• Reports from those who looked at the bins (thanks!):
  

  pT \ p	1-2	3-6	10-15	20-30	30-50
  0.0-0.2	Ferenc	Claudia	Gábor	Dezsõ	Ferenc
  0.3-0.5	Ferenc	Ferenc	Dániel pos neg	Ferenc	Dezsõ
  0.7-0.9	Ferenc	Dániel pos neg	Ferenc	Dezsõ	Dániel pos neg
  1.1-1.3	Claudia	Ferenc	Dezsõ	Dániel pos neg	Hans-Gerhard
  1.5-2.0	Ferenc	Dezsõ	Hans-Gerhard	Dániel pos neg	Hans-Gerhard

  
  
  
• Summary
  • bad iflag!=0 tracks [positives/negatives %]
    

    pT \ p	1-2	3-6	10-15	20-30	30-50
    0.0-0.2	11/6	11/9	11/11	36/7	47/
    0.3-0.5	11/15	8/7	13/1	21/3	47/19
    0.7-0.9	34/41	5/	17/21	22/21	29/
    1.1-1.3	92/100	33/44	32/20	15/15	36/21
    1.5-2.0	100/100	57/84	47/73		56/56

    
    
    
  • good split tracks [positives/negatives %]
    

    pT \ p	1-2	3-6	10-15	20-30	30-50
    0.0-0.2	1/0	4/3	1/1	2/2	7/9
    0.3-0.5	5/3	5/4	1/6	3/5	0/1
    0.7-0.9	15/9	1/	4/7	2/8	2/
    1.1-1.3	-	often	10/5	2/7	2/10
    1.5-2.0	-	1/1	2/0		-

    
    
    
  • Impact parameters:
    They must not be used for cuts.
  • Split tracks:
    This is the major problem that has to be cured first.
  • Iflags:
    Tracks with iflag!=0 should be rejected.
  • Potential points:
    They should be used to select good tracks. In order not to lose particles that decay later, a/p=(x%,0%,0%) or (x%,x%,0%) should be accepted. The potential points calculation seems to use the global rtrack trajectory: it should be calculated for the global track fitted with vertex constraint. The calculation has problems at the corners of VTPCs and the top/bottom plane of the TPCs: try to get this or even the geometrical acceptance from data.
  • Lost points:
    Points are lost overall, regardless of momentum. They should be attached to the track allowing better dE/dx performance.
  • 'Spirals' in vt1:
    Some low momentum vt1 track are treated as spirals. In there case it is normal that they change z direction, so one should recover them, because - among others - they are important for sharper CD definition and the backward acceptance can as well be enlarged.