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Status of MuCh simulations at CBM. Anna Kiseleva. Outline. Muon measurements at CBM Segmentation of muon system Time measurements Next steps. CBM 2006. STS MuCh TRD ToF. CBM Collaboration Meeting Febr. 2007. Mu on Ch ambers.
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Status of MuCh simulationsat CBM Anna Kiseleva
Outline • Muon measurements at CBM • Segmentation of muon system • Time measurements • Next steps
CBM 2006 STS MuCh TRD ToF CBM Collaboration Meeting Febr. 2007
Muon Chambers 20 20 20 30 35 cm Fe Fe Fe Fe Fe 260 cm 5 cm 0 cm 102.5 cm
Hard muon tracks μ+ ρ μ-
Parameters of detectors 2006 • STS: • stsDigiVersion = "v05a" • 2 hybrid + 4 strip detectors • MuCh: • 100 μm space resolution • 80 πsec time resolution • ToF: • 6 mm 7 mm space resolution • 80 πsec time resolution
Results from Coll. Meet. Febr.07 hard-hard pairs without cuts ————— S/B ratio ——————————————————————— ω φ η ηDalitz ρ ω φ η ηDalitz ρ = 0.2 = 0.05 = 0.004 = 0.05 = 0.003 = 2.6 = 5.2 = 1.2 = 0.3 = 2.2 [0.2; 0.3] GeV/c2 [0.2; 0.9] GeV/c2 ————— Efficiency (%) —————————————————————
CBM 2007 STS MuCh ToF
Parameters of detectors 2007 • STS: • STS digitizer • 6 strip detectors • MuCh: • MuCh digitizer • 80 πsec time resolution • ToF: • 6 mm 7 mm space resolution • 80 πsec time resolution
Detector segmentation min pad 1.4 2.8 mm2 space resolution: x – 400 μm, y – 800 μm 5% occupancy max pad 44.8 44.8 mm2 space resolution: x – 12.8 mm, y – 12.8 mm Mikhail Ryzhinskiy, Saint-Petersburg State Polytechnical University
Results hard-hard pairs 100 μm new ————— S/B ratio ——————————————————————— ω φ η ηDalitz ρ ω φ η ηDalitz ρ = 0.2 = 0.05 = 0.004 = 0.05 = 0.003 = 2.6 = 5.2 = 1.2 = 0.3 = 2.2 = 0.07 = 0.02 = 0.002 = 0.02 = 0.001 = 2.4 = 4.8 = 1.0 = 0.2 = 2.0 [0.2; 0.3] GeV/c2 [0.2; 0.9] GeV/c2 ————— Efficiency (%) —————————————————————
Reconstructed bg —μ —π —Κ —p —ghost
Weak decays absorber pad
Weak decays absorber pad
Ideas of new possibilities • set min space resolution: • for X and Y separately • for each detector triplet • set angle of detector rotation
—μ —π —Κ —p —ghost Reconstructed bg
Time measurements P = mμ × β × γ β = , t - time γ = L (L, t) c × t 1 √1 – β2 STS MuCh ToF (L, t) PSTS
Comparison time measurement at the 3 m time measurement at the 10 m signal μ bg μ signal μ bg μ PToF π K π K p ghost p ghost PSTS
time information —μ —π —Κ —p —ghost —μ —π —Κ —p —ghost Reconstructed bg cut of Pmuon ToF
—without cut —with cut of Pmuon ToF —with cut of PToF Reconstructed signals
Results hard-hard pairs without PmuonToF PToF cuts cut cut ω ω = 0.06 = 2.4 = 0.14 = 2.1 = 0.14 = 1.2 ————— S/B ratio ———————————————————— ————— Efficiency (%) ——————————————————
Detector requirements • high rate capability (up to 1 MHz/cm2) • high granularity (up to 1 hit/cm2s-1 for central Au+Au collisions) • position resolution < 300 μm • 3 space points between absorbers • full detector thickness < 5 cm • possibility of the time measurements
Next steps • Continue of the detector space resolution study • Optimization of ToF for the muon measurements