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A heavy-ion experiment at the future facility at GSI

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1 A heavy-ion experiment at the future facility at GSI
Compressed Baryonic Matter Compressed Baryonic Matter A heavy-ion experiment at the future facility at GSI Volker Friese GSI Darmstadt : A. Andronic, P. Braun-Munzinger, C. Finck, B. Friman, C. Finck, R. Holzmann, W. Koenig, M. Lutz, P. Senger, Y. Shin, R. Simon, J. Stroth Universität Frankfurt : H. Ströbele Universität Heidelberg : N. Hermann CBM Workshop, GSI, May 2002 V. Friese

2 The future facility at GSI
Compressed Baryonic Matter The future facility at GSI CBM CBM Workshop, GSI, May 2002 V. Friese

3 Baryon density in heavy-ion collisions at SIS200
Compressed Baryonic Matter Baryon density in heavy-ion collisions at SIS200 20 AGeV :  = 7 o CBM Workshop, GSI, May 2002 V. Friese

4 The phase diagram of strongly interacting matter
Compressed Baryonic Matter The phase diagram of strongly interacting matter CBM Workshop, GSI, May 2002 V. Friese

5 Compressed Baryonic Matter What can we expect? The future facility at GSI will deliver heavy-ion beams from 2 to 30 AGeV (maybe more) In heavy-ion collisions at such beam energies, extreme baryon densities are expected This gives the opportunity to study the region of dense baryonic medium in the QCD phase diagram, maybe even in the vicinity of the critical point Clearly, penetrating probes such as dipletons are needed CBM Workshop, GSI, May 2002 V. Friese

6 What do we know : In-medium modification of vector mesons
Compressed Baryonic Matter What do we know : In-medium modification of vector mesons CBM Workshop, GSI, May 2002 V. Friese

7 What do we know : In-medium modification of vector mesons
Compressed Baryonic Matter What do we know : In-medium modification of vector mesons At SPS, an excess of low-mass dipletons is observed The effect is stronger at 40 AGeV than at top SPS energy It is already seen at BEVALAC (1 AGeV) The interpretation seems to require a modified rho-meson The present data do not allow to distinguish between various in-medium scenarios There is need for a high-precision dilepton measurement CBM Workshop, GSI, May 2002 V. Friese

8 What do we know : Threshold production of strangeness / charm
Compressed Baryonic Matter What do we know : Threshold production of strangeness / charm ? CBM Workshop, GSI, May 2002 V. Friese

9 What do we know : Threshold production of strangeness / charm
Compressed Baryonic Matter What do we know : Threshold production of strangeness / charm The threshold production of kaons is sensitive to the in-medium modifications of the kaon masses This has been shown at SIS18 (KaoS and FOPI) A similar effect is expected for open charm D mesons have not been measured in heavy-ion collisions so far CBM Workshop, GSI, May 2002 V. Friese

10 What do we know : J/ suppression
Compressed Baryonic Matter What do we know : J/ suppression SPS (NA50) At top SPS energy, an anomalous suppression of J/ is observed Such a suppression is expected for a deconfined phase due to colour screening This is one of the evidences that the phase transition is reached at SPS Is there an onset of this effect with collision energy? No measurement below SPS energies up tp now CBM Workshop, GSI, May 2002 V. Friese

11 What do we know : Strangeness enhancement
Compressed Baryonic Matter What do we know : Strangeness enhancement Maximum in relative strangeness production observed for kaons around 30 AGeV Interpretation is still under debate CBM Workshop, GSI, May 2002 V. Friese

12 What do we know : Strangeness enhancement
Compressed Baryonic Matter What do we know : Strangeness enhancement Interpretations: Maximum is due to change in baryochemical potential (hadron gas model) or due to phase transition (statistical model of the early stage) The region around 30 AGeV is of special interest The measurement of multi-strange hyperons would be informative CBM Workshop, GSI, May 2002 V. Friese

