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The Compressed Baryonic Matter (CBM) experiment at FAIR Claudia Höhne, GSI Darmstadt CBM collaboration Outline physics case CBM experiment feasibility.

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Presentation on theme: "The Compressed Baryonic Matter (CBM) experiment at FAIR Claudia Höhne, GSI Darmstadt CBM collaboration Outline physics case CBM experiment feasibility."— Presentation transcript:

1 The Compressed Baryonic Matter (CBM) experiment at FAIR Claudia Höhne, GSI Darmstadt CBM collaboration Outline physics case CBM experiment feasibility studies of key observables supported by EU/FP6 HadronPhysics

2 Claudia Höhne DPG Frühjahrstagung, München, März Introduction milestone in mapping the QCD phase diagram would be the (unambiguous) discovery of either the critical point or the 1st order phase transition top SPS, RHIC, LHC : high T, low B region – most probably crossover high B region ! onset of deconfinement? 1st order phase transition? critical point? high baryon density! lower SPS, AGS: limited in observables, statistics SIS FAIR 2nd generation experiment! charm, dileptons, fluctuations, correlations

3 Claudia Höhne DPG Frühjahrstagung, München, März Dense baryonic matter baryon density in central cell (Au+Au, b=0 fm) in transport calculations HSD (mean field, hadrons + resonances + strings), QGSM similar results enormous energy and baryon densities reached! ( > crit ) [CBM physics group, C. Fuchs priv. com.]

4 Claudia Höhne DPG Frühjahrstagung, München, März Phase diagram [Bratkovskaya et al., PRC 69 (2004) ] UrQMD calculation of T, B as function of reaction time (open symbols – nonequilibrium, full symbols – appr. pressure equilibrium) phase border crossed already at rather low energies (see also results from 3-fluid hydrodynamics) critical point in reach? CBM energy range: AGeV for Au+Au

5 Claudia Höhne DPG Frühjahrstagung, München, März Physics of CBM physics topics deconfinement at high B ? softening of EOS ? order of phase transition ? Critical point ? in-medium properties of hadrons onset of chiral symmetry restoration at high B observables strangeness production: K, charm production: J/, D flow excitation function event-by-event fluctuations e + e - open charm rare probes high interaction rates!

6 Claudia Höhne DPG Frühjahrstagung, München, März The CBM experiment tracking, momentum determination, vertex reconstruction: radiation hard silicon pixel/strip detectors (STS) in a magnetic dipole field electron ID: RICH & TRD (& ECAL) suppression 10 4 hadron ID: TOF (& RICH) photons, 0, : ECAL high speed DAQ and trigger not necessarily fixed layout! more like facility STS

7 Claudia Höhne DPG Frühjahrstagung, München, März open charm production D 0 K - + (c = 124 m), minimum bias Au+Au collisions at 25 AGeV = ~50 m secondary vertex resolution proton identification via TOF even better signal for D + K (3-particle 2nd vertex) see poster of I. Vassiliev (HK21.40) [Mishra et al., Phys. Rev. C 69, (2004) ]

8 Claudia Höhne DPG Frühjahrstagung, München, März Dileptons [Rapp, Wambach, Adv. Nucl. Phys. 25 (2000) 1, hep-ph/ ] dileptons are penetrating probes! modifications in hot and dense matter expected – see CERES, NA50, NA60, HADES best way to measure? e + e - + -

9 Claudia Höhne DPG Frühjahrstagung, München, März dileptons - electrons low-mass vector mesons: develop sophisticated cut strategy J/ : cut on p t (1GeV) seems sufficient so far no track reconstruction, PID included see poster of T. Galatyuk (HK 21.10) J/ψe+e- central Au+Au, 25 AGeV p t >100 MeV φ ω

10 Claudia Höhne DPG Frühjahrstagung, München, März dileptons - muons study alternative CBM setup with active muon absorbers (Fe + C + detector layers) minimum bias Au+Au, 25 AGeV low efficiency for soft muons challenging muon detectors J/ψμ+μ- ρφω see poster of A. Kiseleva (HK 21.43)

11 Claudia Höhne DPG Frühjahrstagung, München, März dynamical fluctuations 4 acceptance identified particles K/ p/ data mixed events UrQMD: central Au+Au collisions at 25 AGeV, no track reconstruction see poster of D. Kresan (HK 21.42) resonance contribution? little influence of limited detector acceptance measurement feasible if dyn. fluctuations > 2%

12 Claudia Höhne DPG Frühjahrstagung, München, März CBM status and outlook FAIR recently approved by german cabinet CBM offers a very interesting physics program detector development under way increasingly realistic feasibility studies are performed open charm measurement well possible dilepton spectrum via dielectrons or dimuons? particle ratio fluctuations measurable down to ~ 2% talks at DPG:F. Uhlig HK 13.3J. Heuser HK 32.6 C. Steinle HK 32.7 posters at DPG:T. Galatyuk HK 21.10I. Vassiliev HK D. Kresan HK 21.42A. Kiseleva HK M. Hoppe HK 21.64E. Cordier HK S. Amar-Youcefi HK 21.79

13 Claudia Höhne DPG Frühjahrstagung, München, März CBM collaboration CBM Collaboration : 40 institutions, > 350 Members Croatia: RBI, Zagreb China: Wuhan Univ. Hefei Univ. Cyprus: Nikosia Univ. Czech Republic: CAS, Rez Techn. Univ. Prague France: IReS Strasbourg Hungaria: KFKI Budapest Eötvös Univ. Budapest India: VECC Kolkata Romania: NIPNE Bucharest Russia: IHEP Protvino INR Troitzk ITEP Moscow KRI, St. Petersburg Kurchatov Inst., Moscow LHE, JINR Dubna LPP, JINR Dubna LIT, JINR Dubna MEPHI Moscow Obninsk State Univ. PNPI Gatchina SINP, Moscow State Univ. St. Petersburg Polytec. U. Ukraine: Shevshenko Univ., Kiev Korea: Korea Univ. Seoul Pusan National Univ. Norway: Univ. Bergen Germany: Univ. Heidelberg, Phys. Inst. Univ. HD, Kirchhoff Inst. Univ. Frankfurt Univ. Kaiserslautern Univ. Mannheim Univ. Münster FZ Rossendorf GSI Darmstadt Poland: Krakow Univ. Warsaw Univ. Silesia Univ. Katowice Portugal: LIP Coimbra supported by EU/FP6 HadronPhysics, INTAS

14 Claudia Höhne DPG Frühjahrstagung, München, März multiplicities Au+Au, 25 AGeV ParticleN central N mbias J/ D0D

15 Claudia Höhne DPG Frühjahrstagung, München, März EOS in dense baryonic matter strong indications for soft EOS below ~ 3 0 from SIS (subthreshold K+, flow)... and at 8 0 with > crit ?? consequences ? dileptons, charm!? [C. Fuchs, priv. com.] [W. Weise, Proc. Hirschegg 2001]

16 Claudia Höhne DPG Frühjahrstagung, München, März Feasibility studies study feasibility of measurement of key observables by means of full scale simulations of the CBM detector and event reconstruction tracking efficiency and momentum resolution in STS (2 MAPS, 1 hybrid pixel, 4 strip detectors)


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