Re: [Brahms-dev-l] RICH Calibration

Hi,

   I have been trying to do the RICH
calibration for CuCu at 200 GeV. I have 
some plots at

http://www4.rcf.bnl.gov/~tigist/RichCalibration/12376/
http://www4.rcf.bnl.gov/~tigist/RichCalibration/13175/

   There is a low momentum cut on the particles to be
used in the calibration. All particles with radius > 0
have been used. I am trying to get Rmeas-Rcal to be
 accurate at the 10^(-4) level. I could pick the low
momentum cut off based on the width (sigma) of the
Rmeas-Rcal distribution, which would mean more events
to process to boost statistics and hence more time.

4A861, run 12376  , 3 Gev/c < FS.fP < 15 GeV/c (from the momentum distribution at this setting)

*************************************************************************
low p cutoff      RefIndex        Mean of Rmeas-Rcal Dist.     Sigma 
[GeV/c]
-------------------------------------------------------------------------
3                  1.0018857        5.87464581e-05            0.11228228
4                  1.0018857        9.77900318e-05            0.112305069
5                  1.0018872        1.0220984e-05             0.110049792
6                  1.00189087      -9.3096992e-05             0.110100954
7                  1.0018922       -4.55340105e-05            0.109223706
8                  1.00189387      -8.61700281e-05            0.115702621
9                  1.0018923       -6.43854182e-05            0.124331258
10                 1.00188805       0.00026958554             0.124616478
**************************************************************************


4A3450, run 13175  , 16 Gev/c < FS.fP < 36 GeV/c (from the momentum distribution at this setting)

*********************************************************************
low p cutoff     RefIndex        Mean of Rmeas-Rcal Dist.    Sigma 
[GeV/c]
---------------------------------------------------------------------
16                1.00185164      6.72172235e-05         0.117973537
17                1.0018518      -4.9516019e-05          0.117879671
18                1.00185259      8.67652078e-05         0.117719077
19                1.00185445     -8.99262219e-05         0.114676964
20                1.0018547      -8.14822908e-05         0.113617438
*********************************************************************



  It would be quite helpful if the RICH experts can comment 
on this. With code (Thanks Ramiro and Flemming) set up the
 way it is now, it takes about one hour, via condor, to 
process all the CuCu runs for one momentum cutoff.


Selemon,


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