Exploring the phase diagram of strongly interacting matter
-
Upload
honorato-joyner -
Category
Documents
-
view
47 -
download
3
description
Transcript of Exploring the phase diagram of strongly interacting matter
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