[Brahms-dev-l] FW: MRS momentum distribution

Hi BRAHMS,

  I am looking at the file

   /brahms/data02/data/run05/cucu/200/r12316/dst/dst012316v0p3.root
   Angle 90
   Field 1050

   Following Flemming's suggestion, I looked into the corresponding
gtr file:
===================
  /brahms/data02/data/run05/cucu/200/r12316/gtr/hist_gtr012316seq000v0p3.root

  KEY: TDirectory        Tracking_MRS;1    Tracking_MRS 
      KEY: TH1F             hMomentum;1           Accepted MRS tracks momentum
      KEY: TDirectory       Match_MRS;1    Match_MRS 
           KEY: TH1F      hMatchP_MRS;1           MRS Matching P (GeV/c)
           KEY: TH1F      hMatchPGood_MRS;1       MRS Matching P (GeV/c) Good Tracks
====================
I assume that the following correspondence is true

http://www4.rcf.bnl.gov/~tigist/MrsCheck/MRS_Accepted_P.gif            <------------>    MRS_fP
http://www4.rcf.bnl.gov/~tigist/MrsCheck/MRS_Matching_PGoodTracks.gif  <------------>   MRS_fD5_fP
http://www4.rcf.bnl.gov/~tigist/MrsCheck/MRS_Matching_P.gif     

Looking at these plots, it seems that the problem is while making the
dst files.

Selemon,

-----Original Message-----
From: Flemming Videbaek [mailto:videbaek_at_bnl.gov]
Sent: Thu 1/4/2007 10:31 PM
To: Bekele, Selemon
Cc: devlist
Subject: Re: [Brahms-dev-l] MRS momentum distribution
 
Hi

This is unusual, I have certainly not seen anything like that before. To check where stuff went bad, check the histograms in the gtr 
production (for Mrstracking and the refitting). In general the MRS.fP comes from the global track ie. refitting while the fD5.fP 
from the initial matching.
Hopefully this helps. Please when you send out pleas for help indicate what runs, and dst versions,, your are looking at.

Flemming

--------------------------------------------
Flemming Videbaek
Physics Department
Bldg 510-D
Brookhaven National Laboratory
Upton, NY11973

phone: 631-344-4106
cell:       631-681-1596
fax:        631-344-1334
e-mail: videbaek @ bnl gov
----- Original Message ----- 
From: "Bekele, Selemon" <bekeleku_at_ku.edu>
To: <brahms-dev-l_at_lists.bnl.gov>
Sent: Thursday, January 04, 2007 7:05 PM
Subject: [Brahms-dev-l] MRS momentum distribution


>
> Hi Brahms,
>
>    I started looking into the MRS spectra. I ran into
> a problem when trying to access the momentum distribution:
>
>  MRS_fP gives 0
>  MRS_fD5_fP gives both positive and negative values
>
> could this be a problem in the dst production?
>
> Please have a look at
>
>   http://www4.rcf.bnl.gov/~tigist/MrsCheck/
>
>
> Thanks
>
> Selemon,
> _______________________________________________
> Brahms-dev-l mailing list
> Brahms-dev-l_at_lists.bnl.gov
> http://lists.bnl.gov/mailman/listinfo/brahms-dev-l
> 



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