dE/dx calibration of Y2001 data (progress report)

1. Data sample
2. dE/dx resolution after pulser corrections only.
3. Time dependence (done)
4. Sector and Row dependence (almost done)
5. Sector and Z dependence (in progress)
6. pile-up and volume charge (not yet)

Data sample

• Each 10-th file (/reco/*/*/P01gk/*/*/*0010.dst.root)
  for 680 runs in total
  on disks: data18, data20 and data21,
  i.e. all runs processed so far excluding Field Off data.
  The pulser gain correction (Fabrice) has been included.
• it is used global tracks with no. of fit points ≥ 30 ==> ~75 M tracks;
• z = < log(dE/dx) - log(dE/dx)(BB for pion)> == profile histograms
• <z> should be = 0. It is not 0 yet ! The overall scale will be set after all calibration step completion.

dE/dx resolution after pulser corrections only.

Resolution at 90cm = 8.7%.

Time dependence

Overall scale is about exp(-0.1). There are 3 runs with very high scale (scale > 0.5) and many runs with scale < -0.2.
The result for these runs have to understood and the runs have to excluded from analysis.

Sector and Row dependence

It is needed one more iteration.

Sector and Z dependence

Result for inner and outter sector

Dependence on no. of global tracks(pile-up and volume charge)