1. RIKEN VTX software Meeting
Software Update
Takashi HACHIYA
RIKEN
2012/3/15
RIKEN VTX software Meeting

2. Reported at Analysis Meeting
Calibration readiness and recalibrator
Not ready for Hot/Dead map (no H/D map for many runs)
Not ready for geometry (now final checking)
Not ready for Beam center (need to scan)
Contact parson : Takashi
Software Development
We are discussing about CNT based tracking
Chi2 problem
Background estimation
Photon Conversion tagging
I answered that we need 2 weeks to converge the discussions
2012/3/15
RIKEN VTX software Meeting

3. Request for test/calibration production
We would like to request a test/calibration production for VTX
Purpose：
Hot/dead map (pixel and strip)
Beam Center calibration
1 PRDF file for all “good” runs after the last (4th) repair (Run )
VTX Code is ready
We needs some more work for full VTX production but the current code is good enough for the test production
Based on the hot/dead map generated in the test production, we will finalize the good run list for the full VTX production.
Less than 1 week after muon production
Prepare the macro and code until then.
Hot&Dead Map (SvxDstQA and SvxFillHistoPixel, SvxStripFindHotDead)
Beam Center (??)
Geometry Alignment ??
QA for Cluster, SATrack and CNT based Tracking, RP
2012/3/15
RIKEN VTX software Meeting

4. RIKEN VTX software Meeting
Status of Good Run List
Making the good run list is in progress
Good run list :
After 4th repair (Run ) runs (3.3B Evts with no trg cut)
Mark < 4
mark is a flag showing the data quality put by the shift crew.
Based on the hot &dead map for the pixel
2nd good run candidate
Between 3rd and 4th repair (Run )
We have Hot&Dead Map for 113 runs (out of 333, 34%)
Snapshot of good run list
See the excel file
Good Run
Warning Run
Bad Run
RunNumber
NBadChip (out of 480)
347248
138
347249
136
347256
279
347261
201
347795
144
347799
140
347800
122
2012/3/15
RIKEN VTX software Meeting

5. RIKEN VTX software Meeting
Plan for JPS
Algorithm discription
SATracking
CNT based Tracking
Primary Vertex Measurement
Need the input from Akimoto-kun what the equation is used for the calculation
Plot
efficiency and purity
Momentum Resolution of SATracking
Beam Profile and width
Hadron DCA distribution & (electrons?)
(Centrality dependence of DCA resolution)
2012/3/15
RIKEN VTX software Meeting

6. Momentum Resolution of SATrack
(SAT-CNT) (GeV/c)
(SAT-CNT)/pT(CNT)
CNT_pT (GeV/c)
CNT_pT (GeV/c)
Momentum resolution
Associate SATrack with CNTTrack using phi0 and the0 matching.
Only west arm is used
Different of measured pT between SAT and CNT
Width is fit by Gaussian and pol2
See backup
SATrack resolution is similar with the simulation
Need to subtract the CNT resolution
VTX p resolution(sim)
DC p resolution
2012/3/15
RIKEN VTX software Meeting

7. RIKEN VTX software Meeting
Chi2 problem
Apply Chi2 cut makes the 50% track loss
Suggestion
Adding a status word showing the hit in each layer is unique or not (1 is unique, 0: multiple or nohit)
Unique = 0b_XXXXXXXX
(8bit word, MSB-LSB=(B3(7,6,5),B2(4,3,2),B1,B0)
2012/3/15
RIKEN VTX software Meeting

8. RIKEN VTX software Meeting
Run 12 hitmap list
Hitmap for each runs in run12 is updated
2012/3/15
RIKEN VTX software Meeting

9. RIKEN VTX software Meeting
Problems
In run 11
We have a problem on the Small Nhit w.r.t BbcCharge in the hit correlation. This may cause the MB selection.
In Run 12 production, PrimVertex reconstruction is very low efficiency reported by John (chen) and Melynda
Reconstruction efficiensy is less than 1%
I asked John to investigate it using the event display
2012/3/15
RIKEN VTX software Meeting

