[Sbs_gems] [EXTERNAL] Negative Pulse Analysis Update

[Sean Jeffas]

Hi All,

I touched up my negative pulse analysis results that I showed to everyone
last week. I realized I was making a serious mistake by simply cutting on
signal > 80 ADC, because the first few strips in the APV always have large
signals on them from the event header. Therefore this was significantly
skewing my data. I am now using the correct method of cutting using 5*sigma
of the pedestal noise, as is done in the tracking analysis.

Please see my new results in the following slides
https://logbooks.jlab.org/files/2022/02/3984417/Neg_pulse_study_2_18_22.pdf.
Also please take the time to look over all the plots in my log entry,
https://logbooks.jlab.org/entry/3984417. I try my best to pick some event
examples to show, but I encourage everyone to scroll through the event
displays I have posted, to get an idea of what the negative pulses look
like. Please let me know your thoughts and questions.

Best,
Sean
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