sPHENIX tracking discussion

["Frawley, Anthony" <afrawley AT fsu.edu>]

Hello All,

Here are the notes from today's tracking meeting.

Best regards

Tony

Tracking meeting May 26, 2017:
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The agenda page is:
https://indico.bnl.gov/conferenceDisplay.py?confId=3193

I showed some plots comparing performance for 100 pion events with 100 pion + central Hijing events. The results look very good. There is still room for improvement in the single track efficiency (91% for 100 pion events, 80% for central Hijing embedded), but there is very little momentum and dca2d resolution degradation in the high occupancy events. The central Hijing events with 100 embedded pions take about 10 minutes, including about 5 minutes for the simulation. Congratulations to Haiwang and to Christof, this is tremendous progress! Special thanks to Haiwang for his tremendous effort leading up to this.

The evaluator output files for these performance plots are located in the following directories. Note that the embedded files contain only embedded pion tracks:

/sphenix/user/frawley/QTG_simulations/macros/macros/g4simulations/
  bugfix_100pion_eval_output/
  bugfix_hijing_embedded_100pion_eval_output/

We discussed our goals for the immediate future.

Haiwang and Christof will look into improving the tracking efficiency.
Otherwise, we should focus on generating performance plots and documenting what goes into them.
We should study fake track rates, reviewers would want to see that.
Christof requested cluster resolution plots extracted from the embedded files, for use as input to toy model estimates of performance.
One plot that will be needed is mass resolution for Upsilons embedded in central Hijing (we now see 84 MeV for single Upsilons).
We should check performance with the hits files that Chris generated. If it is good, we should use those.
Haiwang will modify the tracking to allow us to drop the maps layers to check performance for Upsilons and light quark jets.
Jin will talk with me offline about setting up documentation in a git repository.

Longer term (i.e. by the time of the tracking software workfest at BNL) we should also be thinking about proper event vertexing. Currently we are using the truth vertex smeared by 100 microns. This is expected to be pessimistic, and should improve with the implementation of event vertexing.

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From: Frawley, Anthony
Sent: Friday, May 26, 2017 12:38 AM
To: sphenix-tracking-l AT lists.bnl.gov
Cc: Frawley, Anthony
Subject: Re: Tracking meeting Friday May 26 at 9:00 am EDT

 

Hi All,

Here is the agenda page for the meeting:

https://indico.bnl.gov/conferenceDisplay.py?confId=3193

sPHENIX tracking meeting (26 May 2017) indico.bnl.gov To join the Meeting: https://bluejeans.com/822435626 To join via Browser: https://bluejeans.com/822435626/browser To join with Lync: https://bluejeans.com/822435626/lync To join via Cisco Jabber Video: https://bluejeans.com/822435626/jabber To join via Room System: Video Conferencing System: bjn.vc -or- 199.48.152.152 Meeting ID: 822435626 To join via Phone: 1) Dial: +1 408 740 7256 +1 888 240 2560(US Toll Free) +1 408 317 9253(Alternate Number) (see all numbers - http://bluejeans.com/

Let me know if you want to present any slides, and I will add you as a manager.

I will post a few slides in the morning comparing 100 pion events with 100 pions embedded in central Hijing.

Cheers

Tony

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From: Frawley, Anthony
Sent: Thursday, May 25, 2017 9:45 PM
To: sphenix-tracking-l AT lists.bnl.gov
Cc: Frawley, Anthony
Subject: Tracking meeting Friday May 26 at 9:00 am EDT

 

HI All,

Sorry about the short notice, but let's have a tracking meeting tomorrow at 9:00 am EDT to discuss where we stand and what we should do next. I just ran 1000 Hijing events with 100 pions each using the code containing Haiwang's bug fix from yesterday, and I will have a couple of slides to show. But mostly I think we should just talk about the status and path forward.

I will post the agenda page link a little later tonight.

Thanks

Tony