C. Schwarz Experiments with a cooled p beam on an internal target Physics program Detector set-up p e - coolerdetector High Energy Storage Ring HESR P max = GeV/c L max = 2·10 32 cm -2 s -1 Ø < 100 μm Δ p/p = …10 -5

C. Schwarz Physics program Charmonium spectroscopy Medium modifications of D mesons and J/Ψ in nuclei Hypernuclei CP violation Glueballs Hybrids

C. Schwarz Charmonium gives information about QCD confinement potential. Many states are still missing. pp: direct formation of all states. HESR allows investigation of states above DD threshold. Cooled beams with Δp/p=10 -4 …10 -5 allow high precision scan of resonances. Charmonium spectroscopy 40 keV Crystal Ball e + e -

C. Schwarz Charmonium spectroscopy Crystal Ball e + e -

C. Schwarz Glueballs Hybrids qqg ggg HybridGlueball Normal meson: 2 fermions P = (-1) L+1 C = (-1) L+S Excited glue: bosonic degree of freedom → exotic quantum numbers eg. J PC =1 -+, 0 --, 0 +-, 2 +- … → normal quantum numbers Signal: exotic quantum numbers: partial wave analysis normal quantum numbers: model comparison (LGT) mixing with normal mesons charm sector: few resonances with small widths qq Meson

C. Schwarz Glueballs Hybrids

C. Schwarz Medium modifications of D mesons and J/Ψ in nuclei Continuation of present GSI physics FOPI, KAOS, HADES, …HESR Signal: medium modification of production threshold, resonance width e.g. Ψ’, χ 2 Absorption cross section of J/Ψ in nuclei (ρ=ρ 0 ). pionic atoms KAOS/FOPI HESR π K D vacuumnuclear medium ρ = ρ 0 π+π+ π-π- K-K- K+K+ D+D+ D-D- 25 MeV 100 MeV 50 MeV ? Mass modifications of mesons

C. Schwarz Hypernuclei -- 3 GeV/c K+K Trigger _  secondary target  - (dss) p(uud)   (uds)  (uds) study of  interaction p

C. Schwarz CP violationin Hyperon decay p + p → Λ +Λ ↓ ↓ pπ - pπ + Measure decay asymmetry of angular distribution of p relative to Λ-Hyperon momentum. I p (θ p ) ~ 1+α cos(θ p ) for Λ CP conservation: α = - α Signal for CP violation: Theoretical prediction: Experiment: reconstructed ΛΛ L=2·10 32 cm -2 s -1 → >1 year running

C. Schwarz HESR-Detector Formation of Ψ’ and decay in myons Ψ’→μ + μ - Ψ’→J/Ψ + X ↓ μ + μ - electrons similar → calorimeter for large angles. Simulations

C. Schwarz HESR-detector Internal target forward spectrometertarget spectrometer Heavy charmed mesons decay in light products with large p t. Solenoid is important. top view

C. Schwarz HESR detector side view

C. Schwarz Costs Solenoid 2.5 M€ Calorimeter (target) 12.5 M€ Tracking ( pixel detector, straw tubes) 3.0 M€ Cherenkov 3.5 M€ Hypernuclei ( read out electronics,micro tracker) 2.0 M€ Varia 1.9 M€ Trigger 1.5 M€ Infrastructure 2.0 M€ Contingency 2.0 M€ Sum 30.9 M€

C. Schwarz Interest: LEAR, COSY, SATURNE community Munich Germany Bochum “ Giessen “ Dresden “ Erlangen “ Jülich “ FerraraItaly Turin “ Krakow Poland Warsaw “ EvanstonUSA

C. Schwarz

Microvertex Detector 7.2 mio. barrel pixels 50 x 300 μm 2 mio. forward pixels 100 x 150 μm beam pipe pellet pipe

C. Schwarz Detection of internally reflected Č-light (DIRC)