1. Hough-4-14

2. Outline Solve memory leak problem The D->Kpipi from last week
Tracking efficiency with combined tracking without inner chamber
First try the easy method on stereo wire

3. Memory leak problem in data
Valgrind to check
Track pointer not delete
in root fitting
A whole raw file reconstructing won’t fail
Submit one week data to reconstruction(not finish)
One day’s data has not enough low pt events

4. D->kπ π Last week work by check
Something error in analysis code ->make 100% efficiency of D
one pattsf.txt job is failed in background , make it 5% signal lose
After fix these problem , nearly signals by PATTSF & PATTSF+HOUGH(~50% efficiency ,coincide with physics report)
Check track momentum , not much low pt track in D->k π π
A track pt distribution from D->kpipi
GeV
GeV

5. Check with no inner chamber
Data sample:
MC single muon fixpt
10,000 events
Non uniformed magnetic
Mix background in reconstruction
Reconstruction method:
PATTSF+HOUGH
PATTSF

6. Check with no inner chamber
Efficiency definition: events at least find 1 track/all events
(above 250MeV) , open to reconstruct higher pt for Hough)
50MeV
75MeV
100MeV
150MeV
250MeV
500MeV
1GeV
PATTSF ~0
~1%
41%
93.7%
~95%
~96%
PATTSF+HOUGH
~2%
52%
86%
95%
Hough now hardly take back higher pt without inner chamber

7. Method to deal with stereo hits
From big angle track (|cos|>0.8) , 2d fitting performs good ,
most lost track are due to stereo hits loss
We can use 2D information to collect stereo hits that near to the circle track
some cut condition is under studying