sPHENIX is a new detector at RHIC.

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

Also available on agenda: https://indico.bnl.gov/conferenceDisplay.py?confId=1931

 

Repository Update:

 

Pending pull requests:

·       https://github.com/sPHENIX-Collaboration/coresoftware/pull/190: z-vertex seed for TPC tracking.

• Sourav help run cross check
• Sookhyun running further check on self-init vertexing from inner trackers.
• Chris: suggest continue using BBC as seed to determine initial vertex, even in the multiple collision cases.

·       https://github.com/sPHENIX-Collaboration/coresoftware/pull/194: reconstruction event display preview

·       https://github.com/sPHENIX-Collaboration/coresoftware/pull/195: temperature correction

·       https://github.com/sPHENIX-Collaboration/coresoftware/pull/201: adding track state for track projection to calorimeters

• John/Haiwang: pending on update from Haiwang to save path length into the track state

 

 

Uplison R_AA projection - Sasha Lebedev

 

Summary: crosschecking R_AA statistical uncertainty projection with sPHENIX proposal

 

Page 2: The concern to address: sPHENIX proposal contains better Upsilon statistics projection than last week's update.

Slide 4: error estimated using 1/Sqrt(N_AuAu)

Slide 5: error estimation in p+p

 

Discussion:

Sasha: how sPHENIX proposal R_AA estimation made?

Tony: including background in the AuAu projection.

Tony: how new background spectrum get constructed?

Sasha: using hadron embedding in AuAu in full simulation and extracted pT-dependent pion rejection factor at given electron efficiency.

Tony: what mass range was used to estimate signal/background ratio and signal count?

Sasha: integral through a window of 9.1-9.5 or 9.6 GeV/c^2.

Sasha: Another difference, in proposal eID = 70% for AuAu and eID = 90% for p+p. Now use 90% in both case as electron ID improves in recent simulations.

 

Action Item [Sasha, Tony]: suggest cross check the signal/background spectrum and mass window between sPHENIX proposal and Sasha’s updated simulation.

Tony/Jin: suggest use crystal ball to extract yield with max efficiency use of data.

John: important to sort it out and archive macros, results, as Upsilon is one leading program in detector designing

 

 

GenFit2 on Ladders - Haiwang Yu

 

Summary: first try out GenFit2 Kalman filter to fit MAPS detectors in ladder geometry

 

Slide 2:

Jin: why need tilt hardcoded?

Tony: should not be hard coded. Expect in geometry class.

 

Slide 4: new code has better resolution but worse linearity (comparing new fit without recalibrator with default fit with recalbratator)

Tony: was consistent field map used in the new fit?

Haiwang: need to double check

Jin: another source of non-linearity at high momentum could be the assignment of cluster center is off, upstream from the Kalman fit.

 

Tony: was the fit considered the material distribution in the ladders

Haiwang: yes.

 

Action Item [Haiwang, Tony]: fetch tilt from geometry class stored on DST. Make such interface if the geometry interface not already support it.

Action Item [Haiwang]: Double check the origin of non-linearity in pT from GenFit results: 1) whether magnetic field map is consist between simulation and fit. 2) whether the cluster center is properly assigned by running fast simulation with cluster built from smearing truth hit location.

Action Item [Haiwang]: check DCA reconstruction quality which is more sensitive to realistic material distribution

 

 

______________________________

 

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, October 17, 2016 11:47 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 Oct 18th, 1PM EST @ 2-219

 

Hello everyone,

 

This is a reminder for a regular sPHENIX simulation and software meeting, Tue Oct 18th, 1PM EST @ 2-219

 

Currently on agenda are:

·       Upsilon R_AA - Sasha Lebedev

·       GenFit2 with Silicon Ladders  - 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=1932     , 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)

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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

______________________________