Vector meson study for the CBM experiment at FAIR/GSI Anna Kiseleva GSI Germany, PNPI Russia Motivation The muon detection system of CBM Vector meson identification (ρ 0 , ω, φ, J/ψ) The low-mass vector meson problem (soft muons) acceptance of ρ 0 at MUCH possible solution preliminary results Outlook
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Vector meson study for the CBM experiment at FAIR/GSI
Vector meson study for the CBM experiment at FAIR/GSI. Anna Kiseleva GSI Germany, PNPI Russia. Motivation The muon detection system of CBM Vector meson identification (ρ 0 , ω, φ, J/ψ) The low-mass vector meson problem (soft muons) acceptance of ρ 0 at MUCH - PowerPoint PPT Presentation
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Vector meson study for the CBM experiment at FAIR/GSIAnna Kiseleva GSI Germany, PNPI Russia
Motivation
The muon detection system of CBM
Vector meson identification (ρ0, ω, φ, J/ψ)
The low-mass vector meson problem (soft muons)
acceptance of ρ0 at MUCH
possible solution
preliminary results
Outlook
Dilepton Sources in Heavy-Ion Collisions
Dilepton Sources in Heavy-Ion Collisions
Signatures of the quark-gluon plasma:anomalous suppression of charmonium
In-medium spectral function using penetrating probes
D.Adamova et al., PRL 91 (2003) 042301
Calculations by R. Rapp:
thick dashed line: unmodified rho
thick dashed-dotted line: in-medium dropping rho mass
thick solid line: in-medium spread rho width
Di-electron measurements (CERES/CERN)
Di-electron measurements (CERES/CERN)
5-week-long run in Oct.–Nov. 2003 ~ 4 × 1012 ions delivered in total
STS: track and vertex reconstruction RICH: electron identification.TRD: identification of high-energy electronsRPC-TOF: time-of-flight measurement ECAL: electron and photon identification
TRD1
A+A collisions at 10 – 45 AGeV
CBM detector: μ+μ- setupCBM detector: μ+μ- setup
ECALTOFTRD3TRD2
STS
MUCH
TRD1
MUonCHamber system (MUCH)MUonCHamber system (MUCH)
Fe C
5 10 20 30
120 cm
STS
First design study absorbers:
4 Fe + 1 C increasing thickness full thickness ~ 1m Fe
detectors: 2 layers between absorbers 1 – in front of MUCH 2 – behind last absorber
TracksTracks
π-
π+1 central Au+Au event at 25 AGeV beam energy(top view of the STS + MUCH system)