Exploring the phase diagram of strongly interacting matter

Exploring the QCD phase diagram at large μB with heavy-ion collisions:Low-energy RHIC: search for QCD-CP with bulk observables NA61@SPS: search for QCD-CP with bulk observables MPD@NICA: search for the QCD mixed phase with bulk observablesCBM@FAIR: scan of the phase diagram with bulk and rare observables

CBM Strategy:

search for signatures of a first order phase transition by scanning carefully excitation functions of bulk and rare observables

CBM observables (measured as function of beam energy and system size):

• Bulk observables with “unlimited” statistics, e.g. ~1010-11 kaons, 1010 Λ• yields, spectra, • Correlations, fluctuations • Flow – scaling behavior, EOS?

• Rare probes with excellent statistics

• 108 , 106 • Low-mass dileptons: 106 , , -mesons (each) (critical slowing down at CP: enhanced radiation)• 106 J/, 103 ’• Open charm: 104 D0, D±, DS, Λc

• Charm production and propagation: ratio of charmonia and open charm

Number of particles above given in “1 CBM unit” = 10 weeks minbias Au+Au collisions at 25 AGeV = 1 CBM year (100% beam availability)

CBM Physics Book ready for submission in April 2009

CBM Progress Report 2008

(77 contributions)

Editors: V. Friese, W. Müller

CBM organisation Chairman of the CB: Mihai Petrovici

Management Board: Norbert Herrmann (Germany), Mihai Petrovici (Romania), Fouad Rami (France), Dieter Roehrich (Norway), Joachim Stroth (Germany), Johannes Wessels (Germany), Y. Zaitsev (Russia), S. Chattopadhyay (India)

Spokesperson: P. SengerDeputy spokespersons: S. Chattopadhyay (India), Y. Zaitsev (Russia)

Techn. coordinator: W. Müller

Physics/Software coordinator: V. Friese

Resources coordinator: J. Eschke (Germany)

Conceptual design and feasibility studies:

side view front view

Central Au+Au collision 25 AGeV (UrQMD): 770 reconstructed tracks

• Framework FAIRroot: Root + Virtual Monte Carlo Transport codes GEANT 3 & 4, FLUKA Event generators UrQMD, HSD, PLUTO

• Fast ("SIMDized") track reconstruction algorithms for online event selection using many-core architectures• not fully realistic detector layouts and response functions

Fast track reconstruction algorithms running graphic processing units:

• fitting: 22 million tracks/s

• track reconstruction efficiency > 96 %

• momentum resolution Δp/p < 1.5 %

Example: Silicon Tracking System

STS: 8 stations double-sided Silicon micro-strip sensors (8 0.4% X0)

MVD: 2 stations MAPS pixel sensors (0.3% X0, 0.5% X0) at z = 5cm and 10cm

no K and π identification, proton rejection via TOF

19k D+ + 42k D- 10 weeks data taking:

Open charm: benchmark for vertexing performance

D → K π π, cτ= 317 μm109 centr. ev.

eff = 2.6%

S/B = 2.4 (D-)

1.1 (D+)

D0 → K π, cτ= 123 μm1010 centr. ev.

eff = 4.4%

S/B = 6.4 (D0) 2.1 (D0)

_

and~ 6.4k D0 + 16k D0

ρ,ω,φ J/ψ

ρ, ω, φ J/ψ, ψ'

Signal and background yields from physics event generators (HSD, UrQMD) Full event reconstruction based on realistic detector layout and response

Feasibility studies for dileptons

Electron id:RICH and TRD

Muon id:segmented hadron absorber+ tracking system

125(225) cm iron,15(18) det. layers

π suppression:

factor 104

dominant background: e from π0 Dalitz

125 cm Fe: 0.25 ident. /event

dominant background: μ from π, K decay (0.13/event)

Hardware R&D

Large-area GEM as high-rate muon tracker(2 MHz cm-2)

Silicon microstrip detectors: double-sided, pitch 60 μm, stereo angle 15o, 300 μm thick,radiation-hard up to 1015 neqcm-2

Transition Radiation Detector with double sided pad-readout electrode. High efficiency for TR up to 250 kHz cm-2

High-rate timing RPC with semi-conductive glass or ceramics electrodes. Time resolution 80 ps,rate capability 20 kHz cm-2

