Re: [Brahms-dev-l] RICH Calibration

if you look at R vs p for run 12376 the low P should be >8 if you need  
more events read the next dst
On Jan 30, 2007, at 2:11 PM, Bekele, Selemon wrote:

>
> 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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> Brahms-dev-l_at_lists.bnl.gov
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