[Rgc_analysis] [EXTERNAL] FW: Second Pass Results for Raster Calibration

[Holmberg, Derek]

Hi everyone,

Sorry for spamming everyone's inbox, but I forgot to include the rgc analysis on my last email. I uploaded my slides to page of last week's meeting: https://clasweb.jlab.org/wiki/index.php/RGC_Jun20

The slides show my results from the updated analysis I had done, taking into account the additional cuts you all had recommended. As a quick summary, here are the additional cuts I had made:

  1.  A cut on [cid:image003.png at 01D9A822.32E2D060]
  2.  A cut of all data points separated by more than 1.25 cm from the center of the target
  3.  Various cuts on the "distance of separation" (which I just labeled as [cid:image004.png at 01D9A822.32E2D060] ) between the reconstructed particle vertices

I also found the residual standard deviation for each of the fits. However, while changing the cuts on the distance of separation seemed to affect the calibration constants by 5-10%, the residual standard deviation for each one was practically the same at 0.38cm. Given that the 2-sigma for the fits is around 0.75cm, would this detached vtx method be precise enough to be useful? My results certainly aren't gospel, and I'd love to hear your feedback.

When I performed the fits, I didn't include error bars on the individual vertex positions and just fit them as-is. Is that the correct approach? I just wasn't sure if we were going to have the analysis meeting this week because of the JLUO meeting.

Sincerely,
Derek Holmberg
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