Micro-vertex detector based on Monolithic Active Pixel Sensors

glassRICH mirror

Forward Calorimeter(lead/scintillator)

FrontEndBoards

self-triggeringread-out chip128 ch, 32 MHz(n-XYTER)

Where are we ?

feasibility studies physics performance simulations( ideal detectors ) ( realistic detector geometry and response)

small size detector samples demonstrator modules(rates, radiation hardness, ...) larges size detector with FEE

Milestones in 2009

Beam test experiments

High-rate RPCs with semi-conductive glass electrodes (built by Tsinghua Univ., USTC Hefei, China), April 2009 at GSI

Silicon micro-strip detectors, GEM detectors, RICH prototype, read out by free-streaming FEE and DAQ (German-Indian-Russian-Polish-Romanian collaboration), August 2009 at GSI

High-rate measurements with MWPC and RPCs at CERN

(muon beam and gamma source)

Simulations incl. realistic detector geometry (Collab. meeting in Oct)

CBM Timeline

2009 2010 2011 2012 2013 2014 2015 2016 2017

Simulations & analysis

Constr.+ test of demonstrators

R&D & constr. prototype det.

R&D & constr. prototype FEE

R&D & constr. prototype DAQ

Integration and system tests

Technical Design Reports

Detector/FEE construction

Detector/FEE installation

countries

Total declared contributions

Intendedapplications

for experiments

GuaranteedContributions to

experiments

China 12.000 1.600 1.600

France 18.000  n/a 0

Germany 705.000 78.382 25.137

India 36.000 11.649 5.800

Poland 23.740 7.970 5.700

Romania 11.780 4.000 4.000

Russia 178.050 54.000 17.663

Spain 19.000 6.065 3.000

Slovakia 12.000   0

Possible Consortium A      

Austria 5.000 5.000 2.500

Great Britain 8.000 8.000 7.000

Possible Consortium B      

Finland 5.000 1.300 1.300

Sweden 10.000 7.388 4.300

       

Italy 42.000  n/a  

Greece 4.000    

Slovenia 6.000    

sum 1.095.570 185.354 78.000

Experiment funding in the FAIR start version (to be decided by the ISC)

Experiments in the FAIR start version

ExperimentGesamtkosten CORE_E [k€]

Basiskosten innerhalb des Projektes

Deutsche Beteiligung inkl. Personalkosten [k€]

BMBFProjektmittel [k€]

%

PANDA 57.612 23.000 17.500 14.500 63

CBM 60.520 23.000 16.000 12.000 52

APPA 27.542 10.000 10.000 7.500 75

NUSTAR 54.489 22.000 15.000 8.000 36

Summe 205.132 78.000 58.500 42.000 54

CBM start version ?

HADES and CBM at SIS100Beams at SIS100:

11 AGeV Au, 14 AGeV Ca, 29 GeV p

Physics case:

In-medium properties of vector mesons

Nuclear matter equation-of-state

at baryon densities up to 6 ρ0

Properties of resonance matter

in the vicinity of the phase transition

Charm production mechanisms

at threshold beam energies

Charm propagation in nuclear matter

Multi-strange dibaryons ?

Measurements:

Dilepton pairs

Collective flow of hadrons

Multi-strange hyperons in A+A collisions

D-mesons and charmonium in p+p and p+A collisions

Experiments with a Au-beam up to 11 AGeV

Dielectron invariant mass spectra from central Au+Au collisions at 8 AGeVmeasured with HADES

ΩΛ Ξ Hyperon measurementsin central Au+Aucollisions at 6 AGeVwith CBM

Experiments with a 30 GeV proton beam

6 J/ψ recorded in 1010 events (b=0) (3·104 J/ψ per week)

p+C → J/ψ +X J/ψ → μ+μ-

p+C → D +X D → Kππ

STS with 10 microstrip stations St.1-2: strip pitch 25 μm, strip length 10 mmSt.3-8: strip pitch 60 μm, strip length 20-60 mm

1-2 day workshop in April 2009 on CBM physics at SIS100

1st CBM-Russia-JINR meeting in Dubna, May 19-22, 2009

3rd Meeting of the Russian/Ukrainian/German CBM-STS

Consortium in Karelia, Russia, June 1-4, 2009

14th CBM Collaboration meeting in Split, Croatia,

5. - 9. Oct. 2009

Upcoming meetings