10. Snapshot of Simulation study
CNT_Reco_pT(GeV/c)
sim_pT(GeV/c)
All
DC quality(31or63)
All
Nassociated>=3
CNT_Reco_pT(GeV/c)
sim_pT(GeV/c)
There is 2 lines in the correlation, but requiring the track quality or nhit>=3, the second line is disapeared.
The track in the second line might be a ghost or so (kicked track due to multiple scattering?)
Simulation data
2012/3/15
RIKEN VTX software Meeting

11. Snapshot of Simulation study
Y of origin (cm)
Y of origin (cm)
X of origin (cm)
X of origin (cm)
Most of the particles comes from the primary vertex
Red point at (0,0)
But some particles comes far from the p-vtx.
Beam pipe and VTX structure is seen
Nhit>=3 is required in the plot.
We can measure particles after bending by multiple scattering and so on.
2012/3/15
RIKEN VTX software Meeting

12. RIKEN VTX software Meeting
DCA distribution
All
chi2(dp)<10
All
chi2(dp)<10
The chi2 cut artificially choose the DCA around zero.
2012/3/15
RIKEN VTX software Meeting

13. RIKEN VTX software Meeting
DCA vs dphi3
All Tracks
Chi2(dphi)<10
DCA
DCA
dphi3
dphi3
2012/3/15
RIKEN VTX software Meeting

14. RIKEN VTX software Meeting
dphi3 vs dphi0
dphi3
dphi3
All track
Chi2(dphi)<10
dphi0(cm)
dphi0(cm)
Chi2 cut choose green band, but actual correlation is with in the red band
2012/3/15
RIKEN VTX software Meeting

15. DCA Comparison between Reco. and Sim.
RecoDCA(cm)
Improbed RecoDCA(cm)
SimDCA(cm)
SimDCA(cm)
SimDCA is calculated by the GEANT info
p vector at origin and the origin point.
Reco. DST is much narrower than before the improvement
No strange correlation in SimDCA
2012/3/15
RIKEN VTX software Meeting

16. RIKEN VTX software Meeting
backup
2012/3/15
RIKEN VTX software Meeting

17. Association SATrack with CNT
Use west
|dphi|<0.03
Phi0(CNT) – phi0(SAT)
Phi0(CNT) – phi0(SAT) Corrected
Phi0(CNT)
Phi0(CNT)
|dthe|<0.01
the0(CNT) – the0(SAT)
dpT(SAT-CNT) (GeV/c)
charge*CNT_pT(GeV/c)
2012/3/15
RIKEN VTX software Meeting

18. Association SATrack with CNT
dpT(GeV/c)
dpT(GeV/c)
dpT(GeV/c)
dpT(GeV/c)
dpT(GeV/c)
dpT(GeV/c)
dpT(GeV/c)
dpT(GeV/c)
dpT(GeV/c)
2012/3/15
RIKEN VTX software Meeting

19. Algorithm : Track Association to VTX hit
CNT track
Actual Track B3 B2 B1 B0
dphi range
dphi3
dphi2
Algorithm : Track Association to VTX hit
Use CNT track as a seed.
Search for the associated hit at the outer layer.
loose cut for large DCA
Search for the next associated hit using the residual correlation.
Choose the “Good” associated hits using the least chi2.
dphi3 vs dz3
dphi3 (cm)
dz3 (cm)
1cm
dphi3 (cm)
dphi2 (cm)
5mm
1mm
𝜒 2 = 𝑑𝑝ℎ𝑖′ 𝜎 𝑝ℎ𝑖 𝑑𝑧′ 𝜎 𝑧 2
𝑑𝑝ℎ 𝑖 ′ =𝑑𝑝ℎ 𝑖 𝑖 −𝑑𝑝ℎ 𝑖 𝑗
𝑑 𝑧 ′ =𝑑 𝑧 𝑖 −𝑑 𝑧 𝑗
2012/3/15
RIKEN VTX software Meeting

