New Perspectives for Physics with Antiprotons: the HESR-Project at GSI
New Perspectives for Physics with Antiprotons: the HESR-Project at GSI
Volker MetagII. Physikalisches InstitutJustus-Liebig-Universität
Gießen, Germany
XXVII Mazurian Lakes School of Physics,September 2-9, 2001
Quantum chromodynamics at short distances S << 1
Quantum chromodynamics at short distances S << 1
quantitative description of the experimental cross section over 10 orders of magnitude by
perturbative QCD!
jet transverse energy
perturbative treatment: example:jet production in pp-collisions at = 1.8 TeV (Fermilab)s
p p
Quantum chromodynamics at large distancesQuantum chromodynamics at large distances
S (Q2) 1 for Q2 1 GeV2
non-perturbative phenomena: confinement, chiral symmetry breaking
challenge: explore QCD in the non-perturbative regime
10-18 10-17 10-16 10-15
distance [m]
charmonium spectroscopy: testing confinement
charmonium spectroscopy: testing confinement
unique window to study interplay of perturbative and non-perturbative effects
open problems in J/ spectroscopy:
• search for c'-state • confirm 'P1-state • measure transition rates • identify states above DD threshold
energy levels, widths: details of QQ interaction
exclusive decays: sensitive to
non-perturbative effects
spontaneous symmetry breakingspontaneous symmetry breaking
paramagnetic ferromagnetic
chirally symmetric world
our world
had
ron
mas
s
temperature, density