13 What do we know : Event-by-event fluctuations
Compressed Baryonic Matter What do we know : Event-by-event fluctuations In the vicinity of the critical point, large fluctuations, e.g. in mean pt or chemical composition are expected Such fluctuations would be a direct proof of a phase transition At SPS, no non-statistial fluctuations are observed Looking for the critical point in the range 10 – 30 AGeV CBM Workshop, GSI, May2002 V. Friese

14 What would we like to measure ?
Compressed Baryonic Matter What would we like to measure ?   e+ e- with high precision J/  e+ e- D  K , K, p direct , ,  via topology event-by-event variables What do we need ? high beam intensities (109 / s) and reaction rates (up to 10 MHz) large acceptance (>2 ) trigger for rare probes All detector components have to deal with high reaction rates (fast readout, radiation hardness, high granularity) CBM Workshop, GSI, May2002 V. Friese

15 Experimental conditions
Compressed Baryonic Matter Experimental conditions URQMD 25 AGeV GEANT simulation: B = 1 T + 328 - 357 p 161 K+ 41 K- 13 700 – 1000 charged particles per event CBM Workshop, GSI, May 2002 V. Friese

16 Experimental task: Tracking
Compressed Baryonic Matter Experimental task: Tracking determination of momentum measurement of displaced vertex (D meson) Requirements: operation in magnetic field close to target radiation hardness high granularity minimal thickness A possible solution: Silicon pixel / strip detectors Radiation hard Silicon pixel/strip detectors magnet CBM Workshop, GSI, May 2002 V. Friese

17 Acceptance for the tracking system
Compressed Baryonic Matter Acceptance for the tracking system UrQMD 25 AGeV + GEANT 80% 60% incl. decay 67% 20% 30% CBM Workshop, GSI, May 2002 V. Friese

18 Experimental task: Hadron PID
Compressed Baryonic Matter Experimental task: Hadron PID separation of , K, p method : time of flight Requirements: distance from target 10 – 15 m large area to cover resolution < 100 ps high rate capability Possible solutions: Resistive plate counters ? Scintillators ? CBM Workshop, GSI, May 2002 V. Friese

19 Experimental task: Lepton PID
Compressed Baryonic Matter Experimental task: Lepton PID Dilepton measurement requires separation of e from  Requirements: suppression factor < 10-4 high electron efficiency Possible solution: 1. stage RICH 2. stage TRD (ALICE type) CBM Workshop, GSI, May 2002 V. Friese

20 J/ Detection PLUTO + GEANT simulation, 10 M events  
Compressed Baryonic Matter J/ Detection PLUTO + GEANT simulation, 10 M events e+, e- transverse momentum 0e+e- J/ (x105)  (x10-4) e+e- e+, e- opening angle J/ (x105) CBM Workshop, GSI, May 2002 V. Friese

21 J/ Detection signal / background  10
Compressed Baryonic Matter J/ Detection PLUTO + GEANT simulation, 10 M events with cuts: pt(e+,e-) > 1 GeV/c, lab 25o,  > 10o without cuts (incl. misident. pions) e+e- e+e- DDe+e-+X e+e- J/e+e- sum signal / background  10 estimated detection rate : 80,000 / week CBM Workshop, GSI, May 2002 V. Friese

22 A possible detector concept
Compressed Baryonic Matter A possible detector concept CBM Workshop, GSI, May 2002 V. Friese

23 Compressed Baryonic Matter Summary The future facility at GSI will provide heavy-ion beams from AGeV. A dedicated heavy-ion experiment will allow to study the (largely unknown) high B region of the QCD phase diagram. The physics questions that can be adressed are chiral symmetry restauration (vector meson properties), phase transition (J/, strangeness) and the critical point (fluctuations). The experiment should measure dileptonic decays of , , J/ with high precision, weak decays of multistrange hyperons, displaced vertices of D mesons as well as p, , K. These observables should be studied as a function of beam momentum and impact parameter. A first, schematic detector concept includes a silicon tracking system, a RICH, a TRD and a TOF-Wall. The experimental challenge will be to deal with unprecedented high beam intensities / reaction rates that are needed for rare probes. CBM Workshop, GSI, May 2002 V. Friese

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