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<div class="">Sean,</div>
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<div class="">Yes, that 20 cm cut definitely shouldn't be there at the skim level. We can't calibrate the blocks if they don't enter the skim! I suppose this a relic from Adesh's code. At one point he was just looking for clean pi0's and such a cut was helpful
to reduce background. I hadn't realized that it had propagate all the way the to plugin that does skimming for gain calibration. Wish we would have discovered this earlier.</div>
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<div class="">There is still some funny correlation with occupancy and clusters. Ilia's cluster seeds are a little higher than what we are using, but likely this is a second order effect and our biggest problem is just the cuts on the skim. </div>
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<div class="">Matt</div>
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<blockquote type="cite" class="">
<div class="">On Nov 17, 2018, at 11:30 PM, Sean Dobbs <<a href="mailto:sdobbs@fsu.edu" class="">sdobbs@fsu.edu</a>> wrote:</div>
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<div dir="ltr" class="">Hi all,
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I took another look at the current definitions of the FCAL pi0 skim. They are:</div>
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<div class="">- Pair together two FCAL showers which are not matched to tracks (given some track quality criteria) with E > 500 MeV, and r > 20 cm</div>
<div class="">- The difference between the shower times must be < 10 ns</div>
<div class="">- M(gg) < 300 MeV</div>
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<div class="">I think the 20 cm radial cut would suppress the number of showers in the inner rings?</div>
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<div class="">In either case, it would be good to know if the inner ring pi0 showers Ilya is seeing satisfy these criteria, or which ones are not satisfied.</div>
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<div class="">Cheers,<br class="">
Sean</div>
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<div dir="ltr" class="">On Sat, Nov 17, 2018 at 10:48 PM Ilia Larin <<a href="mailto:ilarin@jlab.org" class="">ilarin@jlab.org</a>> wrote:<br class="">
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<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br class="">
Hi Colin,<br class="">
<br class="">
I checked that skim file.<br class="">
I see nothing at all in the most inner FCAL layer,<br class="">
and highly suppressed statistics for 2nd and 3rd FCAL inner layers.<br class="">
<br class="">
Ilya<br class="">
<br class="">
----- Original Message -----<br class="">
From: "Colin Gleason" <<a href="mailto:gleasonc609@gmail.com" target="_blank" class="">gleasonc609@gmail.com</a>><br class="">
To: "Ilya Larin" <<a href="mailto:ilarin@jlab.org" target="_blank" class="">ilarin@jlab.org</a>><br class="">
Sent: Friday, November 16, 2018 5:22:10 PM<br class="">
Subject: fcal pi0 skim<br class="">
<br class="">
Ilya,<br class="">
<br class="">
Here is the location of the pi0 skim:<br class="">
<br class="">
/cache/halld/RunPeriod-2018-08/calib/ver01/FCAL_pi0/Run050930/hd_rawdata_050930_000.pi0fcalskim.evio<br class="">
<br class="">
We only skim over 10% of the run due to computation limits, so there should<br class="">
be around 30 files in the directory. I think 1 run should be enough to see<br class="">
and compare pi0s. Iff we need more, we can use up to 10 files. If you run<br class="">
with -PNTHREADS=4, then it should take 1-2 minutes to run interactively.<br class="">
If you still see pi0s, then you can probably use these skims to save time.<br class="">
-- <br class="">
Colin Gleason<br class="">
Postdoctoral Fellow<br class="">
Indiana University<br class="">
Department of Physics<br class="">
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