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Physics with Antiprotons - Detector -

Physics with Antiprotons - Detector -. Detector requirements Overview of the detector concept Selected detector components Simulations. Detector requirements (simulations). Formation of Ψ’ and decay in muons.

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Physics with Antiprotons - Detector -

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  1. Physics with Antiprotons - Detector - • Detector requirements • Overview of the detector concept • Selected detector components • Simulations

  2. Detector requirements (simulations) Formation of Ψ’and decay in muons • Energy release of charmed hadrons high → large ptrans → large angles • High cm-velocity (fixed target) → high energies → small angles Ψ’→μ+μ- electrons similar → calorimeter for large angles. Ψ’→J/Ψ + X ↓ μ+μ-

  3. Detector requirements (PID) p+p → ΦΦ→ 4K s½ =3.6 GeV • Forward angles need π/K separation up to 3 GeV/c: Cherenkov n=1.02 • Backward: higher value of n.

  4. Overview of detector concept target spectrometer forward spectrometer internal target top view Heavy charmed mesons decay in light products with large pt. Solenoid is important.

  5. side view Overview of detector concept

  6. 2 mio. forward pixels 100 x 150 μm 7.2 mio. barrel pixels 50 x 300 μm beam pipe pellet pipe Central tracking: Microvertex Detector Readout: ASICs (ATLAS/CMS) 0.37% X0 or pixel one side – readout other side (TESLA)

  7. σZ0=82 μm σD0=51 μm y z D0 Z0 x MVD single track resolution (Geant 4) p p 8.5 GeV 2π+ 2π- Vertex resolution is sufficient for D-physics c(D) = 314 μm, c(D0) = 124 μm

  8. pp(s = 4.4 GeV/c2)  J/+f. TS momentum resolution (Geant 4) MVD straw tubes MDC σM= 1.2% ???

  9. Particle identification • PID from • 00<Θ<50 hadronic calorimeter • 50<Θ<220 Aerogel Cherenkov Counters • 220<Θ<1400 DIRC (BABAR@SLAC) DIRC thickness: 0.19 X0

  10. DIRC PID B = 0 Tesla: Cherenkov opening angle: Internal reflection → different vel. thresholds B = 2 Tesla: Azimuthal deflection → more homogeneous detection efficiency

  11. p p(s = 3.6 GeV/c2) ff. DIRC PID (Geant4) K efficiency misidentification of π as K PID+tracking

  12. Calorimeter 22o 140o 5o PbWO4 Length = 17 X0 APD readout (in field) σ(E) = 1.54% / E½ + 0.3% pp  J/Ψ+η γγ

  13. 10 e±/π±sep. 8 e+/- 6 Edep (GeV/c) 4 2 π+ 0 2 4 6 8 p (GeV/c) π+ probability 10-3 electron/pion separation  10-3 0 2 4 6 8 p (GeV/c)

  14. Pellet target • Frozen hydrogen pellets 20-40μm • Δx=±1 mm (±0.04o) • 60 m/s • 70000 pellets/sec. • 1014-1016 atoms/cm2 (avg.) 1 mm

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