D Upgrade

1
DÆ Upgrade
11
2
DÆ Upgrade Tracking

• Silicon Tracker
• Four layer barrels (double/single sided)
• Interspersed double sided disks
• 793,000 channels
• Fiber Tracker
• Eight layers sci-fi ribbon doublets (z-u-v, or z)
• 74,000 830 mm fibers w/ VLPC readout

1.1
cryostat

• Central Preshowers
• Scintillator strips, WLS fiber readout
• 6,000 channels
• Forward Preshowers
• Scintillators trips, stereo, WLS fiber readout
• 16,000 channels
• Solenoid
• 2T,superconducting

1.7
12
3
Tracker Performance

• Tracking
• momentum resolution significantly enhanced
• secondary vertexing capability with silicon Þ
  tag b-quark decays
• sign determination for electrons
• Preshowers
• enhanced e-ID (central forward)
• forward e-triggering additional x3-5 rejection
• Muons scintillators
• ? detection threshold Pt? 3.5 ? 1.5 GeV/c

13