20. RIKEN VTX software MeetingB0
Center of B bending
Track vector
DCA0
DCA calculation
1) DCA0 calculation
DCA0 is calculated using
track vector at B0 hit
Track is bent by B-field.
Based on the vector, track trajectory is calculated as a circle.
DCA0 is calculated.
2-1 DCA0 can be improved using the outer layer hit
2-2 DCA0 can be improved by refitting with Kalman Filter method
Matt is working
Associated cluster is kept in the DST.
2) Further improvement of DCA (in progress)
DCA0
DCA
Measured vector at DCH
DCH B0
True track vector B3 l3 l0
2012/3/15
RIKEN VTX software Meeting

21. RIKEN VTX software Meeting
Status of Software
Software development for the production is in progress
SvxCentralTrackReco:
We are still discussing about the following items at the VTX software meeting.
Tracking Algorithm (Chi2 cut)
Background estimation of the random association
Photon conversion tagging
We need more time to converge the discussion.
Reaction Plane Calculation (Q vector calculation)
Ready.
Software for recalibrator
Reaction Plane calculation with correction (re-centering, flattening)
Kalman Filter for refitting the track with associated hits.
Alignment for chi2 calculation and so on
Momentum recal.
These modules are now under development
2012/3/15
RIKEN VTX software Meeting

22. Status of Calibration/Recalibrator
Items
Stage
Status
Description
Who
Pixel HotDead
Before Production
Done
H Sako
Strip HotDead
in progress;
only a few runs are done
Rachid
Geometry
Alignment
1st version (almost) done; needs confirmation for several runs
Hidemitsu Maya Mikhail
BeamCenter&Offset
code ready; done for a few runs; needs 1PRDF/run for pre-production
Hidemitsu Takashi
Bad data check
During production
Code ready
Bad event due to locking the cellID. This happens at the end of Run
Akitomo
dE/dx
not ready; Plan B is to do it in a recalibrator
Alex Shaver
RP(VTX)
Recalibrator
code to store Q-vectors ready.
Calibration(re-centering/Flattening) code is in progress.
Nakagomi
Esumi
Kalman Fit
not ready
Matt Wysocki
momentum recalib
for SAT
not started yet. We can develop the recalibraotr for this during the production
recalibrate momentum of StandAlone track using Dch track
TBN
Geometry Alignment(2)
recaliculate/fine tune dphi, dz
2012/3/15
RIKEN VTX software Meeting

23. Status of Calibration used for the production
Contact person : Takashi HACHIYA (RIKEN)
Status
Hot&Dead map
Pixel is almost ready (done for run by run hot/dead map)
Strip is in progress( currently one hot/dead map)
Input : Rawhit
Beam Center calibration
Need to scan the run before full production starts.
1 PRDF for 1 run is good for Beam Center calibration
Input: Primary vertex by SATrack
Geometry Calibration
1st version is done
Need to check if 1st version works for the other run.
Input: Cluster in VTX and CNT track
Code for the Calibration
Basically in the CVS, but in the private area (offline/analysis/…)
2012/3/15
RIKEN VTX software Meeting

24. Request for test/calibration production
We would like to request a test/calibration production for VTX
Purpose：
Hot/dead map (pixel and strip)
Beam Center calibration
1 PRDF file for all “good” runs after the last (4th) repair (Run )
VTX Code is ready
We needs some more work for full VTX production but the current code is good enough for the test production
Based on the hot/dead map generated in the test production, we will finalize the good run list for the full VTX production.
2012/3/15
RIKEN VTX software Meeting

25. RIKEN VTX software Meeting
Test Production
I requested the test production for
HotDead Map for Pixel and Strip
Beam Center Calibration
Good RunList
Test production
1 PRDF for every run after 4th repair
Need to prepare the production macro with calibration (QA code)
Hot&Dead Map (SvxDstQA and SvxFillHistoPixel, SvxStripFindHotDead)
Beam Center (??)
Geometry Alignment ??
QA for Cluster, SATrack and CNT based Tracking
Hot&Dead Map Status
We have Hot&Dead Map for 113 runs (out of 333, 34%)
We need to make H&D Map for these runs before the production starts
2012/3/15
RIKEN VTX software Meeting