1 / 21

The CBM Experiment @ FAIR

The CBM Experiment @ FAIR. Volker Friese Gesellschaft für Schwerionenforschung Darmstadt. HI physics at intermediate beam energies CBM detector concept feasibility studies status. HI collisions at intermediate energies. beam energies 10 – 45 AGeV give access to:

lesley
Download Presentation

The CBM Experiment @ FAIR

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The CBM Experiment @ FAIR Volker Friese Gesellschaft für Schwerionenforschung Darmstadt • HI physics at intermediate beam energies • CBM detector concept • feasibility studies • status

  2. HI collisions at intermediate energies • beam energies 10 – 45 AGeV give access to: • highest baryon densities • onset of phase transition (?) • critical point (?) QM 2005, Budapest, August 2005

  3. Trajectories in the QCD phase diagram 3 fluid hydro calculation with hadron gas EOS predicts 30 AGeV to hit critical point phase boundary reached already at 10 AGeV V.Toneev et al., nucl-th/0309008 QM 2005, Budapest, August 2005

  4. Gazdzicki, Gorenstein, Act. Phys. Polon. B 30 (1999) 2705 NA49(QM 2004) Hama et al., Braz. J. Phys. 34 (2004) 322 Indications for onset of deconfinement at low SPS energies peak in strange/nonstrange yield ratio plateau of kaon slopes at SPS not satisfactorily explained in hadronic scenarios can be modeled assuming 1st order phase transition QM 2005, Budapest, August 2005

  5. Hadrons in dense environment CERES, Phys. Rev. Lett. 91, 042301 (2003) enhancement of low-mass dileptons stronger in 40 AGeV than in 158 AGeV even larger effect at lower energies? statistics and resolution must be improved to discriminate different in-medium scenarios QM 2005, Budapest, August 2005

  6. J/ψ suppression NA50, QM 2005 Gazdzicki & Gorenstein, Phys. Rev. Lett. 83 (1999) 4009 anomalous suppression observed at top SPS in J/ψ / DY but J/ψ / h- flat vs centrality (?) onset of suppression at lower energies ? QM 2005, Budapest, August 2005

  7. Gorenstein et al J. Phys. G 28 (2002) 2151 Charm near threshold predictions of ccbar production differ strongly between production scenarios (pQCD / QGP / hadron gas) strongest differences near threshold experiment should be able to discriminate QM 2005, Budapest, August 2005

  8. Charm in dense matter Mishra et al, nucl-th/0308082 D meson masses are expected to drop in dense environment should have strong effect on production yield Cassing et al, Nucl. Phys. A 691 (2001) 753 QM 2005, Budapest, August 2005

  9. Charm in dense matter (ctd.) Mishra et al, nucl-th/0308082 effect of reduced affectiv D mass: strong decay channels open for charmonium states observable in J/ψ yield in dileptons ? QM 2005, Budapest, August 2005

  10. The physics of CBM ? ! deconfinement at high ρB strangeness (K, Λ, Σ, Ξ, Ω) charm (J/ψ, D) flow in-medium properties of hadrons ρ, ω, φ→ e+e- open charm critical point fluctuations QM 2005, Budapest, August 2005

  11. SIS 100 Tm SIS 300 Tm U: 35 AGeV p: 90 GeV FAIR @ GSI QM 2005, Budapest, August 2005

  12. Detector considerations high interaction rates (beam intensity 109/s, high availability) rare observables (Ω, J/ψ, D) fast detector response and readout radiation hard detectors and electronics efficient online event selection STS tracking, displaced vertices TOF hadron ID RICH electron ID TRD electron ID ECAL lepton ID photons QM 2005, Budapest, August 2005

  13. Baseline detector concept TOF (10 m) ECAL (12 m) RICH (1,5 m) magnet beam TRDs (4,6,8 m) STS ( 5 – 100 cm) QM 2005, Budapest, August 2005

  14. 7 6 tracking 5 4 pixel detectors strip detectors vertexing 3 2 1 vacuum z = 5,10,(20) cm z = (20),40,60,80,100 cm The Silicon Tracking System "minimal setup": 3 pixel stations 4 strip stations momentum resolution < 1 % QM 2005, Budapest, August 2005

  15. y z (beam) RICH Design requests: electron ID p < 10 GeV/c pion suppression > 100 pion ID p > 4-5 GeV/c mirror: Be glass, r=450 cm two focal planes radiator: γ > 38 (e. g. N2) optical layout rings in focal plane ring radius vs momentum QM 2005, Budapest, August 2005

  16. TRD beam test July 2004, GSI serves for e/π separation and tracking position resolution 300 μm count rates up to 150 kHz/cm2 TR-Simulation R&D ongoing for fast gas detectors Readout: MWPC/GEM/Straw tube QM 2005, Budapest, August 2005

  17. Detector performance: acceptance incl. TOF Ξ Ω Λ bulk of produced hadrons covered by acceptance 10 35 AGeV QM 2005, Budapest, August 2005

  18. Detector performance: J/ψ single electron pt Simulation: J/ψ, D – HSD background – UrQMD momentum resolution 1 % pion suppression 104 pt cut 1 GeV/c, S/B ≈ 1 count rate 105/week 15 AGeV 25 AGeV 35 AGeV QM 2005, Budapest, August 2005

  19. Detector performance: D mesons Simulation: STS only (no PID) with MAPS Challenge: Implementation of secondary vertex cut in online event selection (reduction ≈ 1000 needed) 1011 events QM 2005, Budapest, August 2005

  20. CBM: Status Nov. 2001: FAIR Conceptual Design Report Jul. 2002: FAIR Recommendation by german Wissenschaftsrat Feb. 2003: approved by BMBF Jan. 2004: CBM Letter of Intent Jan. 2005: CBM Technical Status Report Next step: Technical Proposal (ca. 2 years) First beam on target in 2014 QM 2005, Budapest, August 2005

  21. The CBM collaboration Romania: NIPNE Bucharest Russia: CKBM, St. Petersburg IHEP Protvino INR Troitzk ITEP Moscow KRI, St. Petersburg Kurchatov Inst., Moscow LHE, JINR Dubna LPP, JINR Dubna LIT, JINR Dubna PNPI Gatchina SINP, Moscow State Univ. Spain: Santiago de Compostela Univ. Ukraine: Univ. Kiev Croatia: RBI, Zagreb Cyprus: Nikosia Univ. Czech Republic: Czech Acad. Science, Rez Techn. Univ. Prague France: IReS Strasbourg Germany: Univ. Heidelberg, Phys. Inst. Univ. HD, Kirchhoff Inst. Univ. Frankfurt Univ. Mannheim Univ. Marburg Univ. Münster FZ Rossendorf GSI Darmstadt Hungaria: KFKI Budapest Eötvös Univ. Budapest Italy: INFN Frascati Korea: Korea Univ. Seoul Pusan National Univ. Norway: Univ. Bergen Poland: Jagiel. Univ. Krakow Silesia Univ. Katowice Warsaw Univ. Warsaw Tech. Univ. Portugal: LIP Coimbra QM 2005, Budapest, August 2005

More Related