ΔqADIS
|| q
ΔqAQCDC
|| G
ΔGAPGF
||
Gluon polarization Photoproduction of high
pT –hadron pairs →
Contributing diagrams:
Corresponding
asymmetries:
Günther Rosner EUROHORC/NuPECC, Paris, 29/11/04
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The COMPASS experiment @ CERN
Polarization:• Beam: ~80%• Target:<50%>
Beam: 160 GeV µ+
2 . 108 µ/spill (4.8s/16.2s)
Polarizedtarget
SM1RICH
ECal1 & Hcal1
Muon filter 1
SM2
MWPCs
Micromegas &Drift chambers
ECal2 & Hcal2
Muon filter 2
GEM & MWPCs
SciFi
GEM & MWPCs
GEM & Straws
SiliconSciFi Scintillating
fibers
~50m
Günther Rosner EUROHORC/NuPECC, Paris, 29/11/04
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Hunt for wild QCD animals, Part II Hybrids & Glueballs @ PANDA
QED QCD
Confinement Hybrids ?
Glueballs ?