GOAL : reevaluate the efficiency for the run 7, by looking at the ratio of primary tracks which have silicon hits.

This can be used for :

• choosing a list of runs needed for embedding
• making a 'golden' list

The method used :

1. loop over primary tracks with some cuts (quality cuts)

• pT>.1,
• ratio TPC hits fitted/TPC hits possible > .51, 
• |eta|<1.2,
• |zvertex|<10 cm

     2. fill histograms in (eta,phi) for these tracks : no cuts here (histo a)

     3. fill similar histograms but requiring different combinations of silicon hits 

• ssd in (histo b) :
  •    svt =0
  •    svt =1
  •    svt =2
  •    svt =3
• ssd out (histo c) :
  •    svt =0
  •    svt=1
  •    svt=2
  •    svt=3

     4. make some ratios bin-by-bin (histo d and e)

At this point, the binning of the histos are :

• 32 bins in phi btw -3.2 and 3.2
• 24 bins in eta btw -1.2 and 1.2

The choice is purely arbitrary, but the next steps is to apply detector segmentation in (phi,eta)

     5. Repeat this as a function of time 

comments : for now I used files on RCF so not all days are covered --> next steps are to do this on the run number (not day) level

RESULTS

1. histogram a : all tracks from TPC

             2.  histogram b : case when tracks have SSD hit

          3.  histogram c : case when tracks have no SSD hit

     4.  histogram d (ratio histo b with histo a) and histo e (ratio histo c and histo a) 

Then the ratio for all different cases and for different days is below :

DETAILS DAY BY DAY

In this part I have run over files from run numbers in a given day: the idea is to look at the stability of these ratios on a run number basis

day 104 :

day 105 :

day 109 :

day 127 :

D0/D0bar embedding new sample (1/11)

Each pdf has 5 slides :

• slide 1 : inv mass for different cuts
• slide 2 : eta-phi distribution of MC tracks for SVT=0,1,2,3 AND SSD=0
• slide 3 : eta-phi distribution of MC tracks for SVT=0,1,2,3 AND SSD=1
• slide 4 : eta-phi distribution of RC tracks for SVT=0,1,2,3 AND SSD=0
• slide 5 : eta-phi distribution of RC tracks for SVT=0,1,2,3 AND SSD=1

Files are from directories :

/eliza15/star/starprod/embedding/2007ProductionMinBias/D0_[700,710,720]/P08ic.SL08c/st_physics_*minimc.root

1. D0 for directory 700
2. D0 for directory 710
3. D0 for directory 720
4. D0bar for directory 700
5. D0bar for directory 710
6. D0bar for directory 720

Update on (in)efficiency :

cuts have slightly changed :

• nTPC fitted > 15
• pt>.1 AND pt<10

• UPDATE (5/17) : FINAL PLOTS

inefficiency vs day number (all Pt tracks) :

inefficiency vs day number (0<Pt <0.5 GeV/c tracks) :
 

details of (eta,phi) map for each day for configs SSD=0 and SVT=0,1,2,3 pdf

details of (eta,phi) map for each day for configs SSD=1 and SVT=0,1,2,3 pdf