Presentation on theme: "Hierarchies of Matter matter crystal atom atomic nucleus nucleon quarks 10 -9 m 10 -10 m 10 -14 m 10 -15 m < 10 -18 m (macroscopic) confinement hadron."— Presentation transcript:
Hierarchies of Matter matter crystal atom atomic nucleus nucleon quarks m m m m < m (macroscopic) confinement hadron masses general features: constituents observed as free particles nucleon: constituents (quarks) not observed as free particles
Hadron Physics How are hadrons (baryons and mesons) built from quarks and gluons ? Can we quantitatively account for the confinement of quarks and gluons inside hadrons ? e.g., nucleon mass ?
J/ spectroscopy confinement glueballs (ggg) and hybrids (ccg) hidden and open charm mesons in nuclei hypernuclei Physics program at the HESR Further possibilities: Inverted Deeply Virtual Compton Scattering CP-violation (D/ -sector) fundamental symmetries; p in traps
The GSI p - Facility p production with 29 GeV p-beam p production rate: 10 7 /s p-stored in the HESR: (High Energy Storage Ring) p-momentum: GeV/c N stored : p High luminosity mode L cm -2 s -1 p/p (stochastic cooling) High resolution mode L cm -2 s -1 p/p (e – - cooling)
Quantumelectrodynamics (QED) Quantumchromodynamics (QCD) confinement potential Masse / MeV D21D2 3D23D2 3 P 0 (~3800) 3 P 1 (~3880) 3 P 2 (~3940) terra incognita Charmonium 1fm Charmonium ( c c )Positronium (e + e – ) ionisation energy binding energy meV Positronium 0.1nm 1S01S0 1S01S0 1S01S0 3S13S1 3S13S1 1P11P1 3P13P1 3P03P0 3P23P2
comparison e + e¯ versus pp e + e - interactions: only 1 -- states formed other states populated in secondary decays (moderate mass resolution) pp reactions: all states directly formed (very good mass resolution) production of 1,2 formation of 1,2 Crystall Ball E 760 (Fermilab) m (beam) = 0.5 MeV
Glueballs characteristic feature of QCD self-interaction among gluons predicted masses: GeV/c 2 candidate: f 0 (1500): 0 ++ ; =110MeV no flavour blind decay mixing with neighbouring scalar meson states search for higher lying glueball states mixing with (qq) and (QQ) excluded for exotic states mixing with (QQ) small width 100 MeV
charmed hybrids (ccg) predicted masses: GeV/c 2 lowest state: J PC = 1 –+ (exotic) width: could be narrow (LGT: 10 MeV) forbidden decays: e.g. O +– DD, D * D *, D S D S (CP-violation) (QQg) (Qq) L=0 + (Qq) L=0 (dynamic selection rule) below 4.3 GeV/c 2 no decay into DD preferred decays: (ccg) (cc) + X e.g. 1 +– J/ + , ,
in-medium modification of mesons study of chiral symmetry restoration in the charm sector
Open Charm in Nuclei Consequence of dropping D- meson mass in the medium: strong enhancement of D-meson cross section in near/sub-threshold region probing D-meson properties at ground state nuclear matter density and T 0 (complementary to heavy ion collisions)
J/ - nucleon interaction J/ - suppression regarded as signature for the generation of the quark-gluon plasma in ultra-relativistic nucleus-nucleus collisions suppression due to purely hadronic interactions? measure N-J/ cross section in nuclear matter
Strangesess Neutron Number three-dimensional nuclear chart with strangeness degree of freedom
synergy effect: parallel operation of physics programs
Conclusion The interaction of cooled antiproton beams with nucleons and nuclei opens up a broad and challenging research program ranging from non-perturbative QCD – phenomena (glueballs, hybrids, confinement, chiral symmetry breaking) to CP-violation and tests of fundamental symmetries. High luminosity and monochromaticity at HESR will provide high precision data and sensitivity to rare processes. Electron-cooling in the HESR is a technological challenge. With the realisation of the HESR as integral part of the future accelerator facility, GSI will play a pioneering role in the experimental exploration of long-distance (non-perturbative) QCD and the structure of hadronic matter.