[Primexd] Accidental background subtraction

[gasparan at jlab.org]

  Hi Igal,

 That is a great job, I was expecting that result!

 Thanks,
 Ashot


> All,
>
> The subtraction of the accidental background has a dramatic effect and
> appears to be necessary for the proper FCAL energy calibration of the
> PRIMEX data. In short, all pi0's mean in the inner rings got shifted to
> lower mass after the accidental background subtraction. In short, if the
> accidental coincidence is too large, I believe it is almost impossible for
> a fit to capture the real pi0 mean particularly with bkg with large
> "slope".
>
> Matt, I will not be able to attend the CAL meeting tomorrow but I will
> present my observation at the PRIMEX meeting this Friday.
>
> tks ig.
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