Update of full silicon tracking Weiming Yao (LBNL) Silicon Tracker - - PowerPoint PPT Presentation

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Update of full silicon tracking

Weiming Yao (LBNL)

Silicon Tracker Study Meeting, Sept. 23, 2016

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Introduction

• Chengdong and I have checked the FTD construction

code seems OK (segment vs petal)

• After digi, the strip z or v position is reset to the center
• f strip, which causes them out of boundary.
• At the moment, the fiducial check is based on geometry
• f module, but it depends on actual hit position.

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Tracking Efficiencies vs eta

• Requiring PT > 1.0 GeV and in barrel and endcap overlap

region.

• Tracking eff improves after fixing the boundary and δ-ray

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Events 100 200 300 400 500 600 Found Tracks MC Theta

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Efficiency

0.85 0.9 0.95 1 1.05 1.1

(b) before

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Events 100 200 300 400 500 600 Found Tracks MC Theta

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Efficiency

0.85 0.9 0.95 1 1.05 1.1

(c) after

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Events 100 200 300 400 500 600 Found Tracks MC Theta

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Efficiency

0.85 0.9 0.95 1 1.05 1.1

(d) Without delta-ray

Figure: Efficiencies vs theta

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To-do List

• The full silicon tracking seems in a good shape.
• The digi and δ-ray is next to fix.
• Dan is starting to generate some zh events and the

results will follow.

• Instructions can be found at

http://cepc.ihep.ac.cn/ cepc/cepc twiki/index.php/Pure Silicon Detector.

• Given more layers of silicon, the tracking seems get

slower, about twice CPU time than CEPC V1.

• Will start to document the studies.