Nucleus-nucleus collisions at the future facility in Darmstadt -

Compressed Baryonic Matter at GSI

Outline:

Dense baryonic matter: fundamental physics Experimental observables Technical challenges and (possible) solutions

Peter Senger

States of strongly interacting matter

baryons hadrons partons

Compression + heating = quark-gluon plasma (pion production)

Neutron stars Early universe

Mapping the QCD phase diagram with heavy-ion collisions

B 6 0

B 0.3 0

baryon density: B 4 ( mT/2)3/2 x

[exp((B-m)/T) - exp((-B-m)/T)] baryons - antibaryons

Analysis of particle ratios with statistical model: chemical freeze-out

P. Braun-Munzinger

SIS300

Fundamental questions:

Equation-of-state at high densities: stability of neutron stars, supernova dynamics

In-medium hadron properties: chiral symmetry restoration, origin of hadron masses?

deconfinement

Statistical hadron gas modelP. Braun-Munzinger et al.

Nucl. Phys. A 697 (2002) 902

Experimental situation : Strangeness enhancement ?Experimental situation : Strangeness production

in central Au+Au and Pb+Pb collisions

New results from NA49 (CERN Courier Oct. 2003)

SIS100300

SIS100300

CBM physics topics and observables

1. In-medium modifications of hadrons onset of chiral symmetry restoration at high B

measure: , , e+e- open charm (D mesons) 2. Strangeness in matter (strange matter?) enhanced strangeness production ?

measure: K, , , , 3. Indications for deconfinement at high B anomalous charmonium suppression ?

measure: J/, D

softening of EOS

measure flow excitation function 4. Critical point event-by-event fluctuations

pn

++

K

e+

e-

p

Looking into the fireball …

… using penetrating probes:

short-lived vector mesons decaying into electron-positron pairs

Invariant mass of electron-positron pairs from Pb+Au at 40 AGeVCERES Collaboration S. Damjanovic and K. Filimonov, nucl-ex/0109017

≈185 pairs!

Signatures of the quark-pluon plasma ?

Anomalous suppression of charmonium (J/) ???

Charmed mesons

Some hadronic decay modes

D (c = 317 m):D+ K0+ (2.90.26%)

D+ K-++ (9 0.6%)

D0 (c = 124.4 m):D0 K-+ (3.9 0.09%)

D0 K-+ + - (7.6 0.4%)

D mesons not yet measured in heavy-ion collisions !

D meson production in pN collisions

Experimental challenges

107 Au+Au reactions/sec (beam intensities up to 109 ions/sec, 1 % interaction target)

determination of (displaced) vertices with high resolution ( 30 m)

identification of electrons and hadrons

Central Au+Au collision at 25 AGeV:URQMD + GEANT4

160 p 400 -

400 + 44 K+ 13 K-

The CBM Experiment

Radiation hard Silicon pixel/strip detectors in a magnetic dipole field

Electron detectors: RICH & TRD & ECAL: pion suppression up to 105

Hadron identification: RPC, RICH

Measurement of photons, π, η, and muons: electromagn. calorimeter (ECAL)

High speed data acquisition and trigger system

CBM R&D working packages Feasibility, Simulations

D Kπ(π)GSI Darmstadt, Czech Acad. Sci., RezTechn. Univ. Prague

,ω, e+e-

Univ. KrakowJINR-LHE Dubna

J/ψ e+e-

INR Moscow

Hadron ID Heidelberg Univ,Warsaw Univ.Kiev Univ. NIPNE BucharestINR Moscow

GEANT4: GSI

TrackingKIP Univ. HeidelbergUniv. MannheimJINR-LHE Dubna

Design & constructionof detectors

Silicon PixelIReS StrasbourgFrankfurt Univ.,GSI Darmstadt,RBI Zagreb,Univ. Krakow LBNL Berkeley

Silicon StripSINP Moscow State U.CKBM St. PetersburgKRI St. Petersburg

RPC-TOFLIP Coimbra, Univ. Santiago de Com.,Univ. Heidelberg,GSI Darmstadt,Warsaw Univ.NIPNE BucharestINR MoscowFZ RossendorfIHEP ProtvinoITEP Moscow

Fast TRDJINR-LHE, DubnaGSI Darmstadt,Univ. MünsterINFN Frascati

Straw tubesJINR-LPP, DubnaFZ RossendorfFZ JülichTech. Univ. Warsaw

ECAL ITEP Moscow GSI DarmstadtUniv. Krakow

RICH IHEP Protvino GSI Darmstadt

Trigger, DAQKIP Univ. HeidelbergUniv. MannheimGSI DarmstadtJINR-LIT, DubnaKFKI BudapestSilesia Univ. KatowiceUniv. Warsaw

MagnetJINR-LHE, DubnaGSI Darmstadt

AnalysisGSI Darmstadt,Heidelberg Univ,

Data Acquis.,Analysis

CBM R&D Collaboration : 39 institutions , 15 countriesCroatia:

RBI, Zagreb

Cyprus: Nikosia Univ.  Czech Republic:Czech Acad. Science, RezTechn. Univ. Prague France: IReS Strasbourg

Germany: Univ. Heidelberg, Phys. Inst.Univ. HD, Kirchhoff Inst. Univ. FrankfurtUniv. Mannheim Univ. MarburgUniv. MünsterFZ RossendorfGSI Darmstadt

   

Russia:CKBM, St. PetersburgIHEP ProtvinoINR TroitzkITEP MoscowKRI, St. PetersburgKurchatov Inst., MoscowLHE, JINR DubnaLPP, JINR DubnaLIT, JINR DubnaPNPI GatchinaSINP, Moscow State Univ.

Spain: Santiago de Compostela Univ.  Ukraine: Univ. Kiev

USA: LBNL Berkeley

Hungaria:KFKI BudapestEötvös Univ. Budapest

Italy: INFN CataniaINFN Frascati

Korea:Korea Univ. SeoulPusan Univ.

Poland:Jagiel. Univ. Krakow Silesia Univ. KatowiceWarsaw Univ.Warsaw Tech. Univ.  Portugal: LIP Coimbra

Romania: NIPNE Bucharest

EU FP6 Hadron Physics (2004 – 2006)

Joint Research Projects (approved):

• Fast gaseous detectors Partner: INVENTOR, Krakow• Advanced TOF Systems• Future DAQ and trigger systems (Silesia Univ. Katowice, Univ. Warszawa)

Network activities (approved):

• CBMnet (Silesia Univ. Katowice, Univ. Krakow, Univ. Warszawa)

CBM Participation in EU Programmes:

INTAS-GSI (2004-2005)

approved projects:

• Transition Radiation Detectors• Straw tube tracker (Univ. Tech. Warszawa)• Resistive Plate Chambers• Electromagnetic calorimeter (Univ. Krakow)

New call EU FP6 (opened Nov.03, closed Mar04):

• Design of new facilities • Construction of new facilities

HADES

CBM

The nuclear reaction experiment at the future facility at GSI

A+A at 2-8 AGeV

A+A at 8-40 AGeV