1. Hough 工作进展

2. Outline Track efficiency improvement when |cos|>0.8
Pipijpsi MC tracking efficiency check
D->kpipipipi0
Next ->fit? Genfit?

3. Tracking efficiency when |cos|>0.8
Update in Algorithm
Get back lost stereo hits after hough transform
Delete bad hit in calculate zPosition and flightLength of stereo hits
Use only inner chamber hits in “zsFit” to get a initial parameter for global fit(
outer chamber seems not accurate of zs calculation of stereohits , imperfect)
Delete hit when “driftTime”<0

4. Tracking efficiency with single pion
No kalman filter , cutpt+cutp+cutd0+dutdz
Before update
After update
63.07%
67.07%
After kalman filter , cutpt+cutp+cutd0+dutdz
Before update
After update
75.16%
77.78%

5. Pipijpsi MC check Before upgrade
About ~1% improvement when low pt combined with old HOUGH
After upgrade

6. D->kpipipipi0 Simulate D0->k- pi+ pi- pi+ pi0
Check pt information
Pt of all charged track (pion , kion )
(GeV)
Pt(50MeV~120MeV): 6932/41414=16.7%

7. D->kpipipipi0 Method :
Simulation: D0->Kpipipipi0, other side D0->all channel
Reconstruction and analysis results not discussed with physics parterner

8. Some addition and problem
Uniformed and inuniformed magnetic get large difference in efficiency(~20%) after tracking (before kalman)
Use truth of 3d parameter as input for global fit can update ~1% in efficiency
Problem with |cos| small , in multiple turn tracks , hits in 2nd(3st..) easily come into track , but calculate wrong flightlength both in calculate z-s of stereo hits & global fit

9. Next to do To amend tracking parameter in Hough Space
Is it time to introduce genfit for fitting ?