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

Mesons and ExoticsMesons and Exotics

detector scenario for HESRdetector scenario for HESR

detector features:tracking of charged particles measurement and identification of , e, , , K, p, p high rate capability sophisticated and fast trigger scheme