sPHENIX discussion of software

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

Dear Jin,

I have posted a few additional slides to the indico page showing some comparisons of ladder vs cylinder maps plots made using the github default setup for the cylinder maps, and the ladder maps setup in:

https://github.com/adfrawley/coresoftware/tree/ITS_MAPS_development/simulation/g4simulation

https://github.com/adfrawley/macros/tree/ITS_MAPS_development/macros/g4simulations

The slides (MAPS_ladder_crosschecks.pdf)) are at:

https://indico.bnl.gov/materialDisplay.py?contribId=4&materialId=slides&confId=1921

Best regards

Tony

---

From: sphenix-l-bounces AT lists.bnl.gov <sphenix-l-bounces AT lists.bnl.gov> on behalf of Huang, Jin <jhuang AT bnl.gov>
Sent: Tuesday, August 2, 2016 6:56 PM
To: sphenix-l AT lists.bnl.gov; sphenix-software-l AT lists.bnl.gov
Subject: [Sphenix-l] [minutes] sPHENIX simulation and software meeting, Tue Aug 2nd, 1PM EST @ 2-219

 

Also available on agenda: https://indico.bnl.gov/conferenceDisplay.py?confId=1921

 

Software updates

 

Recently pull requests:

·       Mike: TPC cluster error handling in tracking software

o   https://github.com/sPHENIX-Collaboration/coresoftware/pull/187

·       Jin: Support embedding into production HIJING DST in the default macro

o   https://github.com/sPHENIX-Collaboration/macros/pull/33

·       Nils: towards merging EIC detector simulation into main repository

o   https://github.com/sPHENIX-Collaboration/coresoftware/pull/189

o   https://github.com/sPHENIX-Collaboration/coresoftware/pull/188

o   https://github.com/sPHENIX-Collaboration/macros/pull/34 (open, in preview)

·       Sookhyun: improving handling of vertex in MAPS+TPC simulations. Open pull request, Request cross check before merging

o   https://github.com/sPHENIX-Collaboration/coresoftware/pull/190

 

 

Laddered MAPS + TPC - Tony Frawley

 

Summary: on the path to implement realistic ladder simulation for MAPS, first tests of MAPS in ladder + TPC were performed. Upsilon mass resolution of 77 MeV were observed in the first try. Revealed threshold-related efficiency issue in digitization & clustering

 

Slide 5: threshold-related efficiency issue in digitization & clustering, which affect both cylindrical MAPS tracker and laddered ones

Jin: how the expected MIP energy threshold were calculated

Tony: from dE/dx calculation

Marzia: loss of efficiency can be from the fluctuation of energy deposition in very thin silicon layers.

Jin: we can histogram edep in Geant4 hit to illustrate the fluctuation in ionization energy deposition

Tony: plan to do so

 

Slide 6:

John: the MPAs thickness is not 50um?

Tony: active layer within the silicon is 18um in the detector model

 

Slide 7:

Upsilon mass resolution of 77 MeV were observed, which is worse than the simple cylindrical model. Improvement require update in tracking software which only handle one-hit per layer right now.

 

Plan:

Tony: close to ready for merging code. Plan to test DCA and purity, and double check any interference with default cylindrical tracking.

 

  

Electron and pion identification - Marzia Rosati

 

Summary: testing electron/pion separation for Upsilon ID in large kinematic space. e-ID in single particle simulation is shown.

 

Slide 2:

Marzia: Spacal 2D option is used in this simulation.

 

Slide 3:

Mariza: using cluster energy from evaluator with variable cemce 

Jin: the current cauterizer is likely to pick up large cluster as it joints adjacent non-zero suppressed towers. It also builds larger cluster for pions when it develops hadronic showers.

 

Slide 4:

Marzia: plan to use constant momentum rather than constant pT as detector performance scale with momentum

 

Plan & discussion:

Marzia: repeat simulation with constant momentum and use hijing embedding. Plan to produce new Upsilon background with momentum dependence

Jin: suggest use CEMC3x3 in the evaluator, which is a tracking-projection based 3x3 clusterizer. It can handle HIJING simulation too.

Jin: central production for embedding is possible by requests

 

 

Secondary vertex finding in jet - Sanghoon Lim

 

Summary: first test of sPHENIX b-jet tagging using secondary vertex found in jet. Event cut was also shown as alternative method to enrich event with b-jet production.

 

Slide 2:

Sanghoon: Ideal ITS maps tracker used.

Sanghoon: some tracks with large DCA still included in primary vertex finding (after outlier rejection in vertex finding)

 

Slide 3: b-jet tagging with vertex in jet

Jin: Suggest trace down few light-quark jet events with displaced vertex. Some may due to the V0 decay in light jet events and can be further reduced using a max-vertex-distance cut.

Jin: y-axis use 1/(1-rejection) as the operating point has rejection few thousands to one.

 

Slide 4: event vertex cut used to enrich b-jet event fraction

 

Plan:

Sanghoon: Multi-vertex cuts following CMS method.

Jin: also suggest test the reference sPHENIX tracker design, which leads to performance plot for tracking review

 

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

From: Huang, Jin
Sent: Monday, August 1, 2016 11:08 AM
To: 'sphenix-l AT lists.bnl.gov' <sphenix-l AT lists.bnl.gov>; 'sphenix-software-l AT lists.bnl.gov' <sphenix-software-l AT lists.bnl.gov>
Subject: [reminder] sPHENIX simulation and software meeting, Tue Aug 2nd, 1PM EST @ 2-219

 

Hello everyone,

 

This is a reminder for a regular sPHENIX simulation and software meeting, Tue Aug 2nd, 1PM EST @ 2-219.

 

This week, we plan to start with updates from two physics topical groups:

·       Upsilon spectroscopy TG: electron/pion simulations by Marzia

·       HF Jet TG: First displaced vertex tagging in jet by Sanghoon

More contributions are welcomed too

 

The agenda page is at https://indico.bnl.gov/conferenceDisplay.py?confId=1921   , for which the common modification password is "1008"

•            For residents at BNL, we will meet at the 2-219 conference room this time

•            To join the Meeting via phone bridge:  https://bluejeans.com/619960505 

•            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/numbers)

2) Enter Conference ID: 619960505

 

Cheers,

 

Jin

 

 

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________