Re: BB vertex vs MRS tracks

From: Stephen J. Sanders (ssanders@ku.edu)
Date: Wed Oct 24 2001 - 14:55:30 EDT

  • Next message: Djamel Ouerdane: "Re: BB vertex vs MRS tracks"

    Hi Djamel,
    Nice figures.   A question, however:   If I download the latest brag and 
    use it with the
    run 5326 calibration, does your last figure indicate that I will have to 
    apply an
    additional offset of 18.07 cm to get the correct BB vertex?
    
    ...steve
    
    
    Djamel Ouerdane wrote:
    
    > Dear Brahms'ers,
    > 
    > Flemming suggested I should check the correlation BB vertex vs TPM1 tracks 
    > rather than using the TPM1 track vertex.
    > 
    > In order to test also the new version of the tracking modules, I rather 
    > did the correlation with MRS tracks (less background). The result can be 
    > seen here:
    > 
    >   http://www.nbi.dk/~ouerdane/cal/BB.html#VTX2
    > 
    > There were no particular selections on the vertex range, the triggers were 
    > 1 and 4 (but biased by the presence of MRS tracks) and the BB vertex was 
    > the one given by the small tubes only. It was not corrected for the 
    > offset. The BB calibration used is in the rcas0005 database 
    > (run 5326).
    > 
    > Enjoy! :)
    > 
    > Ciao
    > Djam
    > 
    > 
    



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