[Primexd] Accidental background subtraction

[Igal Jaegle]

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.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/primexd/attachments/20200415/c409c5ff/attachment.html>