1. Experiment CBM – research program Paweł Staszel Jagiellonian University  Physics motivation  Detector concept  Feasibility study  Status

2. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.20082 Diagram fazowy QCD

3. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.20083 QCD Phase Diagram scan with A+A collisions V.Toneev et al., nucl-th/0309008 3 component hydrodynamics + hadron gas EOS: Critical Point reached at trajectory for ~30 AGeV (√s NN =7.74) Phase Boundary reached already at ~10 AGeV (√s NN =4.72)

4. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.20084 How to explore interesting regions of the QCD Phase Diagram Lattice QCD calculations: Fedor & Katz, Ejiri et al. Freeze-out phase can be studied by measurement of „soft” hadrons production (bulk observables)‏ Information about earlier phases is carried by rare probes: High p T particles Particles decaying in to leptons Particles build up of heavy quarks (  J/ψ, D, Λ c.... )‏ and by collective motion (flow) of the created soft medium. (e.g. v 2 is sensitive to the quanta interaction just after the medium formation) large advantage from simultaneous flow measurement of “ordinary” hadrons and rare probes

5. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.20085 Experymental arguments for Phase Transition at low SPS energy NA49 (QM 2004) ‏ None monotonic behaviour of K + /  + ratio Effective temperature shows plateau in the range of SPS energy

6. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.20086 Hadrons in dense medium (->e + e - )‏ Top SPS: excess of e + e - pairs around 0.5 GeV (by factor of ~2.8)‏ 40AGeV: the excess rised up to ~4 → strong dependency on  B Rapp-Wambach –  in-medium modification Rapp: “dropping mass” according to Brown-Rho scaling scenario Thermal model

7. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.20087 Hadrons in dense medium (->  +  - )‏ NA60, Nucl. Phys. A 774 (2006) 67 broadening of   spectral function (Rapp-Wambach) ‏ contradiction with mass drop scenario (Brown-Rho scaling) ‏ excess by factor of 4 over the “cocktail” with 25% systematic uncertainty ! ‏

8. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.20088 Open Charm in dense medium‏ Mishra et al, nucl-th/0308082 Reduction in the effective mass of D-meson can open D-Dbar decay channel for charmonium states → possible scenario for the J/ Ψ suppression, CBM=> simultaneous measurement of J/ Ψ and D-mesons

9. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.20089 J/Ψ suppression Anomalous J/ψ suppresion (AS) on SPS, L – effective path in medium NA50, QM 2005 NA60 evidenced same effect in In+In Better scaling is obtained in N part ; onset already at N part ~90, At lower energies (larger μ B ) one can expect onset of AS for more central collisions → dependency on energy density and μ B Important measurement of open charm to verify other scenarios

10. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200810 Elliptic flow KE T = m T -m all particles flow (even these with charm!)‏ scaling if taking the underlying number of quarks into account! →like (all!) quarks flow and combine to hadrons at a later stage (hadronisation)‏ data can only be explained assuming a large, early built up pressure in a nearly ideal liquid (low viscosity!)‏ baryons n=3 mesons n=2 [PHENIX, PRL.98:162301,2007]

11. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200811 Elliptic flow at SPS data at top SPS support hypothesis of early development of collectivity influence of hadronic rescattering phase, resonance decay? lack of complete thermalization, viscosity effect? larger pt-range needed Pb+Pb collisions, √s NN = 17.3 GeV [NA49, G. Stefanek, PoS CPOD2006:030,2006]

12. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200812 Event-by-event fluctuations [NA49 collaboration, arXiv:0810.5580v2 [nucl-ex]]arXiv:0810.5580v2 observation might become enormously difficult correlation length  of sigma field, may become rather small for a finite lifetime of the fireball large acceptance needed! [Stephanov, Rajagopal, Shuryak, PRD60, 114028 (1999)] 1st try to identify 1st order phase transition line fluctuations, correlations with large acceptance and particle identification

13. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200813 Dynamical Fluctuations (by D. Kersan)‏ Measure the particle yields ratio in an event : K/  Relative width of distribution :  = RMS / MEAN  data 2 =  fin 2 +  exp 2 +  dyn 2 background Event mixing: no two tracks coming from one real event  mixed  dyn 2 =  data 2   mixed 2

14. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200814 Dynamical Fluctuations in UrQMD 44 RECO + PID

15. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200815 Toy Model Toy Model features: 1.Independent particle production with yields and kinematics from UrQMD 2.Extra kaon multiplicity fluctuation 3.Resonance decays

16. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200816 Resonances in Toy Model – K* K*(892) 0  K  = 41 = 363 Independently produced:

17. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200817 Resonances in Toy Model –   K+KK+K K0LK0SK0LK0S 00 0000 ++ = 41 = 363 Independently produced: analytical formula

18. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200818 Conclusion (fluctuation feasibility study)‏ Hadron ID and event-by-event fluctuations of the kaon to pion ratio were studied with full event reconstruction in CBM Kaons can be identified up to p = 3.5 GeV/c The current setup is sensitive to event-by-event fluctuations above 1 % Resonance decays influence the fluctuation measure; the effect obtained in a toy model is in agreement with analytical predictions

19. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200819 CBM: Physics topics and Observables Onset of chiral symmetry restoration at high  B in-medium modifications of hadrons ( , ,   e + e - (μ + μ - ), D )‏ Deconfinement phase transition at high  B excitation function and flow of strangeness (K,  )‏ excitation function and flow of charm (J/ψ, ψ', D 0, D ,  c )‏ charmonium suppression, sequential for J/ψ and ψ' ? corelated with open charm ? The equation-of-state at high  B collective flow of hadrons particle production at threshold energies (open charm) QCD critical endpoint excitation function of event-by-event fluctuations (K/π,...)‏ predictions? clear signatures? → prepare to measure "everything": bulk particles and rare probes ⇒ probing medium with known overall characteristics → systematic studies! (pp, pA, AA, energy)‏

20. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200820 Heavy Ion Experiments (selection ) ‏ time (advance in technology)‏ LHC RHIC SPS SIS300 SIS18Bevalac SIS 100 AGS  Inner Tracker  HPID TPC upgrade C B M GAP

21. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200821 CBM Detector (->e + e - )‏ TRDs (4,6,8 m)‏ STS ( 5 – 100 cm)‏

22. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200822 CBM Detector (->  +  - ) ‏ beam ABSORBER (1,5 m)‏ TRDs (4,6,8 m)‏ TOF (10 m)‏ ECAL (12 m)‏ STS ( 5 – 100 cm)‏ magnet

23. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200823 Silicon Tracking Station – heart of CBM Challenge: high track density:  600 charged particles in  25 o @10MHz Tasks: track reconstruction: 0.1 GeV/c < p  10-12 GeV/c  p/p ~ 1% (p=1 GeV/c)‏ primary and secondary vertex reconstruction (resolution  50  m)‏ V 0 track pattern recognition c  = 312  m radiation hard and fast silicon pixel and strip detectors self triggered FEE high speed DAQ and trigger online track reconstruction!

24. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200824 Simulation: rare probes D0D0 cc J/   di-electrons di-muons '' ''

25. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200825 Simulation: bulk particles and hyperons ‏ incl. TOF 1035 AGeV Λ Ξ Ω

26. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200826 Hiperons: PID from decay topology in STS  

27. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200827 Status CBM Collaboration undergoes (phase) transition simulation → prototyping

28. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200828 Double and triple GEM detectors 2 Double-sided silicon microstrip detectors Radiation tolerance studies for readout electronics Full readout and analysis chain: Front-end board with self-triggering n-XYTER chip Readout controller Data Acquisition System online offline Go4Go4 Analysis Detector signals Successful test of CBM prototype detector systems with free-streaming read-out electronics using proton beams at GSI, September 28-30, 2008 GSI and AGH Krakow VECC Kolkata KIP Heidelberg

29. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200829 CBM hardware R&D RICH mirror n-XYTER FEB Silicon microstrip detector MVD: Cryogenic operation in vacuum RPC R&D Forward Calorimeter GEM dipole magnet

30. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200830 CBM Collaboration China: Tsinghua Univ., Beijing CCNU Wuhan USTC Hefei Croatia: University of Split RBI, Zagreb Portugal: LIP Coimbra Romania: NIPNE Bucharest Bucharest University Poland: Krakow Univ. Warsaw Univ. Silesia Univ. Katowice Kraków AGH (Inst. Nucl. Phys. Krakow)‏ LIT, JINR Dubna MEPHI Moscow Obninsk State Univ. PNPI Gatchina SINP, Moscow State Univ. St. Petersburg Polytec. U. Ukraine: INR, Kiev Shevchenko Univ., Kiev Univ. Mannheim Univ. Münster FZ Rossendorf GSI Darmstadt Czech Republic: CAS, Rez Techn. Univ. Prague France: IPHC Strasbourg Germany: Univ. Heidelberg, Phys. Inst. Univ. HD, Kirchhoff Inst. Univ. Frankfurt Hungaria: KFKI Budapest Eötvös Univ. Budapest India: Aligarh Muslim Univ., Aligarh IOP Bhubaneswar Panjab Univ., Chandigarh Gauhati Univ., Guwahati Univ. Rajasthan, Jaipur Univ. Jammu, Jammu IIT Kharagpur SAHA Kolkata Univ Calcutta, Kolkata VECC Kolkata Univ. Kashmir, Srinagar Banaras Hindu Univ., Varanasi Korea: Korea Univ. Seoul Pusan National Univ. Norway: Univ. Bergen Kurchatov Inst. Moscow LHE, JINR Dubna LPP, JINR Dubna Cyprus: Nikosia Univ. 55 institutions, > 400 members Dubna, Oct 2008 Russia: IHEP Protvino INR Troitzk ITEP Moscow KRI, St. Petersburg

31. Paweł StaszelV Polish Workshop on Relativistic Heavy-Ion Collisions, Kielce 7.12.200831 Mapping the QCD phase diagram with heavy-ion collisions net baryon density:  B  4 ( mT/2  h 2 c 2 ) 3/2 x [exp((  B -m)/T) - exp((-  B -m)/T)] baryons - antibaryons Lattice QCD calculations: Fedor & Katz, Ejiri et al. SIS300