Detector Characteristics Requested by FCC-ee

Basic geometry:

Radius of tracking system

Vertex Detector

  • Barrel: 3 double layers Pixels with 3 micrometer resolution
    • Rin = 30.825 mm
    • Rout= 60 mm
    • MaxZ= 130 mm
  • Endcap: Double layers where petals are arranged in a "Spiral" geometry. Pixels with 3 micrometer resolution
    • Min z: 160 mm
    • Max z: 298.8 mm
    • Min r: 33 mm
    • Max r: 102 mm
    • Dz between first and last sensitive layer: 136 mm
    • Petal angle: 45 degree

Silicon Tracker:

Technology not decided yet, should be either "large" pixels or short strips, or a combination of the two. Will comprise an “Inner Tracker” and an “Outer Tracker” in the barrel.
  • Rin=61 mm
  • Rout=1500 mm
  • MaxZ = 2345 mm

Length of magnetic field coverage

  • Solenoid:
    • Rin = 3440 mm
    • Rout = 4304 mm
    • MaxZ = 4129 mm

Magnetic filed intensity:

    • Field on central axis = 4 T

Tracking coverage in eta/theta,

Eta/phi granularity of hcal and ecal

  • ECal: 5.1 mmx 5.1 mm cells (Silicon)
  • HCAL: 30 mm x 30 mm cells (Scintillator)

Momentum resolution formula for charged tracks

$ p_T/p^2_T \sim 2 \times10^{-5} \mathrm{GeV}^{-1}$

energy resolution for electrons and photons

momentum resolution for muons

$ p_T/p^2_T \approx 2 \times10^{-5} \mathrm{GeV}^{-1}$

impact parameters resolution

$ \sigma_{d0}^2 = a^2+ (b^2)/(p^2 \sin^3\theta) $ Where $ a\leq 5 \mu m$ and $ b \leq 15 \mu m$ (Design CDR)

identification and mis-idenfication efficiency for particles: muons, electron, pions, kaons, ...

MUONS: CDR page 150 Isolated muons: efficiency: ~100% for theta>10 deg, purity ~100% Muons in jets: efficiency ~90 & for theta>10 deg, purity ~95%

neutral hadron energy fraction lost in hcal and ecal (sum =1)

energy resolution formula for jets

b-tag efficiency (optional)

-- NikiforosNikiforou - 2015-05-06

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Topic revision: r2 - 2015-06-17 - NikiforosNikiforou
 
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