sPHENIX discussion of software

["Huang, Jin" <jhuang AT bnl.gov>]

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

______________________________