sPHENIX discussion of software

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

Also available on agenda: https://indico.bnl.gov/conferenceDisplay.py?confId=1934

 

 

Upsilon background update - Sasha Lebedev

 

Summary: cross check with proposal for Upsilon and background by using same approximation of hadron rejection. New study expect lower background at 70% eff. Explore 90% electron eff. option too.

 

Slide 2: slightly binning may be used than proposal.

 

Slide 3: after apply pT-dependent pion rejection factor, it appears improved hadron background @ 70% electron efficiency

 

Slide 4: investigating  background spectrum with choice of 90% electron eff.

 

Plan: expect new R_AA next week.

 

 

Check quality of tracking fit - Haiwang Yu

 

Summary: isolating the distortion in pull distribution of pT and DCA to the reconstruction of clusters

 

Dave: progress on realistic MAPS geometry.

Haiwang: back step from full geometry to investigate pull distribution problem.

Jin: Tony have the code almost ready. Need pull request to merge.

 

Slide 3: the problem trying to solve: for both default and GenFit2 Kalman fit, distortion on pull distribution is observed. Smaller effect for GenFit2.

 

Slide 4: with ideal clustering, pull distribution for both pT and DCA_2D become nominal (mean = 0, resolution/error = 1), suggesting the problem on slide3 originate from cluster biases

 

Slide 5: correcting for the radial location of the reconstructed cluster did not solve the problem on slide 3.

 

Slide 6: further check cluster pull distribution. Still checking.

Jin: suggest further check these variables before drawing conclusions on clusterizer quality.

 

Discussion:

Dave: What’s the origin of the TPC clusterizer code?

Jin: built upon PHG4CylindricalCell with a reconstruction chain of PHG4CylinderCellTPCReco -> PHG4TPCClusterizer

 

 

General comments

 

Chris: we should look into fast sPHENIX simulation model using scheme like EIC Smear package (fast simulation with detector smearing), which could be a good starting point.

Action Item [volunteer needed]: fast simulation for sPHENIX observables without the Geant4 stages (tracks, calorimeter clusters, jets).

 

 

______________________________

 

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, October 31, 2016 11:20 AM
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: [reminder] sPHENIX simulation and software meeting, Tue Nov 1st, 1PM EST @ 2-219

 

Hello everyone,

 

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

 

Currently on agenda is:

•            Tracking fit quality checks - Haiwang Yu

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

 

The agenda page is at https://indico.bnl.gov/conferenceDisplay.py?confId=1934   , 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

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________