[Primexd] fcal pi0 skim

[Sean Dobbs]

Matt,

Yes, these historical things slip in under the radar some times.  I'll remove these cuts and produce some files to look at.

---Sean

On Sun, Nov 18, 2018 at 9:42 AM Shepherd, Matthew <mashephe at indiana.edu<mailto:mashephe at indiana.edu>> wrote:

Sean,

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.

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.

Matt


On Nov 17, 2018, at 11:30 PM, Sean Dobbs <sdobbs at fsu.edu<mailto:sdobbs at fsu.edu>> wrote:

Hi all,

I took another look at the current definitions of the FCAL pi0 skim.  They are:

- Pair together two FCAL showers which are not matched to tracks (given some track quality criteria) with E > 500 MeV, and r > 20 cm
- The difference between the shower times must be < 10 ns
- M(gg) < 300 MeV

I think the 20 cm radial cut would suppress the number of showers in the inner rings?

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.

Cheers,
Sean

On Sat, Nov 17, 2018 at 10:48 PM Ilia Larin <ilarin at jlab.org<mailto:ilarin at jlab.org>> wrote:

 Hi Colin,

I checked that skim file.
I see nothing at all in the most inner FCAL layer,
and highly suppressed statistics for 2nd and 3rd FCAL inner layers.

 Ilya

----- Original Message -----
From: "Colin Gleason" <gleasonc609 at gmail.com<mailto:gleasonc609 at gmail.com>>
To: "Ilya Larin" <ilarin at jlab.org<mailto:ilarin at jlab.org>>
Sent: Friday, November 16, 2018 5:22:10 PM
Subject: fcal pi0 skim

Ilya,

Here is the location of the pi0 skim:

/cache/halld/RunPeriod-2018-08/calib/ver01/FCAL_pi0/Run050930/hd_rawdata_050930_000.pi0fcalskim.evio

We only skim over 10% of the run due to computation limits, so there should
be around 30 files in the directory. I think 1 run should be enough to see
and compare pi0s. Iff we need more, we can use up to 10 files. If you run
with  -PNTHREADS=4, then it should take 1-2 minutes to run interactively.
If you still see pi0s, then you can probably use these skims to save time.
--
Colin Gleason
Postdoctoral Fellow
Indiana University
Department of Physics
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