sPHENIX is a new detector at RHIC.

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

Minutes also available on agenda page: https://indico.bnl.gov/conferenceDisplay.py?confId=1939

 

Recent repository updates

 

Use realistic geometry for silicon detector simulation:

·       Realistic MAPS geometry by Tony: https://github.com/sPHENIX-Collaboration/coresoftware/pull/218

o   Tony plan to fix a valgrind complain of variable init in digitizer

o   Mike and Jin will double check the cell ID tracing in the evaluator

·       Realistic INTT geometry by Gaku: https://github.com/sPHENIX-Collaboration/coresoftware/pull/219

o   Plan to remove unused variables

o   Plan to make dedicated digitizer

 

Sourav double checked new and nightly-built libs with the default cylindrical macros.

Gaku: observed a change in the efficiency turn on.

Sourav: may carry change in old run reference too.

Action Item [Gaku, Sourav]: revert SvtxDigitizer and test again with identical macro settings

 

 

3-D DCA - Haiwang Yu

 

Slide 2: updated definition of DCA3D_xy, and DCA3D_z. Observed smaller correlation between two DCA components with this new definition.

 

Slide 3: problem found, DCA3D_z carry double peak for pz>0 and pz<0 tracks.

 

Slide 4: use truth tracking and clustering, the problem is gone. Problem should be introduced somewhere between digitization, clustering and GenFit using the reconstructed cluster.

 

Slide 5: the bi-polar structure is a step function VS eta or cot(theta) at zero.

Cluster pull is fine in r*phi and z dimensions.

 

Suggestions:

Tony: most INTT are single hit in the cylindrical model. MAPS clustering should be straightforward. Suggest double clustering position.

Gaku: is that related to single/double precision in cluster position?

Chris: suggest check dependence of the bias VS the on cell/pixel size

 

 

______________________________

 

Jin HUANG, Ph. D.

 

Associate Physicist

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, December 5, 2016 1:00 PM
To: 'sphenix-software-l AT lists.bnl.gov' <sphenix-software-l AT lists.bnl.gov>; 'sphenix-l AT lists.bnl.gov' <sphenix-l AT lists.bnl.gov>
Subject: sPHENIX simulation and software meeting, Tue Dec 6th, 1PM EST @ 2-219

 

Hello everyone,

 

This is a reminder for a regular sPHENIX simulation and software meeting, Tue Dec 6th, 1PM EST @ 2-219

 

Currently on agenda is continue the study of last week:

•            Ladder geometry for MAPS and INTT was implemented in simulation by Tony and Gaku, which are milestones we set in the tracking planning meeting early Oct.

•            3-D DCA fitting and b-jet tagging  - Haiwang Yu

Please let us know if you have further topics to be presented at this meeting.  

 

The agenda page is at https://indico.bnl.gov/conferenceDisplay.py?confId=1939  , for which the common modification password is "1008"

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

•            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, Ph. D.

 

Associate Physicist

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________